Such a detailed tutorial, inside of a gearbox used to be as complicated as cold fusion in my mind but your tutorials have given me confidence, thank you!
What makes this video that much better is how explains what can go wrong if done incorrectly. Other videos lightly touch on the topic with almost a hand wave towards proper shimming, but this video explains why it's important to shim correctly, and what can happen if it goes wrong. It makes you pay closer attention to detail.
you're videos are SUPERB. i appreciate the fact that you used proper terms, you didn't correct yourself, thus making understanding and learning this that much easier. THANK YOU!
this was actually nice and informative i like your patience and how you tried to tell us almost everything and even told us the shims you use in a comment ive bought shims before from a retailer and i literally couldn't tell the difference between the "two kinds and in this video i most definitely saw the difference in your shims
There are a lot of tutorials about shimming which are very good but this has something in plus. It gives you confidence. I was very sceptical about starting to do it myself but now I am faithful. It is somehow an out of the box view of this process. Thank you so much.
Thumbs up! I only had 10 factory shims to start with and I think I still may need 1 more for on top of the sector gear, however it is still sounding much better than out of the box for my King Arms M4! Props to you bud. Thx!
i wouldnt start with the spur gear. then its a hit or miss if the pinion is meshing well with the bevel. you always wanna start shimming bevel to pinion, the bevel to spur, then spur to sector.
Awesome video and a beautiful shim job sir :) . In order to test that Semi-Auto is still functioning after the re-shim, I like to leave the switch assembly and selector plate inside during a shim job. To do so you can pop the trigger in, tighten up a few gearbox screws around the shell. Push the selector plate to the semi-auto position and then pull down on the trigger. With the trigger depressed while also keeping the selector plate in place with a thumb or finger, you can then cycle the gears either with a finger or a flat headed screw driver. If Semi auto is working the gear rotation will come under some pressure (when the sector gear makes contact with the cut off lever); push past the pressure point and you will feel a click.. this is the switch block being flicked out of the switch canal. You can repeat this a few times to make sure it is working consistently.
GREAT VIDEO! Planning on buying my first electric from Airsoft GI. Saw their rework prices. Its crazy how expensive it is. Im the type to tear all my stuff down to know how everything works. This video helped me understand shimming a lot.
Very nice "How-To" ... even i (who never shimmed, cause i got modify gears in a cage;D ) understand in 10min how its work and shimmed a GB very well. Thank you for the tutorial. keep on going with that
Great video. I've known for a while that my AK isn't shimmed properly, when I have the time I'll break it out with this new detailed instruction, thank you chum!
Just wanted t say I enjoyed your video I have been working on guns for years and like to check out new video's because you never know when you might learn something else. Any way to my point this is one of this is one of the best I have seen in awhile. Nice work.
This really helps. I'm shimming my sr25 because I blew a spur gear because I turned the hop too high and kept shooting it like an idiot. Something I already noticed about my gear set is my pinion and sector gear need way more shims than my spur gear because I only needed two 1 mm shims. One on each side. Assemble. I still have to shim the bottom part of the gearbox. There's no play and I will never have a side without a shim. Still need to put shims on the bevil but other than that the bevil to minion is fine. Makes the clicking sound you want.
LOved this video, gave me confidence that I will be able to this for myself now that I'm moving onto AEGs. Only thing I'm missing is a bit on lubing/greasing things up when done for best result (or maybe you ahve other videos on that?)
Now this was a great tutorial im new to teching so i just put shims anywhere thinking as long as they're in the gearbox my gun is fine no wonder my bearings where so lose literally falling in the gearbox i might if even lost shims they're so tiny
A good tip when getting shims for your build, get packs of ore measured shims. From one thou to ten should be plenty of range and you can really fine tune tooth engagement and the smoothness.
guys think about what he's missing. He forgot to mention that your supposed to shim the bevel gear to the pinion gear. The pinion gear is a gear that can't be shimmed so you have to shim the bevel gear to the pinion and everything else off of that. Its just common sense.
