undercut- angle of dogbox pawls

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german4inline
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undercut- angle of dogbox pawls

Post by german4inline » Sun Aug 02, 2015 12:41 pm

Guys,

I`m thinking about making a dog gearbox, apart from the manufacturing it seems not that big problem regarding the design. Does someone know the usual undercut angle of the pawls
of the dogrings (where the dog rings are interlocking into the gears to prevent from disengaging).

Thanks,

Udo

Kevin Johnson
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Re: undercut- angle of dogbox pawls

Post by Kevin Johnson » Sun Aug 02, 2015 9:33 pm


BigBlocksOnTop2
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Re: undercut- angle of dogbox pawls

Post by BigBlocksOnTop2 » Mon Aug 03, 2015 5:39 pm

3° rings a bell

Kevin Johnson
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Re: undercut- angle of dogbox pawls

Post by Kevin Johnson » Mon Aug 03, 2015 10:20 pm

Three degrees.jpg
Three degrees.jpg (646.67 KiB) Viewed 2113 times
This one is 3 degrees. Edit: went back to the drawing and 5.9 degrees seems more appropriate -- doing the BMW below made me do a double-take

Hewland FTR-232  71-2 degrees.jpg
This angle is about 71.2 degrees

BMW 83-6.jpg
This one is about 83.6 degrees or 6.4 degrees depending on your reference.

gr8evo
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Re: undercut- angle of dogbox pawls

Post by gr8evo » Tue Sep 22, 2015 10:08 am

PPG uses 7 degrees. We have cut a few in a pinch to save a gear.

german4inline
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Re: undercut- angle of dogbox pawls

Post by german4inline » Wed Nov 18, 2015 4:28 pm

Thanks a lot, guys.

gr8evo:
7 degrees measured as both sides included angle or just one angle refered to the centerline of the dog?

Udo

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