{"id":4734,"date":"2021-11-12T13:46:56","date_gmt":"2021-11-12T06:46:56","guid":{"rendered":"https:\/\/www.ptclinearmotion.com\/?p=4734"},"modified":"2022-07-25T11:18:24","modified_gmt":"2022-07-25T04:18:24","slug":"nsk-new-bearing-doctor","status":"publish","type":"post","link":"https:\/\/www.ptclinearmotion.com\/en\/nsk-new-bearing-doctor\/","title":{"rendered":"NSK New Bearing Doctor"},"content":{"rendered":"<h2><strong>NSK New Bearing Doctor<\/strong><\/h2>\n<hr \/>\n<p>When a rolling bearing is damaged during machine operation, the entire machine or equipment may seize or malfunction. Since bearings that fail prematurely or unexpectedly cause trouble, it is important to be able to identify and predict failure beforehand, if possible, so that preventive measures can be adopted.<\/p>\n<p>\u00a0<\/p>\n<p>This pamphlet contains explanations about correct bearing handling, mounting, lubrication, and maintenance to prevent premature failure together with color photos of bearing failures. Most premature bearing failures can be avoided. Causes include improper mounting, mishandling, poor lubrication, entry of foreign particles\/contamination and abnormal heat generation.<\/p>\n<p>If all conditions are known both before and after the failure, including the application, operating conditions and the environment, then a countermeasure can be determined by studying the nature of the failure and its probable causes.<\/p>\n<div class=\"row\"  id=\"row-1361659099\">\n\n\t<div id=\"col-1196633008\" class=\"col medium-3 small-12 large-3\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1085334304\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1786524993\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"289\" height=\"216\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2021\/11\/bearing-doctor-pic.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1786524993 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1259598041\" class=\"col medium-3 small-12 large-3\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<p>In general, if rolling bearings are used correctly, they will survive to their predicted fatigue life. Bearings, however, often fail prematurely due to avoidable mistakes. In contrast to fatigue life, this premature failure is caused by improper mounting, mishandling, poor lubrication, entry of foreign matter or abnormal heat generation.<\/p>\n<p>If all conditions are known for the times both before and after the failure, including the application, the<\/p>\n<p>operating conditions, and environment, then a measure can be determined by studying the nature of the failure and its probable causes. A successful measure will reduce similar failures or prevent them from happening again.<\/p>\n<div class=\"row\"  id=\"row-1281914547\">\n\n\t<div id=\"col-2105920055\" class=\"col medium-4 small-12 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1515206499\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"628\" height=\"558\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-1.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-1.jpg 628w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-1-450x400.jpg 450w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-1-600x533.jpg 600w\" sizes=\"(max-width: 628px) 100vw, 628px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1515206499 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1741601936\" class=\"col medium-4 small-12 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_784542193\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"526\" height=\"487\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-2.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-2.jpg 526w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-2-432x400.jpg 432w\" sizes=\"(max-width: 526px) 100vw, 526px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_784542193 {\n  width: 97%;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1011237266\" class=\"col medium-4 small-12 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_964454203\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"581\" height=\"558\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-3.png\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-3.png 581w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-3-416x400.png 416w\" sizes=\"(max-width: 581px) 100vw, 581px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_964454203 {\n  width: 95%;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<h3>Bearing Damage and Countermeasures: Flaking<\/h3>\n<div class=\"row\"  id=\"row-822777731\">\n\n\t<div id=\"col-1746005276\" class=\"col small-12 large-12\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"row row-collapse row-full-width\"  id=\"row-1336662125\">\n\n\t<div id=\"col-1505155101\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><b>Damage Cond<\/b><\/p>\n<p>Flaking occurs when small pieces of bearing material are split off from the smooth surface of the raceway or rolling elements due to rolling fatigue, thereby creating regions having rough and coarse texture.