Need Advice! - Shooter is not performing as expected

[AndrewSears]

We started with a direct drive from a single 2.5 CIM to a 8" Plaction wheel. We did not get the distance we wanted so we made a gear box to increase the RPM of the shooting wheel since torque is not needed. Right now our gear ratio is a 1:6 increase in RPM using two 2.5" CIM motors. With the CIM motors putting out 4000 RPM we expected 24,000 RPM at the shooting wheel. This does take about 2-3 seconds to reach max RPM but it does not appear that we are getting 24,000 RPM out of the wheel. Today we are connecting the encoder to measure our wheel RPM to verify. We seem to have good contact between the shooter wheel and back wall. The Frisbee is sandwiched between 2 UHMW sheets with about 3/16" clearance.

We have a slight flex (about 3/16") causing some vibration but have a solution to stiffen that.

Everything is held in with flanged bearings and we have a mechanical take-up. When we roll the shooter wheel with the power off the wheel rolls very smooth. We do not notice that the belts and chain are slipping.

We tested different settings to the motor controls and found that from the 0-1 scale, 60% power to the motor control visibly gives us the highest output RPM in the shooter wheel.

Our thoughts are that one or all of these are the problem.
- The CIM's are bad.
- The CIM's are not able to handle the load.
- We are loosing too much energy with the slight flexing.
- We have something wrong with programming and not getting the power needed for MAX RPM.

Any thoughts are welcomed and I will share the CAD model with you if this will help you analyze our problem.

Thanks,
Andy

andrew.sears@autodesk.com