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Hey guys, Kent here with Fox Airsoft with another Tech Talk video. Today, we are going
to be talking about shimming your gearbox. Shimming is one of the most important aspects
of toning your AEG, simply because it provides the gears with the greatest strength possible,
it keeps them from wobbling around, and keeps the surface contact of the teeth at it's max.
So, you're going to start by opening your gearbox. Remove your entire gear set. As well
as all previous shims. Razor is helpful, for getting those stuck shims off the face of
the gear. Alright, once you have all your shims off, go ahead and get a good bit of
the grease off the gears,make sure you clean up the sector gear teeth-- all that good stuff.
Clean off the dirt and grime. Again, cleaning the the grease off of your gearbox shell.
Just like that. Alright, so when we start shimming we want to start with our spur gear,
which is the middle gear in the train. Fix right into this slot here, so you can see
when I spin this here, is a little bit of rubbing on the bevel gear bushing here. So,
I'm going to take a .01MM shim. We'll start with that on the underside of this gear. It
looks like that is going to give us the clearance we want over those other two bushings. So
we are good on our spur gear for our base. Next we'll go with the sector gear. The big
thing with the sector gear is we want to make sure we shim it as low as possible and keep
it in contact with the spur gear teeth without rubbing on the lower base of the spur gear.
We also want to make sure we are not rubbing on the face of the cut off lever causing extra
wear resistance there. The heights actually not bad right now, I'm going to throw, again,
a .01MM shim on the bottom of this sector gear. Alright, looking pretty good there.
Finally the Bevel, again same process, make sure we're not rubbing on any faces. Looks
like we are moving kinda slow there, so we'll go on and throw .01 MM on there again. Give
that a shot. Now you can see we are spinning a whole lot smoother. So, from there we want
to go ahead and screw our gearbox shell together. You can see I'm using an ICS split V2 lower
gearbox, just for sake of illustration, that you guys can really see what the gear spinning
should look like. This will look the same for just about any gearbox, regardless of
design. Snug it down like you typically would. Just install your gear set and new trigger
switch, cylindar assembly, anti reversal latch. Alright, so after we got screwed together,
our gears are spinning pretty well. So we got good rotation there, however, we have
alot of play up and down on these gears. So I'm going to take a look at these gears and
just guess what kind of shimming we're going to need on each when we go ahead and pull
this back apart, and add more shims to the top of the gears.It's looking like just about
all these are going to need somewhere in the range of .5MM shims. Go ahead and start with
that, see how tight we are. As you can see shimming is really a bit of experimentation
just go from one prevision to the next. Try and find that perfect balance. Again we are
going to snug down our gearbox shell. Since we normally would. We're actually still spinning
quite well, so we are going to check these gears again for play. Our sector gear, very
little play, really nice shimming there. The spur gear, probably about a .1MM, again. And
our bevel about the same as our spur, .1MM. Take it apart one more time. And .1MM on our
spur and bevel. Give that a try, see where we are at. Alright, so we are still spinning
nice and smooth, full contact on all of our gears, really working nicely here. Check out
that play on the spur gears, still a little bit but not what we are going to fix with
shimming. Totally expectable. And our bevel gear, same deal, perfect shimming. So, that's
what we like. Good four-five rotations. On steel bushing, just spin of the finger. Just
what we're looking for. So now that we have our play set correctly. We're going to go
ahead and move our bevel gear around a little bit. Now the trick with the bevel is getting
it to sit, just right with the pinning gear on your motor. So in order to do that, you
want to shim it to about mid way, mid height in the gearbox shell. So, I'm actually going
to go ahead and swap with .01MM from the top side down to the underside of the gear. Just
raise the gear up a little bit, get it more into that midway point and still maintained
good, full contact with our spur gear, on our bevel gear teeth. I'm going to go ahead
and shut this one more time. Alright, still spinning smooth and beautiful, just like we
want. Next thing I'm going to do, is go ahead and install our motor. Again, different for
every gun design. This is going to differ highly, depending which model you are working
on. I'm working on an M4 today, so I'm going to go ahead and install the grip. Alright,
so now that I have my grip installed I can actually see, can't see it on the video there,
but ICS actually cuts a window into their gearbox shells prior to... in the factory.
The purpose of that window, is so that you can see the pinning gear and bevel gear mesh
in here. You can widen this to get a little bit better view. And you can cut it in any
gearbox that doesn't have it already, doesn't hurt the structure at all, but it does give
it that opportunity to get a better view of the pinning and bevel mesh there. Here I'm
going to go ahead and tune my motor by eye here. My motor hight to make sure I'm getting
the best possible mesh on my bevel and pinning gear. That looks about right, right there.
So again, can't see it on the video, but what you are looking for is for the backside of
the pinning gear teeth to line up with the edge of the bevel gear. Get that full contact
once again, you need to shim your bevel up and down from there, or your motor back and
forth, to get that perfect, best mesh. So, go ahead and throw a trigger switch in this
guy. So you guys can hear the results, make sure we don't have any squealing or whining
or anything like that. And ah, show you guys just what a good shim job can do for the sound
of your AEG. Alright guys, so we just got this wire harness installed, got our motor
in, tuning is good, so let you guys hear here. No real squeals or anything-- a little chatter
between the gear teeth, nothing unusual, so our shimming is good, motor tuning is good,
and this thing is ready to be build the rest of the way. So, if you guys have anymore questions
about shimming your own AEG's give us a call or shoot us an email http://www.foxairsoft.com
and we will see you next time. Fox Airsoft
10244 S Progress Lane Parker CO 80134
(888) 316-7816 http://www.foxairsoft.com