worm gear servo
 

as much as i dont want 1/4 scale servos on my axles, i really want the unmatched torque they offer. there's got to be an alternative.

i've never seen a worm gear based servo, so i figure i may as well figure out how to make one. here are a few shots of the general idea.

what do you think? do-able? worth it? what kind of torque could i see using a 1/10 scale servo motor? any reasons why this wouldnt work?

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I think it's a great idea. I've pondered the same thing before.

I like how you put the pot directly on the worm wheel.


Might be a little slow though. even with a course pitch (say 20) it would be very slow.

Talk about torque though!

Another huge advantage would be the servo never sees the steering force.

I've looked extensively for a worm drive servo with no luck. I think it's a great idea. And I really don't think that steering speed would be a problem. Let us know if your successful at throwing one together.

Every tooth on the worm wheel = 1 unit of reduction...

So, a 20 tooth wheel would give 20:1

So if it take 1/2 second to turn now it would take 10seconds. That's pretty slow.

But it would turn or snap axle parts!

Tamiya makes a worm-gear set as part of their science series. You should be able to adapt it easily enough, but it's pretty flimsy. It should work for testing, though. If it works you could fab up a beefy frame to hold everything and support the shafts with bearings. The set includes a 140 size motor as well.

I've been thinkig about the same thing except with a worm driven reduction unit (1:1) for a high torque servo. The only purpose would be to provide EXCELLENT holding power since worm gears only transfers power from one end. It wouldn't react to any force on the wheels thus maximizing life of the the servo.

The only thing you have to worry about is power transfer efficiency with worm gears.

How about using an 8T pinion with a high speed servo? Really good idea, just how good it works.

how about rack and pinion steering?

servo pinion http://www.robotzone.com/customer/ho...ns.php?cat=183

racks you can get all over