How to use a bag motor or a 775 pro motor?

Hello everyone! My first time posting on Chief Delphi, quite nervous.:ahh:

Me and my team recently met a problem with the bag/775 pro motor. We are not sure about how to use these motors since their shafts are round. I found a
Versa Planetary Mounting kit from vex pro(, but unfortunately it was discontinued. We then tried the FTC max shaft hub (, which was designed for the FTC D-shaft motor. However, the hub cannot held onto the shaft and come out frequently. We are really struggling with the problem. What is the correct way of using these motors? :frowning:

Hello! That is a great question to ask. First off, are you familiar with the concept of an interference fit or press fit? For these circular, smaller diameter shafts, press fits are often used to transfer the torque to the pinion. West Coast Products offers gears and pulleys that can be pressed directly onto the shafts of BAG motors and 775Pros. But any gear or pulley with the correct ID (inner diameter) can be pressed onto a motor shaft.

Also, one of the most common ways FRC teams integrate BAG motors and 775Pros into their robots is by using the VersaPlanetary gearboxes by VexPro. These gearboxes use a slightly different method of transferring the initial torque from the motor shaft, but they still provide an excellent way of reducing the motor’s speed to a usable level in a compact and rugged package.

If you have any more questions, feel free to ask!

Versaplanetaries are by far the easiest and most versatile way to use these motors in FRC. Invest in them, your team will benefit.