Helical Gear Shimming

[turok_t]

Ive been doing some research on this site and on yahoo. Anyone know a good guide to shimming HELICAL gears? I know how to shim regular flat gears. I visited this link already- http://pageproducer.arczip.com/daedalus03/shim.html but it deals with flat gears.

Any other links for shimming helical gears?

[sushicake]

Same way you shim flat gears, just need to take more time and patience. You also need to use a half tooth piston with helical gears IIRC due to the way it's designed.

[Thenooblord]

Originally Posted by sushicake

Same way you shim flat gears, just need to take more time and patience. You also need to use a half tooth piston with helical gears IIRC due to the way it's designed.

thats super torque gears i think...

[turok_t]

it seems like no matter how many shims i add, and i test spin it, the sound is the same.. how do i know if its shimmed corectly or not?

[Thenooblord]

if theres no play and the gears line up...

[sushicake]

Aslong as the gears dont move side to side and are spinning freely and are lined up you're fine. You gotta remember that you just cant close the gearbox and spin it you have to screw in the gearbox screws and then spin the gears.

[Amos]

I don't think these guys have much experience shimming helicals..

You want a VERY little bit of play once everything is tightened down, you not only have to make sure that the gears aren't contacting each other, but you have to make sure that the helical teeth are getting as much contact as possible without any rubbing or grinding.

With prom double torques and 8mm kanzen bearings I was able to get 9-12 revolutions free spin.

[ThunderCactus]

Remember most importantly, the only difference between shimming helical and flat gears is helical gears can rub together. Simple enough fix;
put a .3mm shim under the spur gear, and a .5 under the bevel and sector, then do the rest of your adjustment from the opposite side.
and half tooth pistons are only for infinite/max torque gears

[DarkAngel]

Originally Posted by Amos

I don't think these guys have much experience shimming helicals..

You want a VERY little bit of play once everything is tightened down, you not only have to make sure that the gears aren't contacting each other, but you have to make sure that the helical teeth are getting as much contact as possible without any rubbing or grinding.

With prom double torques and 8mm kanzen bearings I was able to get 9-12 revolutions free spin.

+1
Helicals shim differently due to the differen directional forces applied to the gears. Tight Shimming and a good baseline shim is crucial.

If your using Systemas, throw out the shim guide that comes with em. They suck great big donkey balls, considering no 2 boxes are the same, its just retarded to think that you can shim every box from one brand the same. You have to have a good feel for em.

Originally Posted by Thenooblord

if theres no play and the gears line up...

Originally Posted by Thenooblord

I have never shimmed a box for a customer yet

Um... No. Not even close. Considering in your other post, you claim to never have shimmed other people's guns before, I wouldnt go around giving advice to people about shit you dont know.

You need to have some play otherwise you drain your battery, it should freewheel, while maintaining a very VERY slight clearance, while having enough contact to maintain tooth contact. Helical teeth shear alot easier than flat teeth due to the bidirectional force applied if not shimmed correctly.

[Thenooblord]

ive shimmed many of my own boxes, just none for customers, please keep youre raging hate-on for me to one thread so we can keep it organized and easily catalogued

[DarkAngel]

Originally Posted by Thenooblord

ive shimmed many of my own boxes, just none for customers, please keep youre raging hate-on for me to one thread so we can keep it organized and easily catalogued

Im sorry, but your "expert advice" is posted all over the boards. Its soo hard to keep up.

[Amos]

[ThunderCactus]

Why would you NOT shim a mechbox?!?!?!?!
Case and point; 2006-2007 G&P M4's typically last 1 game stock because they'd blow the gears.
A 2006-2007 properly shimmed G&P, that I shimmed, has lasted 300,000+ rounds and over 2 years of use.

SHIMMING IS IMPORTANT

[Whiskey]

Originally Posted by ThunderCactus

Why would you NOT shim a mechbox?!?!?!?!
Case and point; 2006-2007 G&P M4's typically last 1 game stock because they'd blow the gears.
A 2006-2007 properly shimmed G&P, that I shimmed, has lasted 300,000+ rounds and over 2 years of use.

SHIMMING IS IMPORTANT

+1 , Best thing you can do for longevity in a new gun is open up the mechbox and check the shimming (This is for people that know how to work on an AEG mechbox!) . Most of the time I do that plus give everything a good look over for possible problems or future problems. If its a personal gun that I intend to keep and use I will take it down to a bare mechbox shell and perform "the works" lol.

[turok_t]

This post is probably better in this thread... here is a post in the other thread I made:

I usually shim the spur, sector and than the bevel gear in that order, with .01mm increments. Initially, I free spin them in the gearbox to see if it spins smoothly. Then I close the gearbox and fasten the screws and free spin them with my finger (i lost alot of skin on my index finger already) tilting the gearbox in all positions. When I hear friction, or when i see that the spin is reduced at a certain position, then i would shim accordingly. I would do this procedure with each gear, and then with all 3, it took me quite some time. Sometimes I notice that if i shimmed it until there is MINIMAL play, the gears dont turn as much during free spin. However, when i shimmed it less (more side to side movements), it spins more freely. But if there is more side to side movements, this can reduce the contacts between gear teeth which may add certain pressure points on the gears.

So my question is this: I need to balance between free spin versus gear play.. Which one is more important?