Airsoft what is shimming




















A slight amount of movement is acceptable, but try to keep it to a minimum. Once you have the gear where you want it, screw the two halves together and test it again.

If the gear doesn't spin freely, remove a shim and try again. Try to figure out how much of a difference screwing down the gearbox vs just holding down makes so that you can anticipate how many shims you will need in the future. Lastly, you do not have to install every gearbox screw for this test. You only need to use the the two closest to the gear or gears that you are testing.

Now you have the spur gear shimmed you get to the sector gear. You may find it easier to start with just the sector gear and once you are done ad the spur back in. The sector gear has to be shimmed so that it just clears the cut off lever but still meshes with the spur gear. You may have adjust the spur gear if possible to meet the needs of the sector gear. Just keep using the same test technique and do the final test of screwing down the two shell and anticipating the difference between when the you are holding the shells together by hand and when the two halves are screwed down tightly.

There should be enough space between the two gears so that the flats of the gears are not touching one another. The sector gear should just barely hover over the lower half of the spur gear for ideal performance. For the bevel gear, you will want to maximize contact with the spur gear teeth and have proper engagement with the pinion gear motor gear.

The simple way of achieving this is too shim the bevel slightly higher then center and to give it a little more slop then the other gear. Just make sure the spur gear is making full contact when the bevel is pushed up and not binding when it is pushed down.

There is a more advanced technique for shimming the bevel gear which will be mentioned in the next step. There is a more advanced shimming technique that allows you to precisely align the pinion gear AKA the motor gear with the bevel gear for optimum performance. This technique requires you to mount the motor to the gearbox while it is outside of the gun in order to observe how the motor engages the bevel gear. To do this, you would need to attach your gun's pistol grip or motor mount to the gearbox and check the positioning of the bevel gear with the motor engaged.

You would then remove the motor and try to replicate that positioning using shims. I am just mentioning this technique to appease the hardcore tuners out there, but this technique very time consuming and not practical for fast repair shop technicians.

However, for those of you who are building high speed or high velocity guns, it is highly recommended. As a final help I recorded the shim placement used for the gearbox in this tutorial.

Bevel gear- Top: 0. Never try to simple look for an exact placement of shims for any one gun or gear combination. Another person might have the exact gun and gear set that you do, but that does not guarantee that their shim arrangement will work for you.

This is true of any AEG. Becoming proficient at shimming requires lots of practice and patience, but it is an invaluable skill for any airsoft player. If you follow this guide, your shimming should be at least as good as that of any stock AEG. A gun that has been hand-tuned by a skilled technician will likely perform much better than any gun direct from the factory.

Cancel: I did not complete this guide. Badges: It looks like you went in the opposite direction I was taught. You usually want to start with where the bevel gear meets the pinion gear on the motor. When the motor is installed all the shimming would be off, no? Fix Your Stuff Community Store. Difficulty Difficult. Steps Time Required 1 hour. Sections 1. Shims 10 steps. Flags 1. Member-Contributed Guide An awesome member of our community made this guide.

Introduction Shimming is the practice of using small spacers shims to precisely align the gears in an AEG gearbox so that they operate smoothly. Step 1 Shims. Add a comment. Add Comment Cancel. Step 2. Step 3. Step 4. We recommend using 0,1mm thin shims, because of gentle setting of the gaps between the gears and gearbox.

Shimming your gears is not a big science , but if you want to do it in the correct way, you need some time with it. Gears in AEG are mostly three , there can be also four, but we will focus today on the three gear standard.

For better understanding, we will show the shimming of the gears in our CNC split gearbox lower. Picture n. Motor gear has the "Cornerstop", which prevents from overturning the gears when the piston is not fully loaded, with help of anti-reversal latch. For the best performance of the gears, we need a high quality bushings or bearings , the main difference of them and how to use them are in this article , next we will need a shims and vaseline.

For better manipulation and shimming, we recommend to remove most of the gearbox parts. How to do that is in this article. For the cleaning of the gearbox is used Loctite SF cleaner Picture n. We need to remove rest of the parts and change the bushings. The bushings and bearings needs to be installed correctly and they needs to be under the surface of the gearbox.

If the flange of the bushing would be above the gearbox surface, it can cause jamming of the gears. If you have bushings or bearings in the right position, we can start with setting up of the two 0,1mm shims on the center gear for the left side of the gearbox gearbox is divided into two parts, left and right, the markings of the gearbox sides is made by shooters side, because the left side is more complicated and there is installed for example trigger switch.

There must not be anything that could cause the jamming of the gear. Some of the gears could have angle teeth so the left side needs 0,5mm shim or 5x 0,1mm shims. Do not use any vaseline.

Count the size of the gap, remove side of the shell and add on the center gear needed shims. Set all both sides of the gearbox together and screw it. It is more longer procedure, but we can be sure, that this work will have perfect result yes, you can press whole gearbox in your hands, but the results of the shimming can not be precise, that is why we recommend to screw it.

We can see now, if the center gear turns or not, or we can use tweezers and we can push through the bushing and finds out the movement will. If the center gear is not turning around at all , we need to remove at least one 0,1mm shim. This procedure is repeated, until the gear turns around freely and do not have any side will.

This means, that we need to add 3 shims to the left side from the right side, that means that the gear will still move freely, but it will have higher gap from the gearbox. The gear has bigger gap from the gearbox now. After finishing this procedure, we continue on the motor gear. For the left side of the gearbox where motor gear sits, we add at least one more 0,1mm shim more, than on the center gear.

Otherwise the gears would be jamming on themselves. On the angle teeth gears sometimes and on someones , there is a need of more shims, for example 0,3mm 3 x 0,1mm shims. If there is not any gap, the gears would be jamming and that can cause breaking of the teeth on the gears.

Set both sides of the gearbox together and screw them. Like in the center gear scenario, we will do the same with the help of the tweezers and correct any movement will.



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