{"id":5384,"date":"2022-01-06T00:32:03","date_gmt":"2022-01-05T17:32:03","guid":{"rendered":"https:\/\/www.ptclinearmotion.com\/?page_id=5384"},"modified":"2022-01-06T00:32:03","modified_gmt":"2022-01-05T17:32:03","slug":"radial-crash-2","status":"publish","type":"page","link":"https:\/\/www.ptclinearmotion.com\/en\/radial-crash-2\/","title":{"rendered":"Radial Crash"},"content":{"rendered":"\t<section class=\"section\" id=\"section_1235097097\">\n\t\t<div class=\"bg section-bg fill bg-fill  bg-loaded\" >\n\n\t\t\t\n\t\t\t\n\t\t\t\n\n\t\t<\/div>\n\n\t\t<div class=\"section-content relative\">\n\t\t\t\n<div class=\"row\"  id=\"row-431287423\">\n\n\t<div id=\"col-1645800559\" class=\"col small-12 large-12\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p style=\"text-align: center;\"><strong><span style=\"font-size: 170%;\">Radial Crash<\/span><\/strong><\/p>\n<p><span style=\"font-size: 120%;\">Radial crashes are the most common form of air bearing and dicing spindle failures. In a dicing, back grinding or other type of air bearing the rotating shaft is \u201cfloating\u201d on a cushion of air. This allows for super precise rotation. However, when the air supply is insufficient our when forces exceed the ability of the air cushion to support the shaft, it can contact the bearing journal. This is a crash.<\/span><\/p>\n<p><span style=\"font-size: 120%;\">These crashes damage the radial bearing surfaces and jets. They can be caused by excessive feed-rate, misalignment, improper program input and contamination in the spindle air supply.\u00a0 HST has developed several technics for restoring radial bearing to like new condition regardless of the cause of the crash.<\/span><\/p>\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-1664489064\" 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=\"box has-hover   has-hover box-text-bottom\" >\n\n\t\t<div class=\"box-image\" >\n\t\t\t\t\t\t<div class=\"\" >\n\t\t\t\t<img width=\"650\" height=\"196\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/01\/Picture34.jpg\" class=\"attachment- size-\" alt=\"\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/01\/Picture34.jpg 650w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/01\/Picture34-600x181.jpg 600w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/>\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\t<div class=\"box-text text-center\" >\n\t\t\t<div class=\"box-text-inner\">\n\t\t\t\t\n<p style=\"text-align: left;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <span style=\"font-size: 120%;\"><strong>\u00a0Radial Bearing damage resulting from a hard crash\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Radial Bearing repair result of HST expertise<\/strong><\/span><\/p>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-747244157\" class=\"col small-12 large-12\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p><span style=\"font-size: 120%;\">When the spinning shaft contacts the radial bearing it can result in galling and damage to the bearing surface area. The crash can also cause material to fill in and damage or clog the bearing jets. Conversely, clogged jets can result in a radial crash by reducing the lift.<\/span><\/p>\n<p><span style=\"font-size: 120%;\">The photo below is a closer look at the above left photo. It shows a crash that was the result of excessive feed rate. The spinning steel shaft rubbed and galled the softer brass material. The damage is obvious.<\/span><\/p>\n\t<div class=\"box has-hover   has-hover box-text-bottom\" >\n\n\t\t<div class=\"box-image\" style=\"width:60%;\">\n\t\t\t\t\t\t<div class=\"\" >\n\t\t\t\t<img width=\"650\" height=\"324\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/01\/Picture35.jpg\" class=\"attachment- size-\" alt=\"\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/01\/Picture35.jpg 650w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/01\/Picture35-600x299.jpg 600w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/>\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\t<div class=\"box-text text-center\" >\n\t\t\t<div class=\"box-text-inner\">\n\t\t\t\t\n<p style=\"text-align: left;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0<span style=\"font-size: 120%;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 <strong>\u00a0 \u00a0Somewhat less obvious is the material clogging the journal jets. Often these repairs <\/strong><\/span><\/p>\n<p style=\"text-align: left;\"><strong><span style=\"font-size: 120%;\">\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0require the removal of the axial bearing and replacement of journal jets<\/span><\/strong><\/p>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n\n\t<div id=\"col-504124599\" class=\"col small-12 large-12\"  >\n\t\t<div class=\"col-inner\"  >\n\t\t\t\n\t\t\t\n<p><span style=\"font-size: 120%;\">Crashes can also occur when contamination in the spindle air results in clogged journal jets. This results in loss of lift and allows the spinning shaft to contact the bearing surface.<\/span><\/p>\n<p><span style=\"font-size: 120%;\">The journal jets on this radial bearing became clogged over time. Apparently there was some moisture in the spindle supply air that allowed mineral deposits of some type to actually grow in the jet orifices. In time the jets became so clogged that the airflow could no longer support the rotating shaft.\u00a0 We had to replace most of the jets.<\/span><\/p>\n\t<div class=\"box has-hover   has-hover box-text-bottom\" >\n\n\t\t<div class=\"box-image\" >\n\t\t\t\t\t\t<div class=\"\" >\n\t\t\t\t<img width=\"650\" height=\"258\" src=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/01\/Picture37.jpg\" class=\"attachment- size-\" alt=\"\" decoding=\"async\" loading=\"lazy\" srcset=\"https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/01\/Picture37.jpg 650w, https:\/\/www.ptclinearmotion.com\/wp-content\/uploads\/2022\/01\/Picture37-600x238.jpg 600w\" sizes=\"(max-width: 650px) 100vw, 650px\" \/>\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\n\t\t<div class=\"box-text text-center\" >\n\t\t\t<div class=\"box-text-inner\">\n\t\t\t\t\n<p style=\"text-align: left;\"><span style=\"font-size: 120%;\"><strong>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0We removed this radial bearing from the housing to repair\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Clogged journal jet magnified 200X\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 clogged journal jets.\u00a0 \u00a0 \u00a0<\/strong> \u00a0 <\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-size: 120%;\">\u00a0 \u00a0<\/span><\/p>\n<p style=\"text-align: left;\"><span style=\"font-size: 120%;\">\u00a0 \u00a0 \u00a0\u00a0<\/span><\/p>\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>\n\t\n\t\t<\/div>\n\t\t\t<\/div>\n\n\t\n<\/div>\n\t\t<\/div>\n\n\t\t\n<style>\n#section_1235097097 {\n  padding-top: 30px;\n  padding-bottom: 30px;\n}\n<\/style>\n\t<\/section>\n\t\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.9 - 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