kilo_64 Posted October 11, 2010 Report Share Posted October 11, 2010 I just rebuilt my gearbox and installed a set of systema helical gears. After spending a good amount of time shimming these things to perfection; I decided to put the box back together. The piston in question is a stock G&P white piston and the cylinder in question is a stock type 1 cylinder. I also have a system anti reversal installed as well. The gearbox cycles perfectly and rof is scary but what the problem that I keep getting is that on semi; my piston would fire and not reset. What I mean is that from a full rest position (Piston disengaged, taplet plate disengaged) and onto semi fire; the piston would fire and not reset to rest position. Instead, it would rest semi engaged (Piston halfway cocked back with spring engaged) I can't seem to figure out what is going on except that I might be using a wrong piston for the gears? Or that the gears are spinning so fast that its catching the piston a second time before it could fully rest? For those who might bring up my cut off lever, it is perfectly fine and functions as it should (cutting off) Any input from prior experience would be great. Heres my set up just incase: 7mm gearbox BB Spring guide m120 Spring G&P Piston/Guarder Piston head Stock Cylinder type 1 and head Systema Nozzle Systema Taplet Plate Systema Helical Gears Systema Anti Reversal Systema Magnum Motor 11.1v Lipo Battery Link to post Share on other sites
Docv400 Posted October 11, 2010 Report Share Posted October 11, 2010 ...the gears are spinning so fast that its catching the piston a second time before it could fully rest... I think you'll find that's normal when you have a much higher than 'average' ROF. It's just the extra inertia causing the motor and gear-train to over-run slightly, just like a car takes a bit longer to stop from higher speed. As long as it's not firing twice in semi, is it a problem? The only way to stop it happening (without changing your gearbox set-up) is to fit a MOSFET with 'passive braking'. Link to post Share on other sites
kilo_64 Posted October 11, 2010 Author Report Share Posted October 11, 2010 Thanks for the response! To answer your query as to if its a problem; Yes, yes its a problem because I can't decompress my spring to relief tension Link to post Share on other sites
magic_golem Posted October 11, 2010 Report Share Posted October 11, 2010 I agree that it sounds like an overspin problem your having, have you tried a lower voltage battery to see if occurs at lower speeds? helps to narrow things down when going for high rof setups. Link to post Share on other sites
midas Posted October 12, 2010 Report Share Posted October 12, 2010 I would suggest an AB mosfet, if you like the rof. Or different battery if you prefer not to instal a mosfet. One of my setups in an old AK even with a mosfet used to overspin at 35rps....lol.. But was fine at 33. Link to post Share on other sites
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