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Jig to Hold Head in Lathe
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<blockquote data-quote="oexing" data-source="post: 153390" data-attributes="member: 1493"><p>When having the mod on Girdraulics links for needle or ball bearings the easy and simple way would be the line reaming with piloted reamers. These are essential for any girder overhaul and without them it will be a crap job. But before reaming one has to check links for twist and parallel axis of all spindles so it would not be a surprise to me to find all sorts of flaws in used parts - which can be the root of excessive friction within standard used Girdraulics and not really the plain bearings to blame. I wonder how companies deal with the ball bearing mod on these links without piloted reamers. Vincent Speet made a jig for the mill to get this job done - the laborious way. But in cruel life I am sorry to say the ball or needle bearing mod can be a way to conceal poorly aligned link arms as you don´t feel the crooked bores by spinning the new spindle in these bearings. </p><p> Still I cannot believe that friction in standard bushed Girdraulics to be more than 10 percent of extension or compression forces in the hydraulic damper and effecting the ride much. But then my thinking would be based on correct geometry in all girder components. Conditions will be a lot worse in thoroughly mangled forks and ball bearings will have a huge effect , but then the plain bushes are not to blame when really the poor condition of various components is the root of the drama, so the ball bearings are just to gloss over deeper based defects. </p><p> Below a set of Hunger piloted reamers, biggest in my stock is up to 45 mm. I´d think for not so small runs of ball bearing mods it should pay to get one of them , 33 mm o.d. ?? Also for line reaming standard bushes I´d accept no other tools - crap tools will produce crap jobs typically. New reamers up to34mm can be € 200-300.- but they turn up in Ebay used . Don´t get Indian or whatever reamers, junk as you want adjustable reamers with uneven spacing between blades. Otherwise you´ll have chatter marks and out of round bores - useless. </p><p></p><p> Vic</p><p>[URL unfurl="true"]https://www.ebay.co.uk/itm/124843087101?_trkparms=ispr%3D1&hash=item1d113a54fd:g:QL4AAOSwQjphDtLh&amdata=enc%3AAQAGAAACoPYe5NmHp%252B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsSxXDXcCydCuSj2Tq2S%252F3GnmtBsiMVGgMM4Eh7XOtjQGZJcjwlHaDMUCdmDueAFvvAL%252BwDOTX%252Brr4RYiNjNygtsXJAOC%252BfwSCldI%252BFgT2zO1ayup4ih1WSsS19XyrbDVb6LXUATqwo2xTxmyhwJf7zSZJM60uC3H3eiZSj%252FtqMM47GAbDvS%252Ba8JPOeu08%252Bxbf9pwSZ2P7lTIQKID%252BPNs84PqqbfsVKEeMr54gXzHfp%252FgcCrmgxemTKMJl%252FeXxZpuPHqPR0PeMHzS%252Bd8id7%252BK32uTSd0l%252BxCxDPlKGyes3LBRYiWSJ8k2WTYRole%252FE7KMKW3X9UX9doXalJ0aCrzC%252FVdBGx0Vu2vWETDAvFKISctLwqc3lZYTn3NqgjEUf7ZF1R5R464hYqld7kbmN0mNJsRCq8lmKaB5t%252BBnLKv2UsfgahJIlN6v6%252FPm%252B4ekzO0XSCSyqttvrcOe3mAk7Evn4Dk3xhC3JysN%252BACd2X6Ghn1MOT8NG%252BGa5vOKwrySYvn%252Fo4v10SNfgrWSXfhL8ql8tj9j40RRsi8eujTFJws%252Be0b2CeqhmwAAfUWEGiOjFdTAYKZZTsUwbijUWfujd0LIGKJNulwFmIPS%252Fre9ejY%252FJGcuotZwXOuGeVEvpT%252BLHq68EQFDI0gBqM530z%252Bqh0KknJZh1d0SO8rY2fxsQyb8%252BNXSfa3mXMe9vKEf5kAYrq58DBwlZmE3xOpH%252FFU%252Fka5gA0AAz5%252FoMMHpksGr7%252FJC%252Bgb0%252FzTrs6kDnm5v1%252BBpFqCp5Fzv2D3oNf3KMgiq%252FJnQi6KyKivuX9aj01V9GsYuNgDy3VWksUcmfSp%252Fpx4znkcBUHdQvjyNd26K8fyHP7HpNElw%253D%253D%7Cclp%3A2334524%7Ctkp%3ABFBMvJOX5uxf[/URL]</p><p></p><p>[ATTACH=full]48005[/ATTACH]</p></blockquote><p></p>