This video is outstanding! I love how in depth you go, and you're very clear and precise. Making it easy for someone whos never shimmed before. One suggestion: Add in the parts you use. Just throw in a little tab saying "G&G shims" or something like that. Speaking of which, what type of shims do you suggest, and where did you get them from?
the difference in tightness between setting everything together lose, and when screws are on is very very sensitive. That's why I would every time use the screws regardless. You'll have to try out with the screws anyways eventually. Now, mind you, I've spend a lot of time on this process all together. Of course I had not seen this vid before. So thanks a lot for this. and cheers
I fixed my gearbox that wouldn't fire in semi auto abd in auto it made a weird noise then stoped working so I opened up the gearbox which is a version 2 but plastic and I noticed the delay latch was off from when I stretched the spring so I had to place that latch in the correct spot and now it works in semi and full auto correctly and it sounds alot better plus I increased the fps slightly by stretching the spring this video is very helpful as it helped me understand alot more about aeg gearboxes I could make an aeg myself now but it would be cheaper to buy one and do upgrades on as it makes sence unless you get the parts for a good price
Also, when you insert the motor and the pinion gear, that will have a tendency to push up the bevel gear slightly, so just make sure you factor that in when shimming.
I NEED some assistance/advise putting in an M170 spring. Me, my dad, and my buddy all working together trying to shove the spring in (just a few inches) to the gearbox can't get it in. Should I cut a few of the coils or not since this is a DSG build? Any help is appreciated. Thank you!
That was a very informative video, after watching it I'd feel comfortable enough to attempt shimming myself, i would say though it would have been better to know shim sizes instead of just thick, medium and thinner but can figure it out lol
hi there!! i just bought a used TGM A5 and it came with a problem in the fire selector , when I shoot in full auto the replica keeps firing even if i dont push the trigger. it only happens when i go in fully auto , not in semi. Maybe that be a problem with the gearbox or something?? A friend of mine told me that the fire selector has a coil that can make contact with a plate and that may be a factory issue. Do you know how to repair it or can guide me to some videos that can be handy?? thanks a lot!!
You should do a video on how to do the timing for the spur gear. That still makes no sense to me, but I know if you don't do it correctly then the piston won't do a full cycle.
can the same type of shim be used on bearing vs bushing style gearboxes? and what do you do in the case of VFC gearboxes that have "auto-shimming" gears with the springs? Do you remove those spring shims in favor of traditional shims like this?
Thanks so much this video I'm new to airsoft and I was able to shim my jg m4a1 gearbox perfectly. Keep up the videos. Could you try to do a video installing a MOSFET?
tried with my v3 gearbox. did not work. the cut off lever always makes the secor gear rub on it and slows the rate drastically of how my gears spin. i just put what i had together and took it to the local tech. he did an okay job considering i still hear gearbox whine. but im still using tamiya connectors and stock motor and gears. idk.
New to the game. Excellent and helpful video for myself. Proud owner of a brand new GSG 522 PK Full Metal AEG Airsoft Submachine Gun plane to do the ( m120 or m130 still undecided+other needed parts ) spring upgrade.
Do you think there was alot of friction with the gears when the gear box was bolted down because the gear box itself might have been a little warped due to use on the field, that would explain having a good shim job but when everything is bolted down some gears might have more friction than others? Very good video as well!
You should start shimming with your bevel to pinion gear first, then do your spur and finish with sector to guarantee optimal gear meshing.If you start with the spur then it's a coin flip on whether the pinion and bevel mesh properly if you shim to bevel to the spur.
@ghost21rsst edit; Also having the gearbox tight with only gears in it, wrong! What about cutoff lever, trigger grouping, cylinder, and other parts that can cause the gearbox to flex further apart. This make work if you only have the gear-set, but the other items will make a difference.
What area are you in? I have about 6 guns that I want to get upgraded with the basics. I tried to do some stuff myself and ended having to buy a new gearbox. Of course I’d pay to get stuff done. I just don’t have time to learn any of this stuff, even less time to do it.
bevel to pinion is a better way, plus he shimmed the spur and sector too tight. Even in bushings they should feel frictionless and get multiple rotations with a low force spin. This method created a lot of stress on the bevel and pinion as the bevel being raised only .1mm forces the pinion to be too low and there is minimum contact that way. This also creates noise, when shimmed correctly all you should hear is a low pitched 'thud' from the piston head hitting the cylinder head, no other noise you typically hear in an AEG such as any high pitched noise
10 years later. This is the best shimming tutorial I've seen!!