<\/p>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-2143416454\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><b>Possible Cause<\/b><\/p>\n<ul>\n<li>Excessive load<\/li>\n<li>Poor mounting (misalignment)<\/li>\n<li>Moment load<\/li>\n<li>Entry of foreign debris, water penetration<\/li>\n<li>Poor lubrication, Improper lubricant<\/li>\n<li>Unsuitable bearing clearance<\/li>\n<li>Improper precision for shaft or housing, unevenness in housing rigidity, large shaft bending<\/li>\n<li>Progression from rust, corrosion pits, smearing,dents (Brinelling)<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1692241907\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><b>Countermeasure\u00a0<\/b><\/p>\n<ul>\n<li>Reconfirm the bearing application and check the load conditions<\/li>\n<li>Improve the mounting method<\/li>\n<li>Improve the sealing mechanism, prevent rusting during non-running<\/li>\n<li>Use a lubricant with a proper viscosity, improve the lubrication method<\/li>\n<li>Check the precision of shaft and housing<\/li>\n<li>Check the bearing internal clearance<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-671700\">\n\n\t<div id=\"col-1154566807\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_233450222\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"346\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-4.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_233450222 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-252451145\" class=\"text\">\n\t\t\n<p><span style=\"font-size: 75%;\"><i>Part: Inner ring of an angular contact ball bearing<br \/><\/i><\/span><span style=\"font-size: 75%;\"><i>Symptom: Flaking occurs around half of the circumference of the raceway surface<br \/><\/i><\/span><span style=\"font-size: 75%;\"><i>Cause: Poor lubrication due to entry of cutting coolant into bearing<\/i><\/span><\/p>\n\t\t\n<style>\n#text-252451145 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1806406493\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1526521750\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"345\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-5.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1526521750 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-2639408277\" class=\"text\">\n\t\t\n<p><span style=\"font-size: 75%;\"><i>Part: Inner ring of an angular contact ball bearing<br \/><\/i><\/span><span style=\"font-size: 75%;\"><i>Symptom: Flaking occurs diagonally along raceway<br \/><\/i><\/span><span style=\"font-size: 75%;\"><i>Cause: Poor alignment between shaft and housing during mounting<\/i><\/span><\/p>\n\t\t\n<style>\n#text-2639408277 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<h3>Bearing Damage and Countermeasures: Flaking<\/h3>\n<div class=\"row\"  id=\"row-681384807\">\n\n\t<div id=\"col-200654116\" class=\"col medium-4 small-12 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1187309193\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"346\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-6.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1187309193 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-3147637448\" class=\"text\">\n\t\t\n<p><span style=\"font-size: 75%;\"><i>Part: Balls\u00a0<br \/><\/i><i>Symptom: Flaking of ball surface\u00a0<br \/><\/i><i>Cause: Dents due to shock load while stationary<\/i><\/span><\/p>\n\t\t\n<style>\n#text-3147637448 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-704806946\" class=\"col medium-4 small-12 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_308164004\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"345\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-7.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_308164004 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-161144576\" class=\"text\">\n\t\t\n<p><em><span style=\"font-size: 75%;\">Part: Outer ring <\/span><\/em><br \/><em><span style=\"font-size: 75%;\">Symptom: Flaking of raceway surface at ball pitch<\/span><\/em><br \/><em><span style=\"font-size: 75%;\">Cause: Dents due to shock load while stationary<\/span><\/em><\/p>\n\t\t\n<style>\n#text-161144576 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-370637199\" class=\"col medium-4 small-12 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_2019146169\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"345\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-8.