[FTC]: Using TETRIX work gear assembly.

[PhilBot]

Originally Posted by link

We are seeing the same problems. Those set screws are not very strong. Did you ever find a better solution than glueing them all together?

No, and in the end we abandoned the worms altogether. No matter what we did the gear/shaft coupling ended up failing. My motto has always been never to use the shaft to transfer the high torque, and this turned out not to be an exception to the rule.

The alternate solution was to use smaller pinion gears on the motor to direct drive a tetrix gear.

Servo city (among others) has some compatible 32 pitch gears that fit nicely on the Motor shaft, with very low tooth counts. Specifically 16 - 24 tooth.

https://www.servocity.com/html/32_pi...l#.UyO65ibD-70

By combining one of these with an 80 or 120 tooth gear you can get some high ratios... eg: 16 - 80 tooth is 5:1 16-120 is 7.5:1

On our arm, we used the 16:80 and then followed by as 40:80. The 10:1 was enough to lift our robot.

[WIREDFTC]

My solution to that would be to drill small holes, in the axle for the set screws to sit in so it transfers torque between the gear and shaft better, and then you can combine that with loctite.