Quote:
Originally Posted by Tom Line
775's have another black mark against them - that's the shorting issue teams had when they were first released. There's nothing more frustrating than having to repeatedly change out 775 motors during inspection because of internal debris causing shorts that ground your PD board.
We haven't used them since that year. Fool me once, etc. Many other teams have used them since then.
We used 550's very successfully on our drivetrain in 2008. That year, however, you were generally trying to drive at full speed. This year, there is a lot of slower-motion movement aligning, adjusting, and setting things down. That means that any low mass air-cooled motor is not going to be terribly happy. Active cooling on the motor (a fan) will help tremendously.
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This is absolutely a huge issue. Case shorting is directly attributed to overheating the enamel on the commutator shaft. The BaneBot transmissions that blocked the air intake vent were the leading cause of failure when this issue was present in 2010-2012. Many of the newer transmissions I've seen have this air intake slot already machined into the transmission.
If you have a transmission without an air intake slot, it would be best to mill a slot for air intake.