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_2019146169 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-8449725\" class=\"text\">\n\t\t\n<p><span style=\"font-size: 75%;\"><em>Part: Rollers of a cylindrical roller bearing<\/em><\/span><br \/><span style=\"font-size: 75%;\"><em>Symptom: Premature flaking occurs axially on the rolling surfaces<\/em><\/span><br \/><span style=\"font-size: 75%;\"><em>Cause: Scratches caused during improper mounting<\/em><\/span><\/p>\n\t\t\n<style>\n#text-8449725 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-1205661543\">\n\n\t<div id=\"col-597298017\" class=\"col small-12 large-12\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<h3><strong>Bearing Damage and Countermeasures: Flaking<\/strong><\/h3>\n<p>\u00a0<\/p>\n<div class=\"row row-collapse row-full-width\"  id=\"row-1385041397\">\n\n\t<div id=\"col-1039299730\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Damage Condition<\/strong><\/p>\n<p>Flaking occurs when small pieces of bearing material are split off from the smooth surface of the raceway or rolling elements due to rolling fatigue, thereby creating regions having rough and coarse texture.<\/p>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1864847545\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Possible Cause<\/strong><\/p>\n<ul>\n<li>Excessive load<\/li>\n<li>Poor mounting (misalignment)<\/li>\n<li>Moment load<\/li>\n<li>Entry of foreign debris, water penetration<\/li>\n<li>Poor lubrication, Improper lubricant<\/li>\n<li>Unsuitable bearing clearance<\/li>\n<li>Improper precision for shaft or housing, unevenness<br \/>in housing rigidity, large shaft bending<\/li>\n<li>Progression from rust, corrosion pits, smearing,<br \/>dents (Brinelling)<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-784376209\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Countermeasure<\/strong><\/p>\n<ul>\n<li>Reconfirm the bearing application and check the load conditions<\/li>\n<li>Improve the mounting method<\/li>\n<li>Improve the sealing mechanism, prevent rusting during non-running<\/li>\n<li>Use a lubricant with a proper viscosity, improve the lubrication method<\/li>\n<li>Check the precision of shaft and housing<\/li>\n<li>Check the bearing internal clearance<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_762087550\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"1020\" height=\"299\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-9-1400x411.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-9-1400x411.jpg 1400w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-9-800x235.jpg 800w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-9-768x225.jpg 768w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-9-600x176.jpg 600w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-9.jpg 1534w\" sizes=\"(max-width: 1020px) 100vw, 1020px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_762087550 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-2013064364\" class=\"text\">\n\t\t\n<p><span style=\"font-size: 75%;\"><i>Part: Inner ring of a spherical roller bearing<br \/><\/i><\/span><span style=\"font-size: 75%;\"><i>Symptom: Round shaped peeling pattern occurs on the<br \/><\/i><\/span><span style=\"font-size: 75%;\"><i>center of the raceway surface\u00a0<br \/><\/i><\/span><span style=\"font-size: 75%;\"><i>Cause: Poor lubrication<\/i><\/span><\/p>\n\t\t\n<style>\n#text-2013064364 {\n  line-height: 0.75;\n  text-align: center;\n}\n<\/style>\n\t<\/div>\n\t\n<h3><strong>Bearing Damage and Countermeasures: Peeling<\/strong><\/h3>\n<div class=\"row\"  id=\"row-1024120550\">\n\n\t<div id=\"col-1863002109\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1807011492\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"346\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-10.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1807011492 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-2660015000\" class=\"text\">\n\t\t\n<p><span style=\"font-size: 75%;\"><i>Part: Convex rollers\u00a0<br \/><\/i><i>Symptom: Round shaped peeling pattern occurs on the center\u00a0<\/i><i>of the rolling surfaces\u00a0<br \/><\/i><i>Cause: Poor lubrication<\/i><\/span><\/p>\n\t\t\n<style>\n#text-2660015000 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-59415194\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1716727275\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"346\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-11.