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Originally Posted by otherguy
Any consensus on whether or not this is legal for FRC 2017?
I could see them being legal if they were considered to be a servo.
I guess my holdup is that when I think servo, I'm picturing a rotary RC hobby type servo (Futaba/HiTec)
They don't look like a traditional servo, but electrically they are effectively equivalent (A DC motor w/ built in potentiometer for feedback). And the rules do not specify that a servo should be rotary/linear. The manufacturer of these components (actuonix) sells them as linear servos.
The only real constraint on servos in the rules appear to be cost (<$75) and they meet that. They also don't draw more than 2.2A in stall, so no immediate concerns about brownout. I think I've convinced myself they are a servo... I'm just not sure every inspector would see it the same way. Thoughts?
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I see these pretty much legal. There's no definition of servo explicity mentioned for FRC, so the usual course is to go to Merriam-Webster:
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a power-driven mechanism that supplements a primary control operated by a comparatively feeble force (as in a servomechanism)
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Power driven mechanism? Check. Supplements primary control? Interprets the PWM signal from the RIO. Operated by a compartively feeble force? I think electrical signal would follow that. I see no reason why these wouldn't be legal, and especially with the REV servo board, you could have a servo up to 7.5 Amps.