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Drive pulley wheels and V belts

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John Coates04/11/2009 17:28:05
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558 forum posts
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Hi again
 
Investigations into my Barker 5" x 24" lathe are progressing well. I have all the speed gears and all but one change wheel.
 
The drive system is another matter. The metal plate on the headstock detailing the speed gear settings says there are two ratios for the drive - 2:1 and 3:1 to vary the mandrel speeds and also the screw cutting pitch
 
The drive pulley on the electric motor spindle says it is a 2"/3"/4"/5" multi wheel unit (but there are only V pulley wheels for the first three sizes). I've seen these in photos of Myfords. A nutlock drive belt then connects to a  16.3" circumference drive pulley wheel on the mandrel.  This can be either locked to the mandrel or can drive the speed gears for speed reduction.
 
So to achieve the 2:1 or 3:1 ratios I need to change the pulley wheel on the  electric motor spindle to a circumference that will achieve these ratios. It also needs to have the correct sized centre hole and a grub screw. Where could I source two drive pulley wheels of the correct sizes to give the proper ratios?
 
Also, having realigned everything I find the nutlock belt is too thick and fouls the casing. I really need a V belt. Where is the best place to get these? I think I will buy two, one for each of the new drive pulleys, so I'll just swap the drive wheel and belt over when I change between ratios.
 
Thanks for any help
 
John

mgj04/11/2009 18:35:07
1017 forum posts
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Almost every bearing supplier should have a shedload.
 
Ashley Bearings in Poole do and so do Premier Power Products in Yeovil.
 
Almost every auto factors.
Ian S C05/11/2009 00:45:20
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7468 forum posts
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I was reading a site on Barker lathes last night and it indicated that changing from one ratio to the other was a rather tedious exercise,I think you know the site on Google.An interesting machine.You'll proberbly find one ratio suitsyou for most,and there it will staymost of the time.New-t-Lock and similar jointed belts are ideal for drive on lathes.IAN S C
John Coates05/11/2009 08:09:50
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558 forum posts
28 photos
Posted by Ian S C on 05/11/2009 00:45:20:
I was reading a site on Barker lathes last night and it indicated that changing from one ratio to the other was a rather tedious exercise,I think you know the site on Google.An interesting machine.You'll proberbly find one ratio suitsyou for most,and there it will staymost of the time.New-t-Lock and similar jointed belts are ideal for drive on lathes.IAN S C
 
I know the site as it is where I started my research. If I had the proper drive pulleys it should be easy as I would remove the wheel and replace it with the other one. But I have this Myford thingy and no jockey wheel to take up the slack.
 
This is why Plan A is to get two drive pulleys of the correct circumference to give me the reduction ratios against the mandrel pulley wheel. I will then get a V belt of the correct length to match each drive wheel or else fabricate a jockey wheel as mine appears to be one of the first Barker's and this must have been a later modification. I need a V belt because there is little clearance between the mandrel drive pulley and the casing but a V belt will sit nicely into the drive pulley.
 
The tedious exercise relates to changing the speed wheels as there are four of them. The lathe as I bought it has two speed wheels locked together on the mandrel to provide a direct drive from the motor. So at the moment I have no idea what speed the mandrel is rotating at but I have bought a speed sensor to measure it.
 
Thanks for the help everyone. I shall scour yellow pages for bearing suppliers
 

Edited By John Coates on 05/11/2009 08:10:24

Ian S C05/11/2009 09:50:23
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7468 forum posts
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If your motor is single phase,its proberbly 4 pole so it will run at about 1420rpm so you can use that as a point to start at to work out the spindle speed. Rule(1)Revs of the driven pully=dia of driverxrevs of driver divided by dia of driven.Rule(2)dia ofdriven pully=dia of driverxrevs of driver div by revs of driven.Rule(3)revs of driver pully=dia ofdrivenxrevs of driven div by dia of driver.Rule(4)Dia of driver pully=dia of drivenxrevs of driven div by revs of driver.A few handy formula if you can unjumble them.If you'r a mathematician like me you either need a calculator,or lots of fingers.Just watching the unvailing statue of Sir Keith Park in London on the TV news.
mgj05/11/2009 18:29:33
1017 forum posts
14 photos
Sometimes it helps if you take your socks off. Stops one running out of counters.
 
Don't forget to use the effective diameter and not the actual diameter. Sorry about grannies if that applies.
John Coates01/12/2009 08:28:44
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558 forum posts
28 photos
Update on this one
 
Went to a local supplier recommended by my club secretary. They have been really helpful, exchanging drive pulleys and A belts that didn't quite fit (or they wrongly ordered!)
 
Upshot is I can have several different drive pulleys as they sold me a 5/8" hub that can accommodate different sized pulleys. Everything has been chnaged so that it can use an A belt as well.
 
So I am well chuffed. And they were cheaper than eBay or RDG Online etc
 
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