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1716727275 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-3094988809\" class=\"text\">\n\t\t\n<p><span style=\"font-size: 75%;\"><i>Part: Outer ring of a spherical roller bearing\u00a0<br \/><\/i><i>Symptom: Peeling occurs near the shoulder of the raceway over\u00a0<\/i><i>the entire circumference\u00a0<br \/><\/i><i>Cause: Poor lubrication<\/i><\/span><\/p>\n\t\t\n<style>\n#text-3094988809 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<h3><strong>Bearing Damage and Countermeasures: Scoring<\/strong><\/h3>\n<div class=\"row row-collapse row-full-width\"  id=\"row-365044341\">\n\n\t<div id=\"col-1917246712\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Damage Condition<\/strong><\/p>\n<p><span style=\"font-size: 110%;\">Scoring is surface damage due to accumulated <\/span><span style=\"font-size: 110%;\">small seizures caused by sliding under improper <\/span><span style=\"font-size: 110%;\">lubrication or under severe operating conditions. <\/span><span style=\"font-size: 110%;\">Linear damage appears circumferentially on the <\/span><span style=\"font-size: 110%;\">raceway surface and rolling surface. <\/span><span style=\"font-size: 110%;\">Cycloidal shaped damage on the roller end. <\/span><span style=\"font-size: 110%;\">Scoring on rib surface contacting roller end.<\/span><\/p>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-471015528\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Possible Cause<\/strong><\/p>\n<ul>\n<li>Excessive load, excessive preload<\/li>\n<li>Poor lubrication<\/li>\n<li>Particles are caught in the surface<\/li>\n<li>Inclination of inner and outer rings<\/li>\n<li>Shaft bending<\/li>\n<li>Poor precision of the shaft and housing<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-883285071\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Countermeasure<\/strong><\/p>\n<ul>\n<li>Check the size of the load<\/li>\n<li>Adjust the preload<\/li>\n<li>Improve the lubricant and the lubrication method<\/li>\n<li>Check the precision of the shaft and housing<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-999293784\">\n\n\t<div id=\"col-1381361040\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_896584325\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"345\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-12.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_896584325 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-3424178763\" class=\"text\">\n\t\t\n<p><span style=\"font-size: 75%;\"><i>Part: Inner ring of a spherical roller bearing\u00a0<br \/><\/i><i>Symptom: Scoring on large rib face of inner ring\u00a0<br \/><\/i><i>Cause: Roller slipping due to sudden acceleration and deceleration<\/i><\/span><\/p>\n\t\t\n<style>\n#text-3424178763 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1081212344\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_153282713\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"345\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-13.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_153282713 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-2086175511\" class=\"text\">\n\t\t\n<p><span style=\"font-size: 75%;\"><i>Part: Convex rollers\u00a0<br \/><\/i><\/span><span style=\"font-size: 75%;\"><i>Symptom: Scoring on roller end face\u00a0<br \/><\/i><\/span><span style=\"font-size: 75%;\"><i>Cause: Roller slipping due to sudden acceleration and deceleration<\/i><\/span><\/p>\n\t\t\n<style>\n#text-2086175511 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-27473549\">\n\n\t<div id=\"col-1905962192\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_107325551\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"346\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-14.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_107325551 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-538280603\" class=\"text\">\n\t\t\n<p><span style=\"font-size: 75%;\"><i>Part: Cage of a deep groove ball bearing\u00a0<br \/><\/i><\/span><span style=\"font-size: 75%;\"><i>Symptom: Scoring on the pressed-steel cage pockets\u00a0<br \/><\/i><\/span><span style=\"font-size: 75%;\"><i>Cause: Entry of debris<\/i><\/span><\/p>\n\t\t\n<style>\n#text-538280603 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1495224475\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1513976899\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"346\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-15.