gear upgrades blowing fuse

[tt paul]

basically its a,

tm p90 from zero one good gun thanks
stock motor
v6 gearbox
tightbore barrel
box mag
8.4v nimh battery 5000mah
m100 spring
steel bushing, shims

my old spur gear went so i fitted 18.1 shs gears seems ok, then fitted 13.1 gears fires 10-15secs then blows 15a fuse and motor feels warm to touch, im thinking shims??
also had to remove anti reverse latch as rubbed on spur gear ..

do i need a better motor any ides please guys?? thanks

[dave38x]

Re: gear upgrades blowing fuse

Lower ratio gears means (engineeringy speak here) - motor moves slowly for longer as it requires a greater torque at a lower speed to begin compressing the spring.

Slower revolution of motor equals lower impedance of the motor coils.

Lower impedance of motor coils means much higher current flowing which means potentially blown fuse.

I'd have thought a 15a fuse might be a bit low as well, but then again I dont have fuses in my guns. Maybe switch to a 15a time delay?

[BioSniper]

Re: gear upgrades blowing fuse

You removed the AR latch because it rubbed the spur?
Well I will agree it's the shimming because it shouldn't really rub. You also kinda need it as it stops the gearbox running in reverse as such when there is no load on it.

You should re-build your gearbox and include everything that's meant to be in there before troubleshooting any further to be honest with you.
It's there for a reason buddy!

[happyal]

Re: gear upgrades blowing fuse

15a fuse is too low for a higher rof setup. With a high rof gun it draws alot of amps at startup. I would replace the fuse with a 30a one and you should be OK.

[dadio]

Re: gear upgrades blowing fuse

higher fuse rating ,check shimming and definitely needs the anti reverse latch or those gears will shred in no time,it really needs to be there.

[tt paul]

Re: gear upgrades blowing fuse

ok thanks for replies i,ll do as you guys advise see how it goes

[Jez Armstrong]

Just bypass the fuse