A thing about motors

I think most guys here are using 1000rpm motors or similar style ones and I just thought this worth a mention:
I was checking over the 4wd thing today as I kinda just ignored it since Burgess Hill and one of the motors felt really rough and not good like it was grinding. Closer inspection revealed that the motor had come loose at the gearbox, dunno how well the photo will show it

http://i.imgur.com/CbTPsuK.jpg

Not by much but just enough for the gears not to mesh properly. Took the gearbox off, loctited the screws that hold the motor on and its fine. Only really a problem if you mount your motors by the face.

Just saying you may want to check your motor screws are locked down etc as after running around for while on and off all day this happened.

Good spot Harry. I will be making sure to loctite mine together when they turn up :-)

I had similar problems with my GR02's, I had one fail due to one of the bolts connecting the gearbox and motor not being tightened up as much as the other leaving the motor askew. Not enough to notice without a proper look but enough that it killed a motor through the extra stress ontop of an overvolt (the properly seated motor was fine and happy :) ).

Lesson learned: Check your gearbox and motor sit well together.

I don't think you could refer to any of the motors in your robots as 'Happy', Alex :P

Yeh this is pretty common with these motors. The need to be thread locked.

Steve

Btw harry, what robot are these motors in, it looks like a beetle massacre

Nah I can't afford to make a beetle Massacre. Just a 4wd drive all day thing.

Quote:

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Originally Posted by Rapidrory

I don't think you could refer to any of the motors in your robots as 'Happy', Alex :P

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For the five thousandth time, now the stick travel is limited and the motors seated my drive IS BLOODY HAPPY.

Hehe :L

http://www.teamrollingthunder.com/Ki...le_harden.html

Relevant.

On the motors thread... has anyone over-volted these motors to 4S with any issues? I am considering it for Anvil but with 6 motors on the line I would rather know before I burn them all out!

I can't see why they would suffer, Haz is already running 4S.

Harry is probably boarding the flight back to the UK after being here for a week at the moment. He had two long test sessions whilst here, running these motors on 4s in a 4WD bot (in 30+deg heat!) with no apparent problems. Motors barely got warm and mechanically don't seem to mind the overvolt. Don't know what speedo(s) you're running in Anvil but it will need to be fairly stout for 6 motors.

That is all good information. I have the banebots 10A esc's but they stop at 12V so I would need to get something else to up the voltage. I will run it on 3S at the Brise-norton event and see how she fairs, then I will decided if I need to up the speed.

Take it from me, you will need to upgrade :).

Dan Laybourn is working on a code for the Botbitz 20A, because it's the same make as the TZ85's. This means no random failsafing, and with a 3A BEC and the capability of 4S +, it's going to be a good move for beetles :).

I think Harry tried the 3s rated 10a botbitz on 4s to see how they do, and as expected they got quite hot. The testing here was done on a 5a sabertooth which seems happy (but did get warm) running the 4 1000rpm gearmotors on 4s. He'll probably confirm details in the next 24 hours.

Quote:

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Originally Posted by razerdave

Take it from me, you will need to upgrade :).

Dan Laybourn is working on a code for the Botbitz 20A, because it's the same make as the TZ85's. This means no random failsafing, and with a 3A BEC and the capability of 4S +, it's going to be a good move for beetles :).

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I'm gonna begin work soon but its modifying the open source code available from botbitz for the f-20a and f-30a for the spectrum kit. For specs, just look on hobbyking but when I've had a go, I'll publish the results online.

Quote:

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Originally Posted by Danjr1

I'm gonna begin work soon but its modifying the open source code available from botbitz for the f-20a and f-30a for the spectrum kit. For specs, just look on hobbyking but when I've had a go, I'll publish the results online.

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I would be eternally grateful if you could find a fix for this. They seem like really good controllers if you don't need to mix, which is the issue with the current code...

I've had a go this evening on the f-20a and f-30a and unfortunately i couldnt get the code to work properly so we will all have to look elsewhere for our ESCs.