Post by kEnwaR on Nov 19, 2008 14:40:39 GMT 8
"I have recently seen some people do a mechbox upgrade and
noticed that their method of shimming was basically shimming
till there was no play when they pushed on the axles from out-
side the box. This is a completely inaccurate way to do a
proper shim job and will lead to problems. I have noticed a
recent flood of posts on the various airsoft forums that was
due to inaccurate simming so I have decided to put up this mini
guide.
The following guide is only for stock and flat cut gears.
Helical and all helical gear sets will need to be shimmed
differently becasue of the way the gears are cut.
A good shim job takes time, you have to shim each gear by itself
and then shim it in relation to the next gear that goes on top. It
is more repetitve than difficult once you know what to look out
for.
The benefits of a properly shimmed mechabox are:
Improper shimming leads to a host of problems including:
Remember, there is no one size fits all shim setting, you have
to take into account the variations from mechbox to mechbox and
from stock nylon bushing size to metal bushing size. Metal
bushings are usually thicker than the stock nylon ones so when
you replace them you will need to adjust accordingly. Good luck!"
SkunkWerks Updated 06-17-03
noticed that their method of shimming was basically shimming
till there was no play when they pushed on the axles from out-
side the box. This is a completely inaccurate way to do a
proper shim job and will lead to problems. I have noticed a
recent flood of posts on the various airsoft forums that was
due to inaccurate simming so I have decided to put up this mini
guide.
The following guide is only for stock and flat cut gears.
Helical and all helical gear sets will need to be shimmed
differently becasue of the way the gears are cut.
A good shim job takes time, you have to shim each gear by itself
and then shim it in relation to the next gear that goes on top. It
is more repetitve than difficult once you know what to look out
for.
The benefits of a properly shimmed mechabox are:
- Imporved mechabox effciency.
- Decreases ware on gearbox and gears, thus reducing the amount of metal shavings that get into your lube from excessive ware, Ever wonder why your white grease turns gray after awhile?
- Decreased mechabox sound signature
- Increased battery life.
Improper shimming leads to a host of problems including:
- Locked up gearbox, gears will not turn.
- Low ROF
- Uneven ware on Piston rack teeth
- Grinding of gearbox
- Grinding and preventable ware on gears, may lead to gears
stripping - ...and more.
Remember, there is no one size fits all shim setting, you have
to take into account the variations from mechbox to mechbox and
from stock nylon bushing size to metal bushing size. Metal
bushings are usually thicker than the stock nylon ones so when
you replace them you will need to adjust accordingly. Good luck!"
SkunkWerks Updated 06-17-03