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1513976899 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-4286174929\" class=\"text\">\n\t\t\n<p><em><span style=\"font-size: 75%;\">Part: Convex rollers of Photo 3.5<\/span><\/em><br \/><em><span style=\"font-size: 75%;\">Symptom: Scoring on the roller end face<\/span><\/em><br \/><em><span style=\"font-size: 75%;\">Cause: Debris, which is caught in surface, and excessive axial loading<\/span><\/em><\/p>\n\t\t\n<style>\n#text-4286174929 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<h3>Bearing Damage and Countermeasures: Scoring<\/h3>\n<div class=\"row row-collapse row-full-width\"  id=\"row-1079510668\">\n\n\t<div id=\"col-115993213\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Damage Condition<\/strong><\/p>\n<p>Scoring is surface damage due to accumulated small seizures caused by sliding under improper lubrication or under severe operating conditions. Linear damage appears circumferentially on the raceway surface and rolling surface. Cycloidal shaped damage on the roller end. Scoring on rib surface contacting roller end.<\/p>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-149201929\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Possible Cause<\/strong><\/p>\n<ul>\n<li>Excessive load, excessive preload<\/li>\n<li>Poor lubrication<\/li>\n<li>Particles are caught in the surface<\/li>\n<li>Inclination of inner and outer rings<\/li>\n<li>Shaft bending<\/li>\n<li>Poor precision of the shaft and housing<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-716297234\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Countermeasure<\/strong><\/p>\n<ul>\n<li>Check the size of the load<\/li>\n<li>Adjust the preload<\/li>\n<li>Improve the lubricant and the lubrication method<\/li>\n<li>Check the precision of the shaft and housing<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-441691057\">\n\n\t<div id=\"col-1380186483\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1553396498\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"347\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-16.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1553396498 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-1190509712\" class=\"text\">\n\t\t\n<blockquote><p><span style=\"font-size: 75%;\">Part: Outer ring <\/span><br \/><span style=\"font-size: 75%;\">Symptom: Smearing occurs circumferentially on raceway surface<\/span><br \/><span style=\"font-size: 75%;\">Cause: Roller slipping due to excessive grease filling<\/span><\/p><\/blockquote>\n\t\t\n<style>\n#text-1190509712 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-599929405\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1627873280\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"346\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-17.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1627873280 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-1799600704\" class=\"text\">\n\t\t\n<blockquote><p><span style=\"font-size: 75%;\">Part: Convex rollers <\/span><br \/><span style=\"font-size: 75%;\">Symptom: Smearing occurs at the center of the rolling surface<\/span><br \/><span style=\"font-size: 75%;\">Cause: Poor lubrication<\/span><\/p><\/blockquote>\n\t\t\n<style>\n#text-1799600704 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<h3>Bearing Damage and Countermeasures: Cracks<\/h3>\n\t<div id=\"gap-814637802\" class=\"gap-element clearfix\" style=\"display:block; height:auto;\">\n\t\t\n<style>\n#gap-814637802 {\n  padding-top: 30px;\n}\n<\/style>\n\t<\/div>\n\t\n<div class=\"row row-collapse row-full-width\"  id=\"row-1548612727\">\n\n\t<div id=\"col-1002210109\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Damage Condition<\/strong><\/p>\n<p>Cracks in the raceway ring and rolling elements. Continued use under this condition leads to larger cracks or fractures.<\/p>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-385861738\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Possible Cause<\/strong><\/p>\n<ul>\n<li>Excessive interference<\/li>\n<li>Excessive load, shock load<\/li>\n<li>Progression of flaking<\/li>\n<li>Heat generation and fretting caused by contact between mounting parts and raceway ring<\/li>\n<li>Heat generation due to creep<\/li>\n<li>Poor taper angle of tapered shaft<\/li>\n<li>Poor cylindricality of shaft<\/li>\n<li>Interference with bearing chamfer due to a large shaft corner radius<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1659017005\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Countermeasure<\/strong><\/p>\n<ul>\n<li>Correct the interference<\/li>\n<li>Check the load conditions<\/li>\n<li>Improve the mounting method<\/li>\n<li>Use an appropriate shaft shape<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-1807709385\">\n\n\t<div id=\"col-1197051703\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_956000091\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"347\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-18.