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Post by Red (Eazy-E) on Sept 21, 2014 20:29:14 GMT -5
Hello, so I just got a new motor today to try to get my primary back up and running(G&P m120) and I was installing it into my gun, and when I went to fire the gun, I got about a half cycle on my gearbox, and everything locked up, so I disassembled everything, got the gears all fixed and tryed it again, except this time, I didnt get anything, no locking of the gears, nothing. so I pulled my motor back out to find that my pinion gear will no longer spin, and also when I try to put power to test the motor(tryed to see if an 11.1 lipo would fix it) the motor itself gets very hot. Just looking for some help!
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Post by Bulletproof on Sept 21, 2014 21:17:31 GMT -5
In my very professional opinion, that motor is done fucked.
Could be a lemon. If you got it new, then you should see about exchanging it.
That's all I can think of, but I'm not too great with motors.
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Post by Red (Eazy-E) on Sept 21, 2014 21:29:42 GMT -5
Unfortunately I got it in a trade, but I kinda went ham on it with a pair of pliers, being sure to not mess up the teeth, and I seem to have freed it up again.
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Post by Red (Eazy-E) on Sept 21, 2014 21:34:58 GMT -5
not sure if I damaged anything else in the process, time to test it out again, and find out I guess
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Post by natethegreat32 on Sept 22, 2014 21:54:51 GMT -5
Before you go jamming pliers into your motor, I would pop off the endbell and look to see if there is any debris. I would also set your motor height, a common problem that has your same symptoms is the motor being too high. Try backing off the motor height screw.
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Post by Stinger on Sept 23, 2014 8:40:19 GMT -5
The fact that the motor is heating means it's getting power.
Pull out the motor, plug the wires into it with it OUTSIDE of the gun, plug the battery in, and pull the trigger while HOLDING the motor. If it spins, your problem is inside of the gearbox. If it doesn't spin, the issue is with the motor.
Once you narrow that down, we can figure out how to solve it.
EDIT: Your system is trying to turn but cannot (thus the heat). Be careful with this, as the high resistance can fry MOSFETs.and burn out motors. If something doesn't work while testing, don't keep pulling the trigger to see if it will work.
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Post by stealthyrt on Sept 23, 2014 10:30:46 GMT -5
Hold on... I just recently got a motor brand new but it broke a endbell in shipping. I replaced the endbell and popped it in my gun. I would fire a few shots and then lock up and get very warm, the same symptoms as described by you. I powered it outside the gun and it would spin but it was loud and sounded bad. I got a replacement motor from the company and popped it in the gun and it shoots fine. So I guess what I'm trying to say is even if the motor spins when powered outside the gun, do not trust it.
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Post by Stinger on Sept 23, 2014 12:13:10 GMT -5
Hold on... I just recently got a motor brand new but it broke a endbell in shipping. I replaced the endbell and popped it in my gun. I would fire a few shots and then lock up and get very warm, the same symptoms as described by you. I powered it outside the gun and it would spin but it was loud and sounded bad. I got a replacement motor from the company and popped it in the gun and it shoots fine. So I guess what I'm trying to say is even if the motor spins when powered outside the gun, do not trust it. Ideally you would have another motor to test in the gun. |
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Post by Squirrel on Sept 23, 2014 12:13:54 GMT -5
Stupid question, but that M120 has a pretty strong magnet, have you looked inside of it to see if a screw got pulled into the motor while it was sitting on the bench?
I know it sounds silly, but it actually did happen to me. One of the motor grip screws got pulled inside the motor. It was a huge pain in the butt to get out. There is a chance there could be some sort of debris in it.
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Post by natethegreat32 on Sept 24, 2014 12:12:47 GMT -5
The G&p m120 is actually ferrous magnets, which means they are very weak. It could have pulled in a screw or something, but it could also come out very easily.
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Post by T6e9a on Sept 24, 2014 12:25:39 GMT -5
I havent dealt with a G&P M120 recent enough to remember its magnets, but in other motors, I have found some ferrite magnets that are just about as strong as a cheap/weak/thin Neomagnets.
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Post by Stinger on Sept 24, 2014 15:04:03 GMT -5
The G&p m120 is actually ferrous magnets, which means they are very weak. How is that relevant? It wouldn't be so weak that it would be unable to even turn the gearbox at all. There's obviously something else wrong if it isn't able to make any noise but is still heating up when given power. EDIT: Nevermind, I didn't realise that you were referencing Squirrel's earlier post. You should use the quote feature. |
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Post by Squirrel on Sept 24, 2014 15:58:16 GMT -5
The G&p m120 is actually ferrous magnets, which means they are very weak. It could have pulled in a screw or something, but it could also come out very easily. It is plenty strong to pick up a screw laying next to it on a table. It was really one of those situations where I wasn't paying attention to where all my parts were. It isn't as strong as some high torque motors, but that is pretty irrelevant when it comes to picking up a screw. It is pretty tough to fish a screw out of a motor since there isn't really room to get a tool in. I also don't have a gear puller to get the pinon off to disassemble it the right way. Here is a not strong magnet holding up a flash hider.  |
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Post by natethegreat32 on Sept 24, 2014 17:07:42 GMT -5
Op, Check your motor height. I also reccomend shimming your gun. Also, check to make sure that there is no debris inside your motor. And that none of your windings have broken. Honestly, this situation sounds like your motor height is off, your shimming is too tight, or you are not using a high powered enout battery. It could also be WAY more things like stripped gears / broken parts jamming up the gearbox. The g&p m120 motor is know for being, well bad. The ferrous magnets do not let it grab much torque at all, and the 16 windings is about half of normal stock motors. This is why the trigger response is terrible, but it can shoot around 30 rounds a second on a weak spring. If your'e using anything higher than an m120 spring, the motor can deffinetly not handle it. But like I said before, check the gearbox for any obstructions, shimming, motor height etc.
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Post by Stinger on Sept 24, 2014 17:16:22 GMT -5
Op, Check your motor height. I also reccomend shimming your gun. Also, check to make sure that there is no debris inside your motor. And that none of your windings have broken. Honestly, this situation sounds like your motor height is off, your shimming is too tight, or you are not using a high powered enout battery. It could also be WAY more things like stripped gears / broken parts jamming up the gearbox. The g&p m120 motor is know for being, well bad. The ferrous magnets do not let it grab much torque at all, and the 16 windings is about half of normal stock motors. This is why the trigger response is terrible, but it can shoot around 30 rounds a second on a weak spring. If your'e using anything higher than an m120 spring, the motor can deffinetly not handle it. But like I said before, check the gearbox for any obstructions, shimming, motor height etc. ^ Everything natethegreat32 said is right. Do what I said above to check to see if the motor spins outside of the gearbox. If it does, start looking for all of the things mentioned in the above quote. EDIT: Also, Nate, 16 TPA is standard for motors. A stock motor at, as you said double (so 32), would be ridiculous. Frankentorque motors are 32 TPA. |
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