RS775 In Drivetrain?

[baldenb]

Originally Posted by Thad House

I think I remember hearing stories from you guys either in 2011 or 2012 about burning out the 775's on your drives those years.

Also, even with no defense I would not recommend using 775's on drive. Even though they are not going to be stalled pushing, it still takes alot of torque to accelerate a robot. During acceleration, it is sitting at a higher current load generating more heat. Especially if you have a robot that weighs close to 200 lbs loaded. With high traction wheels and a heavy robot, I think it would burn out even trying to accelerate, unless you also had CIMs on the same gearbox to help with the acceleration.

That's a good point, robots this year will be moving around a lot of weight. We might test this on our demonstration/drivebase test robot.

[Jefferson]

Originally Posted by baldenb

We might test this on our demonstration/drivebase test robot.

You gave yourself the best advice in this whole thread. Test it out for yourself in your application. That's really the only way to know.

[cglrcng]

My only personal experience w/ the RS775's is we used them on our shooter head drive wheel to accelerate & shoot those foam basketballs a few years back (one on each side, 1 running forward / 1 reverse on a large wheel in CAN w/ Black Jaguars), and they sometimes made some pretty flames mid- match. YES real fire, not just the magic smoke (we replaced quite a few that season I remember), until we made the mounts huge Alum. heatsinks to bleed off enough heat from the motors (so, in the end there was no real wt. savings in the end result, over using CIMS or mini-Cims).

And they were not constantly reversing direction often as in a drivetrain (or at all), just momentarily stalling of the wheel, as the fed balls made contact, and they were running very hot. Cooling them is very necessary if you do choose that route....Might also want to keep a fire extinguisher really handy while using them to drive weight this year, if that ends up your final choice. Just a suggestion.

They sure made those basketballs fly though, w/ real good backspin too! That Mid-Field Beam Though...Ugggh! Cracked every weld on that 2 sided bot repeatedly.

[Scott Kozutsky]

Honestly, it may work. I wouldn't risk it because any match you don't drive is a match you don't score. At all.

If there's an auto problem and you drive into a wall you could be dead for a match and have to replace drive motors. Even stopping or accelerating abruptly could cause problems.

Stick to CIMs. It will be cheaper and less time consuming to save weight somewhere else then it will be to put 775s in drive then troubleshoot them. Even if it would work properly it's not worth the risk IMHO.