Drive belt tensioning dolly wheel

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Drive belt tensioning dolly wheel

This topic has 7 replies, 6 voices, and was last updated 8 April 2010 at 17:26 by Clive Foster.

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7 April 2010 at 20:51 #5024
John Coates
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@johncoates48577
How to make one
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7 April 2010 at 20:51 #50488
John Coates
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@johncoates48577
I have replaced the drive belt on my lathe with a V belt (was Nu T-link) and new drive pulley

There is some slack in the belt I want to be able to tension out with a dolly wheel much like the one in the 8th photo on lathes.co.uk:

Link to the Barker lathe section on lathes.co.uk

I am trying different drive pulleys on the belt spindle to see how they affect the mandrel speed

But I have tried to Google such a device and can’t find anything similar. The wheel is causing the main problem – as to where to get one. The arm will be a small piece of steel with the bolt fixing through the case at one end and the dolly wheel at the other with some sort of bearing to let it rotate

Any help appreciated

John
7 April 2010 at 21:56 #50494
Keith Long
Participant
@keithlong89920
Hi John

For something quick and simple, and ought to be available pretty cheaply as well, what about a roller skate or skateboard wheel. They normally have ball races for bearings and can stand quite a large weight acting on them as well as shock loads so should be easily capable of tensioning a belt.

It might be worth talking to your local garden machine supplier as well, the larger rotary mowers, esp. ride-on size, often have belt tensioning pulleys fitted under the deck as part of the transmission. I’ve used one of these on the drive to my lathe BUT it fits inside the belt not outside as you require. I’m sure outside jockies are available though, have a look on E-bay.

Keith
7 April 2010 at 22:04 #50496
John Coates
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@johncoates48577
Thanks Keith

Would’ve helped if I had known to call it a “jockey” rather than a “dolly” !

John
7 April 2010 at 22:04 #50497
Jeff Dayman
Participant
@jeffdayman43397
How about shortening a tubular roller from a conveyor belt? good bearings already in those…

or a wheel from a commercial paint roller?

or a wallpaper roller tool?

Hope one of these works. Failing that , you could make a solid aluminum one with a pressed in ball bearing quite easily. A 2″ offcut of 2″ dia alloy would not be too expensive.

Cheers Jeff
8 April 2010 at 02:28 #50505
Ian S C
Participant
@iansc
Hi John, just ge a large dia ball race, even a good second hand one would be OK.Go for a large dia bearing and use a bush inside it rather than a small bearing with some thing pressed on the out side. Ian S C
8 April 2010 at 09:44 #50508
Gordon W
Participant
@gordonw
Go down to local garage, get old jockey wheels of timing belts. These should be replaced with new belt, so plenty being scrapped and are usually OK for all sorts of uses.
8 April 2010 at 17:26 #50520
Clive Foster
Participant
@clivefoster55965
Gordon’s suggestion of a timing belt jockey wheel works well, I used one off a Lancia HPE (Fiat twin cam motor) in the drive system of a SouthBend 9″ for many years. Get the bracket and spring assembly too if you can. Saves work. On the Southbend I used two stage all Vee belt primary drive from motor to countershaft instead of the standard single stage Vee to flat system. I made the second stage two speed with the spring loaded jockey pulley tensioner operated via a cable from an over centre lever. The lever operation not only made speed changing easy but also formed a simple but effective clutch. I found it easier to use a reversed cable link with the inner wire fixed and the outer sliding back and forth to transmit the movement from lever to pulley arm.

I’d previously used a tube sleeve pressed onto a pair of ball races for a similar job. Effective but, as is so often the case with these little jobs, it took considerably more making than anticipated.

Clive
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