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Unread 18-11-2013, 21:03
sanelss sanelss is offline
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Re: Prototype transmission for potential use this year

Quote:
Originally Posted by thefro526 View Post
Depending on the exact specification of the worm wheel and worm this could be a very likely scenario. Like Magnets said, you could switch to a larger worm wheel and a two/four start worm to lessen the tooth loading, and it'll have the added benefit of being more likely to back drive. Under extreme loading rather than locking up.

Your wheel choice is also going to play a huge role in the overall setup robustness, something on the lower end of the scale should start slipping before the transmission fails, where a high traction wheel might not slip until after the gearbox fails, its hard to say exactly without doing some calculations.

Magnets also brought up the subject of shock loading the worm wheel and worm during deceleration which is a very, very likely scenario. A decent bit of braking code could help to lessen the chance of hard stops during most matches, but the right hit or two could ruin your day. If you really wanted to stick with the worm setup and have it lock, a clutch setup could do some really cool stuff, or even some sort of flex plate/flexible coupling in the system to ease the load on the gear.
well the one we are using now is already a 2 start worm. We could go bigger but would probably try to find ones made out of harder material before we go bigger in size. The locking up thing is desired though, if it can survive that is.

Well we are using the vex omni, so i'm sure those will start dragging across the carpet before anything extremely drastic happens.

We are aware of the potential for failure, at least this system will still work with just 3/4 wheels(even 2/4 if opposite corners go out) and are extremely easily replaced, a single bolt, slide axle out, swap gear, and ur back on in less than a minutes worth of time. a clutch setup could help but then you run into complexity and reliability issues. We'll see how far this will take us and if it can survive what we throw at it then we won't be worried.
 


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