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Unread 23-12-2013, 10:12
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Re: Prototype transmission for potential use this year

Quote:
Originally Posted by DavisDad View Post
Hi sanelss,

Thanks so much for sharing the details of your design; the youtube video was terrific!

We're working on a similar design for sim motor/Jaguar/encoder control/Mecanum wheel. Here're some links that describe gear design that have been discussed in this thread:

Surface hardening and polishing of gear wear-in
Gear tooth strength
Worm gear "anti back-drive" or "self locking"

We looked at worm gear to allow getting the CIM motor 90 deg to wheel but are pursuing a 2-stage design with planetary on the wheel shaft and bevel for 90 deg transition:



Do you have advice on where to source gears? I've only found expensive sets for industrial fabrication and very cheap hobby gears.
McMaster sells some, or you could go with one from boston gear. I've done a swerve with the L110y. They're pretty expensive.

As for the drive design, bevel gears are going to be more durable than the worm gear setup. However, you do have to take into account that the two gears will be pushing against each other in every way possible, so you'll need thrust bearings, as much support as possible on your shafts, and you should use shorter shafts to minimize bending. It's also advantageous to run the gears at a higher speed if possible. When the gears run slowly, they can bend away from each other and slip.

Also, whenever you use gears, REMEMBER TO LUBRICATE THEM!