what is best distance between engine and sawbench pulleys

I have a sawbench which was bought by my late father in 1957 it is not a big sawbench but the table is quite heavy for many years it was powered by the rear pulley of our dexta but for some time I have been looking for a suitable engine that I could mount on a frame and make it into a portable unit at last I have found a perkins power unit that was originally used to drive a fan dryer I would like to know what would be best distance between engine and sawbench pulley there are 2 flat pulleys on the sawbench which will remain and I will need to change the V pulley on the engine
 
I'm not sure there is any specified distance, whatever works best for your design.

But do you need to keep it a flat belt? May be easier and less costly to convert it to v belts.
 
I grew up in the era of flat belts on small industrial diesels and nodding donkey water pumps and similar.

Distance depends on getting enough friction contact on the pulleys to drive, so obviously depends on the load of what you're driving. Longer distance means less problem with maintaining belt tension.

Around 5 hp seems to be spaced at around 15 - 20 feet. The longer the more the belt weight works for you - in our systems the belt slack is on the top as it runs so gravity is on your side.

The flat belts we're getting now look like strips of industrial conveyer belt and heavy. And will NOT stretch if you cut it a bit short (don't ask how I know). Rubber surfaces so plenty of grip.

If you need a shorter span look to V-belts and check out the ones made with multiple V's and a continuous backing - not sure of the technical description.

FWIW
 

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