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Post by goldstar31 on May 1, 2015 7:27:46 GMT
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Post by ettingtonliam on May 1, 2015 7:40:54 GMT
A lot of the problems on small lathes originate from spongy belt drives . Always far less problems with bigger gear driven machines . I thought it was the other way round? Theres a tendency to reflective marks on some lathes with gear final drives, especially straight cut gears, but damped out with belt final drives.
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Post by Deleted on May 1, 2015 8:05:58 GMT
Deleted/
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Post by Deleted on May 1, 2015 8:23:21 GMT
A lot of the problems on small lathes originate from spongy belt drives . Always far less problems with bigger gear driven machines . I thought it was the other way round? Theres a tendency to reflective marks on some lathes with gear final drives, especially straight cut gears, but damped out with belt final drives. What I said is true for chatter proper on small lathes . The marks on turned work on some larger geared head lathes with straight cut gears are often due to interactions between minute profile errors on the gears and less commonly due to bearings . Realistically though - without doing a very detailed investigation of any one lathe design it is often difficult to pin down precise cause of any kind of marking on turned surfaces . Often multiple causes each contributing a little bit to problems . I once heard of a geared head lathe dating from WW2 which emitted a continuous high pitched ringing sound when running . It worked ok for the relatively basic work that it was used for but very annoying for the turner . Various theories and possible solutions were advanced but nothing was done for a long time . Eventually someone decided to have a look inside the gearbox . It was perfectly bone dry - not a trace of oil on the gears or bearings . Must have been running like that for years . Oilways cleared out , new oil put in and lathe worked perfectly again . Regards , MichaelW
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Post by Deleted on May 1, 2015 8:32:22 GMT
Incidentally - the whole character of Myford style lathes with all belt drives can be transformed if trouble is taken to get belt tensions and alignments right .
Many of the reported problems with chatter and parting off on these types of lathes can be considerably reduced if the belts are set up correctly .
Myford give good advice on how to do this but it seems the advice is not always followed .
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Post by goldstar31 on May 1, 2015 8:57:47 GMT
NBG?
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Midland
Elder Statesman
Posts: 1,870
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Post by Midland on May 1, 2015 9:36:30 GMT
Is it chatter, or is it just bouncing off the intermittent cut? Slow it down. Never be afraid to drop right down to the slowest speed on a job that's going to hammer the tool Now Ed, that is a lesson. I thought you had to speed it up but slow it down? Yes I will try that, thanks. D
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Post by goldstar31 on May 1, 2015 11:03:41 GMT
NBG?
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