Airsoft Canada - View Single Post - Bevel gear getting pressed against pinion too hard with no shims?

DropTheBomb · November 15th, 2014, 19:39

So I have a very strange problem occur to me when I attempted to shim my CTAC AK74 which is a JG rebrand. Now it seems that with the original JG gears the bevel and pinion gears grind like crazy, and this is with NO shims on the bottom? (wide part) of the bevel.
I adjusted the motor to be perfect as well.

I managed to improve the noise level drastically by using a KWA bevel (once again no shim on the bottom). I noticed the difference between the two bevels is that the KWA has much deeper groves then the JG one.

Although the KWA bevel does fix the noise I found the rest of the gears kinda become out of wack just to be shimmed properly with the bevel. IE stand much higher then they should, so for example the Anti-reversal latch is actually only 3/4 on the bevel gear.

SO this makes me think that either A) Pinion positioning of the side to side position is somehow messed up or B) gearbox shell is a lemon or C) this is normal for some gearboxes?

To give you some reference of shimming i had to do these are my numbers:

Bevel: Top (narrow end) 0.7mm Bottom(Fat end): 0.00mm

Spur: Top(narrow end) .8mm Bottom(Fat end) 0.7mm

Sector Top(Where sector chip sits) .1mm Bottom(Spur-Sector connection) .8mm

Any Ideas?

November 15th, 2014, 19:39	#1
DropTheBomb Trader rating Join Date: Nov 2008 Location: Calgary, Alberta	Bevel gear getting pressed against pinion too hard with no shims? So I have a very strange problem occur to me when I attempted to shim my CTAC AK74 which is a JG rebrand. Now it seems that with the original JG gears the bevel and pinion gears grind like crazy, and this is with NO shims on the bottom? (wide part) of the bevel. I adjusted the motor to be perfect as well. I managed to improve the noise level drastically by using a KWA bevel (once again no shim on the bottom). I noticed the difference between the two bevels is that the KWA has much deeper groves then the JG one. Although the KWA bevel does fix the noise I found the rest of the gears kinda become out of wack just to be shimmed properly with the bevel. IE stand much higher then they should, so for example the Anti-reversal latch is actually only 3/4 on the bevel gear. SO this makes me think that either A) Pinion positioning of the side to side position is somehow messed up or B) gearbox shell is a lemon or C) this is normal for some gearboxes? To give you some reference of shimming i had to do these are my numbers: Bevel: Top (narrow end) 0.7mm Bottom(Fat end): 0.00mm Spur: Top(narrow end) .8mm Bottom(Fat end) 0.7mm Sector Top(Where sector chip sits) .1mm Bottom(Spur-Sector connection) .8mm Any Ideas?