Final drive toothed belts?

Final drive toothed belts?

This topic has 5 replies, 5 voices, and was last updated 4 October 2019 at 17:48 by SillyOldDuffer.

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4 October 2019 at 16:23 #431793
Andrew Tinsley
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@andrewtinsley63637
I have read, or been told that if one uses a toothed belt for the final drive to the lathe mandrel, then you are likely to get a "pattern" on the turned surface. Is this fact or fable?

Andrew.
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4 October 2019 at 16:23 #19490
Andrew Tinsley
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@andrewtinsley63637
4 October 2019 at 17:21 #431807
Michael Gilligan
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@michaelgilligan61133
Posted by Andrew Tinsley on 04/10/2019 16:23:07:

…Is this fact or fable?

Andrew.

.

Probably

… But seriously: There are many variations on the ‘toothed belt’ and some are smoother-running than others.

MichaelG.
4 October 2019 at 17:26 #431809
Tim Stevens
Participant
@timstevens64731
My guess is this:

Properly used – in line with the design criteria – there is less likelihood of patterning than with a gear drive, or a chain drive. Or even, perhaps, from an electric drive driven by AC.

But if the very thought gives you the shivers, why not a poly-V belt drive? No thicker than a toothed belt, and lots of torque capability.

Cheers, Tim
4 October 2019 at 17:40 #431816
vintage engineer
Participant
@vintageengineer
Use two with offset pulleys!
4 October 2019 at 17:48 #431821
SillyOldDuffer
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@sillyoldduffer
Posted by Andrew Tinsley on 04/10/2019 16:23:07:

I have read, or been told that if one uses a toothed belt for the final drive to the lathe mandrel, then you are likely to get a "pattern" on the turned surface. Is this fact or fable?

Andrew.

Only if you have a lathe with a single-phase motor and/or damaged bearings! Single phase motors vibrate much more than any other, and a springy belt would help hide the defect. But if a plain belt is slack enough to absorb single phase vibration, it can't deliver power consistently to the cutter. That's another way of creating an unwanted pattern.

With all the fuss about levelling and Rollies Dad, I'm surprised more interest isn't taken in stopping lathes from vibrating.

Dave
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