[QUOTE="oexing, post: 153390, member: 1493"] When having the mod on Girdraulics links for needle or ball bearings the easy and simple way would be the line reaming with piloted reamers. These are essential for any girder overhaul and without them it will be a crap job. But before reaming one has to check links for twist and parallel axis of all spindles so it would not be a surprise to me to find all sorts of flaws in used parts - which can be the root of excessive friction within standard used Girdraulics and not really the plain bearings to blame. I wonder how companies deal with the ball bearing mod on these links without piloted reamers. Vincent Speet made a jig for the mill to get this job done - the laborious way. But in cruel life I am sorry to say the ball or needle bearing mod can be a way to conceal poorly aligned link arms as you don´t feel the crooked bores by spinning the new spindle in these bearings. Still I cannot believe that friction in standard bushed Girdraulics to be more than 10 percent of extension or compression forces in the hydraulic damper and effecting the ride much. But then my thinking would be based on correct geometry in all girder components. Conditions will be a lot worse in thoroughly mangled forks and ball bearings will have a huge effect , but then the plain bushes are not to blame when really the poor condition of various components is the root of the drama, so the ball bearings are just to gloss over deeper based defects. Below a set of Hunger piloted reamers, biggest in my stock is up to 45 mm. I´d think for not so small runs of ball bearing mods it should pay to get one of them , 33 mm o.d. ?? Also for line reaming standard bushes I´d accept no other tools - crap tools will produce crap jobs typically. New reamers up to34mm can be € 200-300.- but they turn up in Ebay used . Don´t get Indian or whatever reamers, junk as you want adjustable reamers with uneven spacing between blades. Otherwise you´ll have chatter marks and out of round bores - useless. Vic [URL unfurl="true"]https://www.ebay.co.uk/itm/124843087101?_trkparms=ispr%3D1&hash=item1d113a54fd:g:QL4AAOSwQjphDtLh&amdata=enc%3AAQAGAAACoPYe5NmHp%252B2JMhMi7yxGiTJkPrKr5t53CooMSQt2orsSxXDXcCydCuSj2Tq2S%252F3GnmtBsiMVGgMM4Eh7XOtjQGZJcjwlHaDMUCdmDueAFvvAL%252BwDOTX%252Brr4RYiNjNygtsXJAOC%252BfwSCldI%252BFgT2zO1ayup4ih1WSsS19XyrbDVb6LXUATqwo2xTxmyhwJf7zSZJM60uC3H3eiZSj%252FtqMM47GAbDvS%252Ba8JPOeu08%252Bxbf9pwSZ2P7lTIQKID%252BPNs84PqqbfsVKEeMr54gXzHfp%252FgcCrmgxemTKMJl%252FeXxZpuPHqPR0PeMHzS%252Bd8id7%252BK32uTSd0l%252BxCxDPlKGyes3LBRYiWSJ8k2WTYRole%252FE7KMKW3X9UX9doXalJ0aCrzC%252FVdBGx0Vu2vWETDAvFKISctLwqc3lZYTn3NqgjEUf7ZF1R5R464hYqld7kbmN0mNJsRCq8lmKaB5t%252BBnLKv2UsfgahJIlN6v6%252FPm%252B4ekzO0XSCSyqttvrcOe3mAk7Evn4Dk3xhC3JysN%252BACd2X6Ghn1MOT8NG%252BGa5vOKwrySYvn%252Fo4v10SNfgrWSXfhL8ql8tj9j40RRsi8eujTFJws%252Be0b2CeqhmwAAfUWEGiOjFdTAYKZZTsUwbijUWfujd0LIGKJNulwFmIPS%252Fre9ejY%252FJGcuotZwXOuGeVEvpT%252BLHq68EQFDI0gBqM530z%252Bqh0KknJZh1d0SO8rY2fxsQyb8%252BNXSfa3mXMe9vKEf5kAYrq58DBwlZmE3xOpH%252FFU%252Fka5gA0AAz5%252FoMMHpksGr7%252FJC%252Bgb0%252FzTrs6kDnm5v1%252BBpFqCp5Fzv2D3oNf3KMgiq%252FJnQi6KyKivuX9aj01V9GsYuNgDy3VWksUcmfSp%252Fpx4znkcBUHdQvjyNd26K8fyHP7HpNElw%253D%253D%7Cclp%3A2334524%7Ctkp%3ABFBMvJOX5uxf[/URL] [ATTACH type="full"]48005[/ATTACH] [/QUOTE]
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