Worm Gear

[technoL]

We used a worm gear on our shoulder for this year's robot. Although we used a globe motor instead of a CIM, the gearbox can easily be adapted to fit the shaft. Here's an Inventor rendering of it: http://static.sigmacat108.com/images...nsmission2.jpg

And the actual thing:
http://static.sigmacat108.com/images...mechanical.jpg

-No L

[sanddrag]

And remember, the worm wheel induces an axial load on the worm screw and shaft, so, make sure to use bearings that can handle that sort of (axial/thrust) loading on the worm screw shaft.

[Al Skierkiewicz]

As Sanddrag pointed out, the Chalupa motors cannot handle this kind of load without some help from external bearings. Side loads on these motors require significant (near stall) currents. The same thing can be said for unsupported sprockets and chains.

[Calvin_1631]

so should I buy a worm gear from McMaster-Carr? We would be using it to turn an arm about 270 degrees and will way maybe 15 pounds. As I said, I'm new to this. Thanks.