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Unread 08-01-2018, 05:45 PM
sgeckler sgeckler is offline
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775 threw-up a brush

So how do I put this back inside?

https://drive.google.com/a/team4926....ew?usp=sharing

I think we all know these have been pretty reliable motors. In fact, I don't think we've failed any at Team 4926. But this one spit out a brush last night! I found it 10 ft away. I assume the fan blades threw it, although I wasn't there to see it.
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Unread 08-01-2018, 06:16 PM
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Re: 775 threw-up a brush

One of my favorite memories this year was when our electronics team was freaking out about a brush getting broken and completely sucked into the motor when we were testing it- dont worry about it honestly it should still work. I wouldnt expect an easy way to reattach it since basically you break it after opening it.

EDIT: okay I though that was a fan piece or brush casing... my bad!
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Last edited by messer5740 : 08-01-2018 at 10:45 PM.
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Unread 08-01-2018, 07:06 PM
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Re: 775 threw-up a brush

This kills the motor.
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Unread 08-01-2018, 07:20 PM
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Re: 775 threw-up a brush

There's no coming back from that. It's probably dead already if that fell out. My team burned like 2 775 when that happened so yeah...\_(ツ)_/
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Unread 08-01-2018, 07:57 PM
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Re: 775 threw-up a brush

A question: is this motor still legal to use per R34? Additionally, if you somehow fixed it and got the brush back in, would it be legal then?
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Unread 08-01-2018, 08:21 PM
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Re: 775 threw-up a brush

Quote:
Originally Posted by ClayTownR View Post
A question: is this motor still legal to use per R34? Additionally, if you somehow fixed it and got the brush back in, would it be legal then?
I don't think there's anything in the rules about components modifying themselves...
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Unread 08-01-2018, 09:31 PM
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Re: 775 threw-up a brush

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Originally Posted by bobbysq View Post
I don't think there's anything in the rules about components modifying themselves...
Even if it is deemed to be legal,

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Originally Posted by AdamHeard View Post
This kills the motor.
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Unread 08-02-2018, 06:14 AM
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Re: 775 threw-up a brush

At our off season event, ROBO-CON, one of our eleavator motors sollowed a zip tie. I wrap itself so tightly in the motor that there is no hope of getting it out. RIP 775 #6
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Unread 08-02-2018, 08:41 AM
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Re: 775 threw-up a brush

Even if the motor still spins after the brush flies out, it will run at a fraction of the performance it once had (and eventually fail). Discard the motor so you don't accidentally put it on a future robot, and change it out for a new one.
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Unread 08-02-2018, 08:56 AM
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Re: 775 threw-up a brush

I would assume that if you put the same brush back in (if the motor isn't already killed and the brush is in good shape) that R34 would not be violated since the motor was not changed in any way. If a completely new brush is used, I would expect that to be in violation of the rule.

That being said, if you get it fixed (big if), I wouldn't use it on a competition bot because the motor has to be at least partially killed if it ran any after losing the brush.

Edit: +1 to the post above, label this motor for no competition use.

Am I the only one who read the title and thought of someone in a 775pro costume getting sick and vomiting?
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Last edited by Tomithy : 08-02-2018 at 08:59 AM.
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Unread 08-02-2018, 09:25 AM
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Re: 775 threw-up a brush

Quote:
Originally Posted by Chris is me View Post
Even if the motor still spins after the brush flies out, it will run at a fraction of the performance it once had (and eventually fail). Discard the motor so you don't accidentally put it on a future robot, and change it out for a new one.
This is why I generally have a strict "No used motors on the competition bot" policy, you just never know what kind of shape they're in.
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Unread 08-02-2018, 10:11 AM
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Re: 775 threw-up a brush

We had a similar failure on our two motors running our elevator... twice. While our brushes didn't forcibly eject themselves, you could view inside the motor and see that they were clearly not attached anymore. We opened one of them (with a dremel because it was late Friday afternoon at Heartland and we were curious) and the brush didn't just come out, the metal that was acting as the spring for the brush had snapped. What's funny, is it happened the same side to two motors running two sides of our elevator. Same failure happened at a demo event a few weeks after worlds.
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Unread 08-02-2018, 12:29 PM
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Re: 775 threw-up a brush

775 pros are a bit fragile. If you run them at full voltage and under about %50 free speed for any significant length of time, they will over heat. Brushes coming loose is a symptom of that. Which means you want to stay to the right of peak power on the power/RPM curve.
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Unread 08-03-2018, 02:03 PM
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Re: 775 threw-up a brush

While it is possible to repair this motor, the fact that the brush fell out is proof that the motor has been damaged. I pulled one apart a few years back and found that the actual failure occurred in the brush holder. It cracked and released the brush. I could have used parts from a different motor if that one had failed due to an armature short but the motor is not a huge an expense. Repair is one of those diminishing return kind of operations. Your time costs more that the motor is worth repairing.
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Unread 08-08-2018, 05:53 PM
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Re: 775 threw-up a brush

Spitting out brushes was always the failure mode on 1 motor swerve modules. especially on the practice bot that got ran hard in a 90 degree room. you can take 2 motors that have done this and fix 1 but they will fail again so don't use them in competition. you take the broken brush holder out and replace it with one that didn't break from a different motor making 1 usable motor out of 2 junk ones. we had to do this in 2016 due to 775 being sold out everywhere.

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