Banebots Motor Question

[AdamHeard]

A lot of misinformation in this thread.

In low reduction (25:1 and below is what we've used, maybe the 64:1 are good to) the p60s are great.

I wouldn't recommend a 775 due to their case short issues, but some teams have used them without issue.

The AM 500 sized motor, the "FP" and the banebots 550 are all more or less the same motor (all 500 sized motors) with similar power ratings.

[jason701802]

The case short problem is easy to get around, just mount the motor in an isolated environment. The plastic housing of a drill transmission or plastic somewhere else between the motor and the chassis works great for this. I would use the 775 motor before anything for any high-power scoring need (I'm assuming all 4 CIMs would be used up in the drive-train) as it is the third most powerful motor in the KOP (following the CIM and only 18W less than the -0673 FP) and its size allows it to handle high load and stall conditions much better and longer than a 550 or smaller motor.

[Teched3]

Originally Posted by jason701802

The case short problem is easy to get around, just mount the motor in an isolated environment. The plastic housing of a drill transmission or plastic somewhere else between the motor and the chassis works great for this. I would use the 775 motor before anything for any high-power scoring need (I'm assuming all 4 CIMs would be used up in the drive-train) as it is the third most powerful motor in the KOP (following the CIM and only 18W less than the -0673 FP) and its size allows it to handle high load and stall conditions much better and longer than a 550 or smaller motor.

The case short issue on the 775's is present right out of the box. Test the terminals with an ohmmeter to the case before using them. I agree all electronics and motor vents should be protected, and never cut or drill on your robot without covering components. Then test all systems before you're ready to compete.

[Ether]

Originally Posted by jason701802

The case short problem is easy to get around, just mount the motor in an isolated environment. The plastic housing of a drill transmission or plastic somewhere else between the motor and the chassis works great for this.

Some have reported in other threads that the short can travel thru the motor's output shaft and find its way to the chassis.

[Ether]

Originally Posted by jason701802

I would use the 775 motor before anything for any high-power scoring need (I'm assuming all 4 CIMs would be used up in the drive-train) as it is the third most powerful motor in the KOP (following the CIM and only 18W less than the -0673 FP) and its size allows it to handle high load and stall conditions much better and longer than a 550 or smaller motor.

Here's some data, FWIW:

550-12 stalled at 12 volts: 70.5 ozin torque and 1020 watts heating.

775-18 stalled at 7.5 volts: 70.5 ozin torque and 406 watts heating.

[Kevin Sevcik]

The Banebots P60 gearboxes should be perfectly fine for powering a shooter wheel. As Adam said, you start running into problems if you use them in large reductions driving high inertias with shock loads. The failure point is actually where the output shaft meets the final stage carrier plate. It's a "Double-D" shaft/hole connection that's highly prone to deforming and camming out under shock loads. A low reduction gearbox into a shooter wheel just isn't going to have this problem.

As for lead times, last year was obviously horrendous with 20 day lead times or more. BB is currently stating up to 6 day lead times on orders. I think the lead time gets bad because they have such a modular system and they build each gearbox to order.

PROTIP: If you need a P60 gearbox RIGHT NOW, order all the individual parts for it and assemble it yourself.

Last year at the height of the 25-30 day lead times, we ordered wheels and spare P60 parts from BB and they shipped in 2-3 days. So I'm pretty certain you could just order all the various parts you need and they'd ship out much much faster.