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Post by brownien on Mar 20, 2013 9:47:12 GMT -5
So I have a CYMA Thompson. (the 1928 model, converted to the -a1) I have been using it for awhile, but I was never happy with the ROF on the stock battery. I bought a new 8.4v (same voltage as the stock battery)and I either fried it or it was crap to begin with, but I also bought a high torque motor for it. I got it all hooked up and attached a fully charged, and functional 8.4v and it works the nuts! The problem is that it only lasts for about a minute then it acts like the battery is dead. just the click-click of the motor trying to turn over but can't. I tried a 9.6v battery with the new motor but alas, it won't even turn over to begin with! I plug in the fresh charged 9.6v and all I get is the dreaded click-click of the motor trying to turn over but stopping. I'm not sure if its just too high a voltage or if the Mah of the battery are too low/high. I don't want to order a new 9.6v that fits the stock and not have it work, and I don't want to order another 8.4v and have either 5 seconds of great ROF or full battery life of crappy ROF. Anyone know what I could do? Also the gun is only about a year old and has had several thousand rounds through it, and this has been my first and only issue.
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Sgt_Tom
Technical Sgt.
Combat!
Posts: 3,580
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Post by Sgt_Tom on Mar 20, 2013 10:04:45 GMT -5
A 9.6 volt should be a able to power the motor. Its possible you didn't install it properly, the motor I mean. If you took the gearbox apart, it could be something inside the gearbox that is out of place like the above poster mentioned. Gearboxes can be tricky so make sure you know what your doing.
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Post by brownien on Mar 20, 2013 10:18:19 GMT -5
I don't believe its the gearbox because i have swapped between the new and old motor multiple times with the same symptoms. The old one works and the new one doesn't want to
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Post by volkssturm on Mar 20, 2013 12:22:48 GMT -5
I don't know if this is related or not, but I ordered a high torque motor for my SIG 550 and had trouble (actually still having trouble) trying to install it. On closer inspection, it appears the body of the high torque motor is about 2 mm longer than the stock motor. On the SIG I can't even get the floor plate screwed all the way down, much less adjust the motor position. You might make a close comparison of your two motors and see if they're dimensionally the same.
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2nd Bat
Master sergeant
Posts: 11,813
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Post by 2nd Bat on Mar 20, 2013 13:05:36 GMT -5
Brownien. Just to clarify on batteries, the voltage is like a cars horsepower and torque rating while the Mah is simply the size of the gas tank. (How long it can last on a charge) With an AEG, a higher voltage motor will provide additional power to drive a heavier spring or more demanding motor. In addition the higher voltage will increase your rate of fire (motor speed) while a smaller motor will reduce it. It sounds to me like that new motor is simply not properly lined up and is binding.
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Post by heckman328 on Mar 20, 2013 17:36:56 GMT -5
Try adjusting the motor height.
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Post by brownien on Apr 3, 2013 15:05:19 GMT -5
I tried adjusting the motor height and that didn't help. It acts like it doesn't have enough juice, but I checked the battery and it has 8.8v steady for an 8.4v small type battery (the battery I have always used) I event tried hooking 2 batteries in series and with a total of 12v, it still wouldnt turn over with the high torque motor. But it still turns over and fires the standard motor, just at a very low ROF.
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Post by jimmiroquai on Apr 3, 2013 19:08:28 GMT -5
Usually, high torque motors need much higher MAH / C rating to turn. If you switch to Lipos that will get it going. Incidentally, high torque motors are for stiffer spring setups. You may want to go with a high speed motor if your have a setup closer to stock. Or better yet, just reinstall the stock motor and use the 9.6V NIMH or a lipo battery with it.
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HornetWSO
Private 1st Class
"We may not have a history, but we have a rendezvous with destiny!"
Posts: 551
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Post by HornetWSO on Apr 3, 2013 19:55:06 GMT -5
i had a similar issue with my ics m3a1. Turned out the shims on gear put too much pressure on the pinion gear on the motor. You my attempt to re-shim your gears to hit the sweet spot. Good luck.
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Post by jimmiroquai on Apr 3, 2013 20:26:37 GMT -5
If it works with the stock motor then it may not be the shims.
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HornetWSO
Private 1st Class
"We may not have a history, but we have a rendezvous with destiny!"
Posts: 551
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Post by HornetWSO on Apr 3, 2013 22:09:14 GMT -5
jimmy I agree, but the hi torque may have different geometry.
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Post by brownien on Apr 7, 2013 22:36:45 GMT -5
I have come to the conclusion that there must be excess resistance somewhere in the electrical system. I plan on getting a wired in mosfet for it and I hope it clears up my problem.
I noted that when I directly connected the battery to the battery contacts that the motor spooled up instantly, but when hooked into the standard electrical connections and trigger pulled, it spooled up nice'n slow.
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Post by brownien on Apr 10, 2013 16:19:24 GMT -5
IT LIVES! ;D I went down to the store and bought a simple normally open relay and wired it in! works better than new! Only thing is I lost one of the plates that actuates the safety mech. Anyone know where I could get another? Id rather not have to buy a half a gun to get it working again.
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