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Hobbing a Pulley for driving accessories for Model Steam Engines or Toy Steam En

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Jim Dobson:
Hobbing a Pulley for driving accessories for Model Steam Engines or Toy Steam Engines
This worked out really well for a first attempt, I've been wanting to try this for ages to stop belt slippage on pulleys and drive wheels when running accessories off steam engines under load which can very often be a problem as some engines lack the power to be able to put a lot of tension on a small round drive belt.
It’s a great hobby and pastime working on your metal lathe or metal milling machine making parts for model engines and model or toy steam engines.



SwarfnStuff:
Thanks for posting this Jim.

I have seen this done for gears where folk search for of the correct pitch. I think that was for a worm gear with the worm being of a matching threaded spindle.

Less messy than the old belt grip fix especially for little model engines and as you say the thread / pitch is not really important just gaining grip without high tension.

Thanks again,
John B

Jim Dobson:
Thanks John, really happy how this turned out because its always been a problem especially with smaller less powerful steam engines that you can't put a lot of tension on the drive belts with.

efrench:
The angle on the V pulley looks too shallow.  V pulleys for round belts on the Misumi website show a much steeper angle. I've had good success using pulleys with  a 45 degree included angle. 

Jim Dobson:

--- Quote from: efrench on July 15, 2024, 08:07:37 PM ---The angle on the V pulley looks too shallow.  V pulleys for round belts on the Misumi website show a much steeper angle. I've had good success using pulleys with  a 45 degree included angle.

--- End quote ---

We're talking about toy and model steam engines not industrial applications. I mention in the video that the drive pulley is out of my scrap box and being used as a test piece in the experiment an that I would be grinding a HSS cutting tool to a better profile.

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