Problem with CIM-VersaPlanetary Setup (Choo-Choo motor)

[Ether]

Originally Posted by geomapguy

http://content.vexrobotics.com/vexpr...s_20140211.pdf

Thanks Graham.

Roy, you said "They are bound to break". Have you guys broken one yet with this setup?

[Ether]

Originally Posted by ryaneogilvie

Im pretty sure (you can check the wattage) You can get more power by using the dual motor mount for versa-planetary with two 775's if it fits with your setup.

That depends on the load and the gearing. You can't just compare the max power ratings of the motors. You have to figure what the operating point would be, given the load and the gearing.

[Answer42]

Originally Posted by jblay

We want to get the power that a CIM provides us, the other motors won't do the job at the speeds .

Actually two 775's would do the job. According JVN design calculator, your current setup has a stall torque of 80 foot pounds and a free speed of a little under two revolutions per second. Two 775's plugged into the dual motor input that vex pro sells+ plus swapping out the 5:1 stage you currently have for a 10:1 stage, gives you a gearbox with a free speed of a little over 2 revolutions per second, and a stall torque of 104 foot pounds. Provided you are using a half inch hex output shaft and not cantilevering the load too much, I would imagine that you'd still be safe. Especially providing that the key, and not the gearbox was failing in your current setup. But as you said you're running more torque than vex recommends already.