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_956000091 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-3713691425\" class=\"text\">\n\t\t\n<blockquote><p><span style=\"font-size: 75%;\">Part: Outer ring of a double-row cylindrical roller bearing<\/span><br \/><span style=\"font-size: 75%;\">Symptom: Thermal cracks occur on the outer ring side face<\/span><br \/><span style=\"font-size: 75%;\">Cause: Abnormal heat generation due to contact sliding<\/span><br \/><span style=\"font-size: 75%;\">between mating part and face of outer ring<\/span><\/p><\/blockquote>\n\t\t\n<style>\n#text-3713691425 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1755888205\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_974837153\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"346\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-19.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_974837153 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-2972798563\" class=\"text\">\n\t\t\n<blockquote><p><span style=\"font-size: 75%;\">Part: Roller of a tapered roller thrust bearing<\/span><br \/><span style=\"font-size: 75%;\">Symptom: Thermal cracks occur at large end face of roller<\/span><br \/><span style=\"font-size: 75%;\">Cause: Heat generation due to sliding with the inner ring rib<\/span><br \/><span style=\"font-size: 75%;\">under poor lubrication<\/span><\/p><\/blockquote>\n\t\t\n<style>\n#text-2972798563 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<h3>Bearing Damage and Countermeasures: Pitting<\/h3>\n<div class=\"row row-collapse row-full-width\"  id=\"row-685979933\">\n\n\t<div id=\"col-1378398508\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Damage Condition<\/strong><\/p>\n<p>The pitted surface has a dull luster which appears on the rolling element surface or raceway surface.<\/p>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1635661648\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Possible Cause<\/strong><\/p>\n<ul>\n<li>Debris becomes caught in the lubricant<\/li>\n<li>Exposure to moisture in the atmosphere<\/li>\n<li>Poor lubrication<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-165785375\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Countermeasure<\/strong><\/p>\n<ul>\n<li>Improve the sealing mechanism<\/li>\n<li>Filter the lubrication oil thoroughly<\/li>\n<li>Use a proper lubricant<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-985399912\">\n\n\t<div id=\"col-1914735033\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_659597899\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"350\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-20.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_659597899 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-1941421008\" class=\"text\">\n\t\t\n<blockquote><p><span style=\"font-size: 75%;\">\u203a Improve the sealing mechanism<\/span><br \/><span style=\"font-size: 75%;\">\u203a Filter the lubrication oil thoroughly<\/span><br \/><span style=\"font-size: 75%;\">\u203a Use a proper lubricant<\/span><\/p><\/blockquote>\n\t\t\n<style>\n#text-1941421008 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1086579706\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_111683828\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"559\" height=\"346\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-21.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_111683828 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-366184313\" class=\"text\">\n\t\t\n<blockquote><p><span style=\"font-size: 75%;\">Part: Ball<\/span><br \/><span style=\"font-size: 75%;\">Symptom: Pitting occurs on the rolling element surface<\/span><\/p><\/blockquote>\n\t\t\n<style>\n#text-366184313 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<h3>Bearing Damage and Countermeasures: Wear<\/h3>\n<div class=\"row\"  id=\"row-34048003\">\n\n\t<div id=\"col-141194425\" class=\"col small-12 large-12\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<div class=\"row row-collapse row-full-width\"  id=\"row-488827529\">\n\n\t<div id=\"col-1469410007\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Damage Condition<\/strong><\/p>\n<div>xWear is surface deterioration due to sliding friction\u00a0at the surface of the raceway, rolling elements,\u00a0roller end faces, rib face, cage pockets, etc.<\/div>\n<div>\u00a0<\/div>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1500574274\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Possible Cause<\/strong><\/p>\n<ul>\n<li>Entry of debris<\/li>\n<li>Progression from rust and electrical corrosion<\/li>\n<li>Poor lubrication<\/li>\n<li>Sliding due to irregular motion of rolling elements<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1599272996\" class=\"col medium-4 large-4\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong>Countermeasure<\/strong><\/p>\n<ul>\n<li>Improve the sealing mechanism<\/li>\n<li>Clean the housing<\/li>\n<li>Filter the lubrication oil thoroughly<\/li>\n<li>Check the lubricant and lubrication method<\/li>\n<li>Prevent misalignment<\/li>\n<\/ul>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<div class=\"row\"  id=\"row-141928566\">\n\n\t<div id=\"col-1249334491\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_874247888\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"558\" height=\"348\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-22.