Gallery, Projects and General > The Design Shop

Variator for small lathe

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BillTodd:
As to the actual torque:  the 200w motor that I was intending to use produces about 1.3Nm at 1450rpm  so that's not a whole lot for the rubber faced disc to transmit.

I think I can get a 1.5 :1 speed reducer at the spindle pulleys and I may add a larger pulley back-gear anyway .

I don't think it'll produce too much smoke :zap:

vtsteam:
Hi Bill, just a clarification: earlier I meant transferable torque, limited by the slipping of the rotors. Yes the size of the disks can increase the theoretical torque (vs RPM) as in all physical reductions. But the actual amount transferable is limited by the point at which the rotors slip.

If however the motor speed is high, and there is a reduction after the variator to compensate, more power can be transferred through the variator than otherwise, before slip happens, since power is a factor of both torque and rpm.

BillTodd:
PhilF's generous donation arrived a few days ago, Cheers Phil  :headbang:

I have now to work out how everything will fit together.

With the pulleys shown, I should get a range if 240 to 2100 rpm , which should be about right for a plain bearing spindle. (Edit 9:1 range not 6:1 !)

Tony has just updated the lathes page with more pictures http://lathes.co.uk/unknown164/

philf:
Bill,

Looking good.

A scan of the Kopp manual is winging it's way to you!

Phil.

vtsteam:
Just noticing that the tailstock base is split, and the lock basically pulls the two lower sections together. Also the locking lever is on the backside of the tailstock.

Also, no set-over adjustment for the tailstock.

One possible solution for that last if you want to turn tapers would be to adapt a small boring head design as a tailstock center.

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