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Watchmakers Lathe Motor Pulley Slipping

JBerry

By JBerry
in Tools & Equipment

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JBerry WRT Addict

JBerry

Posted
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Hey folks,

I recently purchased an 8mm Star watchmakers Lathe and a cheap chinese YDK Sewing Machine Motor to power it from eBay.

Regardless of the tension I put on the 4mm belt, the belt slips over the motor pulley and fails to turn the headstock.

Can anyone think of an easy fix to this problem? or a suitable pulley for this motor and a 4mm belt (the shaft onto which the pulley fits is 6.35mm in diameter)
If only I had a functional lathe to turn the pulley ;)

Thanks in advance!

 

 

nickelsilver Distinguished Member

nickelsilver

Posted
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Can you post a pic of the pulley? A round belt should sit about midway in the "v". If it hits bottom you're gonna slip. If it's making good contact, though it sounds weird beeswax helps grip.

nickelsilver Distinguished Member

nickelsilver

Posted
Posted

Yeah no way you have enough contact there. You can try to turn the v deeper but ha need a lathe for that. Worst case use a triangular file and file it. It'll probably seat on the rest of the factory v once there's clearance.

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JBerry WRT Addict

JBerry

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Keeping the motor between my legs and using the foot switch to turn it on and off, I turned the V a bit deeper with a graver. Still not a great deal of purchase, very little torque and a lot of slipping...

Anyone know where to source a more appropriate pulley?

JimmyD WRT Addict

JimmyD

Posted
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When I was an apprentice antique restorer way back in the 60's and machines being used were made in the 40's we used to use Pine resin for slipping belts. It was left to dry and then crushed to a rough powder, worked a treat on leather belts, not sure how it would go on today's synthetic belts though.  

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measuretwice WRT Addict

measuretwice

Posted
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5 hours ago, JBerry said:

Anyone know where to source a more appropriate pulley?

Well.....since I was so bullish on you getting the Star, I'm feeling bad its not yet working.....I'll make you a pulley if you like.  One time offer, I am not going into pulley business lol.   You have to supply a good dimensioned drawing of exactly what you want and postage.

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vinn3 Distinguished Member

vinn3

Posted
Posted

  bar soap will also stop slippage.  we used it on old "flat belt  lathes and mills".   i used it later on auto "v  belts".  it may work on any belt - leather or rubber.  vin

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