Model Engine Maker
Help! => Machines, Tools and Fixtures => Topic started by: Jim on March 03, 2021, 11:02:23 PM
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Crowning a pulley for a flat belt, been trying on some ali before moving onto brass using the top slide set at 1° + and then set at 1° - and it ain't an easy exercise to achieve a simple crowned pulley!
Any hints on how to do this? I thought this was going to be really simple, its kicking my arse!
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1 degree isn't much....5 might be better for belt tracking....try it out on the ali part first
A dead sharp tool with a small polished radius and a steady feed...consider a simple crank on the compound that you can spin smoothly
Got some pictures? Lets see what it's doing?
Dave
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I've only seen them with a curve not two flats so thats how I've made them. You could create the radius the way I do radii; work out a table of X/Z movements and cut the steps with the compound and cross feed. I think on the one below I just eyeballed a few steps and hit it with a file, its not super critical stuff. Then finish with a file and emery to round out the corners of the steps.
(https://i.imgur.com/NIPjtEU.jpg)
(https://i.imgur.com/SEq5gUn.jpg)