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_874247888 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-296526260\" class=\"text\">\n\t\t\n<blockquote><p><span style=\"font-size: 75%;\">Part: Outer ring of a spherical roller bearing<\/span><br \/><span style=\"font-size: 75%;\">Symptom: Wear having a wavy or concave-and-convex texture on loaded<\/span><br \/><span style=\"font-size: 75%;\">side of raceway surface<\/span><br \/><span style=\"font-size: 75%;\">Cause: Entry of debris under repeated vibration while stationary<\/span><\/p><\/blockquote>\n\t\t\n<style>\n#text-296526260 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-794347747\" class=\"col medium-6 small-12 large-6\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_362411373\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"548\" height=\"337\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-23.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_362411373 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t<div id=\"text-2289514273\" class=\"text\">\n\t\t\n<blockquote><p><span style=\"font-size: 75%;\">Part: Tapered rollers of Photo 10.3<\/span><br \/><span style=\"font-size: 75%;\">Symptom: Stepped wear on the roller head and face<\/span><br \/><span style=\"font-size: 75%;\">Cause: Fretting progression due to excessive load while stationary<\/span><\/p><\/blockquote>\n\t\t\n<style>\n#text-2289514273 {\n  line-height: 0.75;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<h3>Typical running traces of deep groove ball bearings<\/h3>\n<div class=\"row\"  id=\"row-137486641\">\n\n\t<div id=\"col-36788750\" class=\"col small-12 large-12\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_614785408\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"1020\" height=\"682\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-24-1196x800.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-24-1196x800.jpg 1196w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-24-598x400.jpg 598w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-24-768x514.jpg 768w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-24-600x401.jpg 600w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-24.jpg 1280w\" sizes=\"(max-width: 1020px) 100vw, 1020px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_614785408 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n<h3>Typical running traces on roller bearings<\/h3>\n<div class=\"row\"  id=\"row-522188587\">\n\n\t<div id=\"col-324874984\" class=\"col small-12 large-12\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n\t<div class=\"img has-hover x md-x lg-x y md-y lg-y\" id=\"image_1506110495\">\n\t\t\t\t\t\t\t\t<div class=\"img-inner dark\" >\n\t\t\t<img width=\"1020\" height=\"383\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-25.jpg\" class=\"attachment-large size-large\" alt=\"\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-25.jpg 1224w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-25-800x301.jpg 800w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-25-768x289.jpg 768w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/07\/NSK-New-Bearing-Doctor-25-600x225.jpg 600w\" sizes=\"(max-width: 1020px) 100vw, 1020px\" \/>\t\t\t\t\t\t\n\t\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\n<style>\n#image_1506110495 {\n  width: 100%;\n}\n<\/style>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>NSK New Bearing Doctor When a rolling bearing is damaged during machine operation, the entire machine or equipment may seize or malfunction. Since bearings that fail prematurely or unexpectedly cause trouble, it is important to be able to identify and predict failure beforehand, if possible, so that preventive measures can be adopted. \u00a0 This pamphlet<\/p>\n","protected":false},"author":1,"featured_media":4726,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[133,132,104,92],"tags":[205],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NSK New Bearing Doctor - ptclinearmotion<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NSK New Bearing Doctor - ptclinearmotion\" \/>\n<meta property=\"og:description\" content=\"NSK New Bearing Doctor When a rolling bearing is damaged during machine operation, the entire machine or equipment may seize or malfunction. 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