Now that is what I call a tutorial:) after watching this I would feel confident in tackling this myself. Thank you very much :)
cosmicdonkz yes I concur very well done mate
Very very well explained with a good camera. Finally, thank you!
Such a detailed tutorial, inside of a gearbox used to be as complicated as cold fusion in my
mind but your tutorials have given me confidence, thank you!
can a vise grip or vise be used instead of screwing/unscrewing everytime to troubleshoot shims ?
to truly get the pressure in the necessary parts I would screw it together, the process took me about 5 hours...
+TheLooseCaboose 5 hours? christ
Best tutorial and explanation I have seen! Thank you, sir!
What makes this video that much better is how explains what can go wrong if done incorrectly. Other videos lightly touch on the topic with almost a hand wave towards proper shimming, but this video explains why it's important to shim correctly, and what can happen if it goes wrong. It makes you pay closer attention to detail.
you're videos are SUPERB.
i appreciate the fact that you used proper terms, you didn't correct yourself, thus making understanding and learning this that much easier.
THANK YOU!
this was actually nice and informative i like your patience and how you tried to tell us almost everything and even told us the shims you use in a comment ive bought shims before from a retailer and i literally couldn't tell the difference between the "two kinds and in this video i most definitely saw the difference in your shims
There are a lot of tutorials about shimming which are very good but this has something in plus. It gives you confidence. I was very sceptical about starting to do it myself but now I am faithful. It is somehow an out of the box view of this process. Thank you so much.
thank you so much for the video im currently upgrading a lancer tactical fal carbine with a version 2 gearbox your videos have helped me a lot!
I love your videos, they are so well articulated and explained. Thank you so much.
Thank you for taking the time to make that tutorial. Extremely well done and helpful!
A lot of value in this video. It’s the real deal
Probably the best tutorial I've see. I now know what my next project is. Awesome stuff thank you.
After 7 years still a very good tutorial
Well done helped alot
Thumbs up! I only had 10 factory shims to start with and I think I still may need 1 more for on top of the sector gear, however it is still sounding much better than out of the box for my King Arms M4! Props to you bud. Thx!
Thank you so much for making this tutorial! It was extremely helpful and you explained it very well keep it up!
i wouldnt start with the spur gear. then its a hit or miss if the pinion is meshing well with the bevel. you always wanna start shimming bevel to pinion, the bevel to spur, then spur to sector.
+1 - start with the bevel gear and shim this to the motor pinion.
motor height is far different than pinion to bevel shimming.
Awesome video and a beautiful shim job sir :) . In order to test that Semi-Auto is still functioning after the re-shim, I like to leave the switch assembly and selector plate inside during a shim job. To do so you can pop the trigger in, tighten up a few gearbox screws around the shell. Push the selector plate to the semi-auto position and then pull down on the trigger. With the trigger depressed while also keeping the selector plate in place with a thumb or finger, you can then cycle the gears either with a finger or a flat headed screw driver. If Semi auto is working the gear rotation will come under some pressure (when the sector gear makes contact with the cut off lever); push past the pressure point and you will feel a click.. this is the switch block being flicked out of the switch canal. You can repeat this a few times to make sure it is working consistently.
Never had enjoyed a tutorial video like this, great work!
Thank you so much for this amazing guide! All question I could ever ask have been answered in this video.
GREAT VIDEO! Planning on buying my first electric from Airsoft GI. Saw their rework prices. Its crazy how expensive it is. Im the type to tear all my stuff down to know how everything works. This video helped me understand shimming a lot.
No way this vid is 10 years old and still the best shimming tutorial.
Very nice "How-To" ... even i (who never shimmed, cause i got modify gears in a cage;D ) understand in 10min how its work and shimmed a GB very well. Thank you for the tutorial. keep on going with that
Great video. I've known for a while that my AK isn't shimmed properly, when I have the time I'll break it out with this new detailed instruction, thank you chum!
This is the best shimming guide I've ever seen.
