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Hobbing a Pulley for driving accessories for Model Steam Engines or Toy Steam En
efrench:
I use a lot of round belts and pulleys on my Rose engine driving cutting frames. The only time they slip is when the tension is too low. It may be worth trying a steeper angle to see if that resolves the problem.
Jim Dobson:
--- Quote from: efrench on July 16, 2024, 12:42:58 PM ---I use a lot of round belts and pulleys on my Rose engine driving cutting frames. The only time they slip is when the tension is too low. It may be worth trying a steeper angle to see if that resolves the problem.
--- End quote ---
Some of these toy engines that we use to run toy accessories are very (very) low powered oscillators and tension on the belt can be enough to stop them in their tracks.
Jim Dobson:
Here's some photos of a vertical transmission that I made some years ago that I have 'retrohobbed' one side of the drive pulleys on this morning.
Jim Dobson:
Retro Hobbing.....(Worm Gearing) I've been busy hobbing my vertical and horizontal transmissions I made some years ago plus a few other accessories.
Things I've learned from doing many now - what works for me.
Lathe 400rpm
Use lots of WD40 and a toothbrush to keep clearing away the chips
Very critical is to have the tap centered perfectly in the middle (spend some time eyeballing this) if there's any chatter whatsoever the tap is either trying ride up or down
Don't put too much pressure on the tap, its not needed and just keep going in a couple of thou at a time. When you're at the depth you want, let the piece rotate at least another 4x for a really clean cut.
Jim Dobson:
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