using a 775 pro for our shooter. we are getting poor performance out of it. pulling 40 amps at 11.5 volts(measured via pdp) and getting smoking hot just free spinning banebots 3 7/8 wheels with a 2 to 1 reduction via belts all running on thunder hex in vexpro bearings, belt center distance was set in cad so they are appropriate tightness. the wheels spin with little to no resistance by hand according to the spec sheet the motor should be somewhere around 12500 rpm, i did not have the ability to measure the rpm at the time but it was no where near that. we did no break in just straight to the shooter for test shots. can the lack of break in cause the poor performance or is there something i am missing.
also whats everyone’s opinion on breaking them in. i know some rc people like to break in there 775s at 3v in water for 20 mins
we dumped the versa in the first hr it pulled 60 amps using the versa 1 to 1.
we press fit a hex shaft onto the 775 and used the versa case to mount the motor with the guts removed. dropped to 40 amps just with that change
We too had some issues with our 775Pro motors and the versaplanetaries… Everything needs to be just right to get the free current down to 10 Amps or less. We are running dual vertical axis shooter, 3:1 with our VPs and dual 3.5 inch Colsons per axis. We had to really crank down on the clamp for the motor shaft to keep it from spinning.
We’re using 775pros with VersaPlaneteries in multiple places with no problem really (3:1, 30:1, and 100:1). The 3:1 goes into a 1:1.2 driving 4" AndyMark Stealth Wheels. At about 7k RPM (at the wheels), we’re seeing about 10A current draw, which is right in line with the spec sheet. It gets pretty hot after 10 minutes of continuous usage, but that is completely reasonable. I can check with our students, but I don’t think they did anything particularly special when putting together the planeteries.