Overspin/similar issue

Discussion in 'Gun Building, Modifications & Repairs' started by Peeque, Jan 25, 2017.

  1. Peeque

    Peeque Active Member Supporting Member

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    Video of issue

    I ran into an overspin issue and read that shortstroking would stop that. I dremeled off two teeth of the gear that contacts the piston (bevel right?).

    After I did that I ran into electrical issues. I completely rewired the gun, and it blew two 30A fuses. I removed the fuse from the circuit because I didn't have any more fuses. I was still having some problem after that, when I pulled the trigger the motor wouldn't spin at all. The MOSFET I had broke so I removed that. Now I'm going with no MOSFET or fuse, this is just temporary until I can fix the overspin issue. I am using an 11.1v 2200mAh 30-40C LiPo, it happens with a 7.4v 1500mAh 25C LiPo too.

    The video linked above is where I'm at now. The motor is getting power and the gun is cycling but it cycles once and then part of another cycle. When it does that it jams the trigger so I have to switch to fullauto and fire, and then semi will work again. Watch the video to see what I mean.

    I though that shortstroking would fix the problem but it didn't, it's still overspinning and shoots 1.5 times when I pull the trigger. I don't know what else to do. Overspin may not be the problem, but that's what it seems like. Would an AB MOSFET fix this? I was using a NukeFET before it broke. Should I try a stronger spring? I have either an M130 or M140 in it now, with 13:1 gears.
     
    Last edited: Jan 25, 2017
  2. -Spitfire-

    -Spitfire- Well-Known Member Supporting Member

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    Yeah... Short stroking by itself won't fix overspin. You need a heavier spring as well (the short stroking is so your fps stays the same with the beefier spring).
     

  3. Peeque

    Peeque Active Member Supporting Member

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    I'm not sure if I have an M130 or M140 so I'm just gonna assume I have an M140. Should I go with an M150 or M160? Or buy them both and see which one works.
     
  4. -Spitfire-

    -Spitfire- Well-Known Member Supporting Member

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    What's your target fps?
     
  5. Peeque

    Peeque Active Member Supporting Member

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    Anything over 300 is fine, but has to be below 420.
     
    Last edited: Jan 25, 2017
  6. Airborne101

    Airborne101 Well-Known Member

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    The M130 or M140 you think you have should be fine.
     
  7. Peeque

    Peeque Active Member Supporting Member

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    If the spring is fine, what else could be causing it to over spin? Is the cutoff lever just not working?
     
  8. -Spitfire-

    -Spitfire- Well-Known Member Supporting Member

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    What gears and what motor do you have in it?
     
  9. Lefse

    Lefse Well-Known Member Supporting Member

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    One little "trick" I often do that can decrease overspin quite a bit is to shorten the spring that pulls the trigger switch trolley back. Just cut off 2-3 coils and bend out a new "hook". this will make the trigger switch disengage more quickly and can decrease overspin.
     
  10. Peeque

    Peeque Active Member Supporting Member

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    SHS 13:1 Gears. I was using a ZCI HT but I broke the copper wires next to where you connect the motor connectors. Now I'm using a Lonex A2, but I plan on getting a new ZCI HT if I can't fix it.

    I will try that tomorrow and let you know if it worked or not.
     
  11. Lefse

    Lefse Well-Known Member Supporting Member

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    Lonex motors actually tend to give extra overspin because of the slanted armature design. I used Lonex motors in the past and I definitely got more overspin with them than with other motors with regular straight armatures.
     
  12. Peeque

    Peeque Active Member Supporting Member

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    I was using the ZCI HT when I ran into the overspin problem, I'm only using the Lonex motor now because I broke the ZCI one. Should I try using the stock motor? I don't think it can pull the spring though.
     
  13. Lefse

    Lefse Well-Known Member Supporting Member

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    It's caused by some other issue then, most likely the cut-off lever, or maybe the trigger switch sticks a bit.
     
  14. cetane

    cetane Active Member

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    If you just broke a brush shunt on the zci, try swapping the brushes out of your stock motor into the zci to get it back up and running.
     
  15. Peeque

    Peeque Active Member Supporting Member

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    I will do that tomorrow too.

    I will buy a new cut-off lever, I think I'm still using the stock one.
     
    Last edited: Jan 25, 2017
  16. BoogerMc

    BoogerMc Airsoft Jedi Master Supporting Member

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    I just had an A2 crap out on me, when I took it apart, it had a straight armature. Do they make two different styles?
     
  17. Lefse

    Lefse Well-Known Member Supporting Member

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    That's interesting, I'm guessing it's either from the latest generation and they changed the design, or it might be from the very first generation and they used straight armatures at one point. All of my Lonex motors had slanted armatures, and I used two different generations.

    I don't use Lonex motors anymore, never had one that actually lasted, my DA/SHS and Guarder motors have performed much better. It seems like the Guarder Infinite Torque Up is being discontinued, which is a shame, it's an excellent motor IMO.
     
  18. BoogerMc

    BoogerMc Airsoft Jedi Master Supporting Member

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    If I'm not mistaken, it is about two years old. I have also used SHS HT, Classic Army HT, and most recently experimenting with a ZCI HT. I have an A2 (short) in two other guns and they've performed beautifully, no problems. The one that crapped out came from my friend Lucky's gun and I have to wonder if it is an issue with the motor or him. He's very hard on his guns and he has a serious bad luck streak, hence the nickname Lucky.
     
  19. Peeque

    Peeque Active Member Supporting Member

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    I did that, there is still some overspin but not nearly as much. It also stopped the trigger from getting jammed on semi-auto.

    I did that and now the motor works again, saved me $30.

    I'm gonna order an M150, hopefully that will remove the rest of the overspin.
     
  20. AirsoftSniperz

    AirsoftSniperz New Member

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    Should he also lighten up his piston and perhaps use lower ratio gears?