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Pulley orientation on lathe (Read 190 times)
 
Richard Brabazon
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brisbane, Queensland, Australia
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Pulley orientation on lathe
Mar 28th, 2017 at 4:45pm
 
Hi All - first post here.
I have a VERY old lathe and have just replaced the motor's bearings and also pulled the headstock down to check the bearings - unlike basic open cage bearings that were in the motor, the headstock bearings arte quality sealed units so live on .
Question when I started to reinstall the 3 speed pulleys - is there a mechanically preferred orientation to better manage the drive loads ?

That is , large or small pulley better closer to the motor body ( bearing ) ?
Looked around at a number of lathe images on line and did not seem to be much either way, so reckoned to ask the experts ......

Thanks
Richard

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David Meade
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Quispamsis, New Brunswick, Canada
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Re: Pulley orientation on lathe
Reply #1 - Mar 28th, 2017 at 5:13pm
 
It is determined by the orientation of the spindle pulley.
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Ed Weber
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Re: Pulley orientation on lathe
Reply #2 - Mar 28th, 2017 at 5:30pm
 
Richard Brabazon wrote on Mar 28th, 2017 at 4:45pm:
is there a mechanically preferred orientation to better manage the drive loads ?


The mounting point of the pulley (set screw) is where the load is transferred from the pulley to the motor shaft. Ideally, you want this to be as close to the motor bearing as possible. The further the load is away from the bearing, (further out on the shaft) the greater the leverage and side load on the bearing.
That being said, Ive seen pulleys mounted both ways but in your circumstance I would want to avoid any excess bearing load due to the bearing maintenance difficulties.
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