I have to say this is the best airsoft shimming video ever,
This is a most helpful video, thank you very much!!!
this is better than any of the tutorials, well done
Just wanted t say I enjoyed your video I have been working on guns for years and like to check out new video's because you never know when you might learn something else. Any way to my point this is one of this is one of the best I have seen in awhile. Nice work.
I must say, by far the best shimming video on youtube! Thank you! Now I feel confident. :D
Awesome video. Thanks it helped me loads rebuilding my gearbox.
2021 and I just found this page. Thanx 😊
This really helps. I'm shimming my sr25 because I blew a spur gear because I turned the hop too high and kept shooting it like an idiot. Something I already noticed about my gear set is my pinion and sector gear need way more shims than my spur gear because I only needed two 1 mm shims. One on each side. Assemble. I still have to shim the bottom part of the gearbox. There's no play and I will never have a side without a shim. Still need to put shims on the bevil but other than that the bevil to minion is fine. Makes the clicking sound you want.
Superb guide man!
Very well explained tutorial, and nice video quality also.
I practiced my first shim on this exact gearbox lol, it was a cruddy JG filth but it was super easy to shim
LOved this video, gave me confidence that I will be able to this for myself now that I'm moving onto AEGs. Only thing I'm missing is a bit on lubing/greasing things up when done for best result (or maybe you ahve other videos on that?)
Now this was a great tutorial im new to teching so i just put shims anywhere thinking as long as they're in the gearbox my gun is fine no wonder my bearings where so lose literally falling in the gearbox i might if even lost shims they're so tiny
Very, very nice video. Now I realised my gearbox really needs (new) shiming!
A good tip when getting shims for your build, get packs of ore measured shims. From one thou to ten should be plenty of range and you can really fine tune tooth engagement and the smoothness.
guys think about what he's missing. He forgot to mention that your supposed to shim the bevel gear to the pinion gear. The pinion gear is a gear that can't be shimmed so you have to shim the bevel gear to the pinion and everything else off of that. Its just common sense.
This is a really great guide. Thanks for doing this!
Very in depth and helpful. Well done!
This video is outstanding! I love how in depth you go, and you're very clear and precise. Making it easy for someone whos never shimmed before. One suggestion: Add in the parts you use. Just throw in a little tab saying "G&G shims" or something like that.
Speaking of which, what type of shims do you suggest, and where did you get them from?
Great video. Very thorough and very helpful.
the difference in tightness between setting everything together lose, and when screws are on is very very sensitive. That's why I would every time use the screws regardless. You'll have to try out with the screws anyways eventually. Now, mind you, I've spend a lot of time on this process all together. Of course I had not seen this vid before. So thanks a lot for this. and cheers
I love good ol' gearbox videos like this considering I myself am an airsoft internal junkie.
hey man great video! seriously i learned a lot. thanks for posting
I fixed my gearbox that wouldn't fire in semi auto abd in auto it made a weird noise then stoped working so I opened up the gearbox which is a version 2 but plastic and I noticed the delay latch was off from when I stretched the spring so I had to place that latch in the correct spot and now it works in semi and full auto correctly and it sounds alot better plus I increased the fps slightly by stretching the spring this video is very helpful as it helped me understand alot more about aeg gearboxes I could make an aeg myself now but it would be cheaper to buy one and do upgrades on as it makes sence unless you get the parts for a good price
Helpful beyond belief. Thank you.
Also, when you insert the motor and the pinion gear, that will have a tendency to push up the bevel gear slightly, so just make sure you factor that in when shimming.
Great video u deserve more subscribers
Great video. Helped out alot thanks!
Extremely good video. Well worth my time. THANK YOU
Great video. Picked up lots of tips. If you are ever in New Zealand I'll buy you a beer! Thanks.
Awesome tutorial! Thank you :)
I feel confident now i know what i need to look for to perfectly shim it
I NEED some assistance/advise putting in an M170 spring. Me, my dad, and my buddy all working together trying to shove the spring in (just a few inches) to the gearbox can't get it in. Should I cut a few of the coils or not since this is a DSG build? Any help is appreciated. Thank you!
What would I also need to do different if I were to put a dual sector gear instead of the normal sector gear that comes with a gun by itself?
