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Unread 05-07-2014, 21:14
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Re: pic: 2-Speed Gearbox

Quote:
Originally Posted by Jared View Post
Agreed. A .250 endmill is where you want to be for these sorts of plates. It's actually significantly stronger than a 3/16th endmill. Even if you're waterjetting the plate, I'd use a minimum radius of an 1/8th. There's a few lightening pockets that can't be cut on your plates, even with radiused corners.

If you're planning to mill the plates, it can be helpful to make the radius 0.126 inches. The extra thousandth makes generating the toolpaths a lot easier. That way, the machine doesn't have to go to a specific point, stop, and change direction; instead, it cuts the fillet as an arc.

I like the design. I'm guessing the upper shaft is .375 hex like the WCP shifter.

The wall thickness on your threaded holes is scary thin. A general rule is to use a circle that has twice the diameter of the hole. Also, the holes should be at the center of their fillets. It's stronger that way.

If you're really looking to save weight, you can get rid of the top set of standoffs and make the closer plate a lot smaller.
Thanks for the suggestions! You're right about the upper shaft, the shaft is identical to one you'd get in a WCP 2-speed. I've been making some adjustments, like centering the holes and adding material around them.

Edit: The larger fillets make the space around the holes much better, I might post a new screenshot soon.
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Last edited by evanperryg : 05-07-2014 at 21:17.
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