Shimming is a art just like tech work
That was a very informative video, after watching it I'd feel comfortable enough to attempt shimming myself, i would say though it would have been better to know shim sizes instead of just thick, medium and thinner but can figure it out lol
hi there!! i just bought a used TGM A5 and it came with a problem in the fire selector , when I shoot in full auto the replica keeps firing even if i dont push the trigger. it only happens when i go in fully auto , not in semi. Maybe that be a problem with the gearbox or something?? A friend of mine told me that the fire selector has a coil that can make contact with a plate and that may be a factory issue. Do you know how to repair it or can guide me to some videos that can be handy?? thanks a lot!!
I bought some nylon washer from ace. Would those be suitable to use?
such a great explanation! ty so much!
In the places where you got lucky, should you put the thinnest of shims wher none is needed just to minimice friction??
What size screw driver did you use for those screws?
Good job on the helpful video man!
What washers are you using? Like what material and what size.
Would you recommend ball-bearing bushings for a high torque setup? Or would they wear out or break from that?
You should do a video on how to do the timing for the spur gear. That still makes no sense to me, but I know if you don't do it correctly then the piston won't do a full cycle.
can the same type of shim be used on bearing vs bushing style gearboxes?
and what do you do in the case of VFC gearboxes that have "auto-shimming" gears with the springs? Do you remove those spring shims in favor of traditional shims like this?
you also wanna screw the gearbox together in certain areas so youll know for a fact when you tighten the shell together itll still be good.
awesome video!
Thanks so much this video I'm new to airsoft and I was able to shim my jg m4a1 gearbox perfectly. Keep up the videos. Could you try to do a video installing a MOSFET?
tried with my v3 gearbox. did not work. the cut off lever always makes the secor gear rub on it and slows the rate drastically of how my gears spin. i just put what i had together and took it to the local tech. he did an okay job considering i still hear gearbox whine. but im still using tamiya connectors and stock motor and gears. idk.
I feel like I'm listening to Mr. Roger's. Thanks!!
New to the game. Excellent and helpful video for myself.
Proud owner of a brand new GSG 522 PK Full Metal AEG Airsoft Submachine Gun
plane to do the ( m120 or m130 still undecided+other needed parts ) spring upgrade.
Best tutorial ive seen!
Great video thanks for the help
Do you think there was alot of friction with the gears when the gear box was bolted down because the gear box itself might have been a little warped due to use on the field, that would explain having a good shim job but when everything is bolted down some gears might have more friction than others? Very good video as well!
So do you shim with the cut off lever off? And then put it back after shimming?
Awesome video! Thanks!
You should start shimming with your bevel to pinion gear first, then do your spur and finish with sector to guarantee optimal gear meshing.If you start with the spur then it's a coin flip on whether the pinion and bevel mesh properly if you shim to bevel to the spur.
New to airsoft... getting a CYMA CM028. I want to attempt to shear those gears with this video.
@ghost21rsst edit; Also having the gearbox tight with only gears in it, wrong! What about cutoff lever, trigger grouping, cylinder, and other parts that can cause the gearbox to flex further apart. This make work if you only have the gear-set, but the other items will make a difference.
What area are you in? I have about 6 guns that I want to get upgraded with the basics. I tried to do some stuff myself and ended having to buy a new gearbox. Of course I’d pay to get stuff done. I just don’t have time to learn any of this stuff, even less time to do it.
thx this help me a lot
Cheers its getting me closer to reviving my mph5
just use both hands on one screen at a time. slow, and steady wins the race
Still a very good tutorial
Anybody no where o find a "sector shim"? I misplaced that little ring and am wondering where to get a replacement.
Thx for the video,good tuto !
Great video thanks
awsome video
What's the inner Diameter on those shims?
Absolutely superb. I can't think of any way that could have been done better.
bevel to pinion is a better way, plus he shimmed the spur and sector too tight. Even in bushings they should feel frictionless and get multiple rotations with a low force spin. This method created a lot of stress on the bevel and pinion as the bevel being raised only .1mm forces the pinion to be too low and there is minimum contact that way. This also creates noise, when shimmed correctly all you should hear is a low pitched 'thud' from the piston head hitting the cylinder head, no other noise you typically hear in an AEG such as any high pitched noise
thnx! nice and clear.
simply perfect tuto..........
Why you don't press-in bushings first?