How to Shim an Airsoft Gun
How to Shim an Airsoft Gun
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How to shim your gears
15. 09. 2018
Our shop started the offer of our own gearbox shims recently. The shims are used to correct the movement volition/gaps of electric airsoft gun between gear and gearbox. Our shims are manufactured from plated steel and they are 0,1mm sparse. We do not recommend using shims made from non-ferrous metals (for case copper or zinc), because fifty-fifty shims are under pressure level and they can cause destroying of the gears by for example: jamming the shim or cut information technology. Thats why we bring to you this guide.
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 large science, but if you desire to do it in the correct mode, yous need some time with it. Gears in AEG are by and large 3, there can be also four, just we will focus today on the three gear standard. For better understanding, we will evidence the shimming of the gears in our CNC carve up gearbox lower.
Picture n.1 - Motor gear is located closest to the motor and deliveres the rotation from the motor to the center gear, this gear has also the highest rotations. Motor gear has the "Cornerstop", which prevents from overturning the gears when the piston is not fully loaded, with help of anti-reversal latch.
Pic n.2 - Center gear deliveres rotations from motor gear to the piston gear.
Movie due north.3 - Piston gear deliveres rotations from the center gear to the piston.
For the best performance of the gears, nosotros need a loftier quality bushings or bearings, the main difference of them and how to use them are in this article, adjacent we will need a shims and vaseline. For better manipulation and shimming, we recommend to remove nearly of the gearbox parts.
Picture n.4 - Lower par of the split gearbox, before alter of the gears.
Correct guide for the shimming of the gears
First step is always full cleaning of the gearbox and correctly installing of the bushings/bearings, by stamping or glueing. How to exercise that is in this article.
Picture n.5 - Removed trigger switch and gears from the gearbox. For the cleaning of the gearbox is used Loctite SF 7063 cleaner (Moving picture n.6).
Picture n.7 - Cleaned gearbox. We demand to remove rest of the parts and change the bushings.
Moving picture n.8 - Installed bushings with combination of the bearings on the motor gear.
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 higher up the gearbox surface, it can crusade jamming of the gears. If y'all have bushings or bearings in the right position, we tin offset with setting upwards of the two 0,1mm shims on the heart gear for the left side of the gearbox (gearbox is divided into ii parts, left and correct, 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).
Picture n.9 - Right minimal movement will between center gear and gearbox.
There must not exist anything that could cause the jamming of the gear. Some of the gears could have angle teeth then the left side needs 0,5mm shim (or 5x 0,1mm shims). Practice not use whatsoever vaseline.
Picture due north.10 - Zero gap = jamming of the gear to the gearbox.
Pic n. 11 - Prepare the both sides of the gearbox together and check the gap. Count the size of the gap, remove side of the trounce and add on the centre gear needed shims.
Prepare all both sides of the gearbox together and spiral it. It is more longer procedure, but we can be sure, that this work will have perfect result (yes, you tin press whole gearbox in your easily, just the results of the shimming can not be precise, that is why nosotros recommend to screw it). We can meet now, if the center gear turns or not, or we tin can use tweezers and we tin can button through the bushing and finds out the motility will. If the center gear is not turning around at all, we need to remove at least 1 0,1mm shim. This procedure is repeated, until the gear turns effectually freely and practise non have any side volition.
Picture north.12 - In our case, the gears have also loftier shafts and they look out from the bushing, that is why nosotros need to change the ratio of the shims. This means, that we need to add 3 shims to the left side from the right side, that means that the gear will nevertheless movement freely, but it will have higher gap from the gearbox.
Picture n.13 - Different ratio of shims instead of original program. The gear has bigger gap from the gearbox now.
After finishing this process, nosotros keep 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, than on the center gear. Otherwise the gears would exist jamming on themselves. On the angle teeth gears (sometimes and on someones), there is a demand of more shims, for example 0,3mm (iii x 0,1mm shims).
Moving-picture show n. 14 - Shims on the motor gear.
Picture due north. 15 - Most important is the gap betwixt center and motor gear. 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 spiral them. Like in the center gear scenario, we will exercise the same with the help of the tweezers and right any movement will.
Later this procedure, spiral the gearbox together and notice out, if the both gears turns around freely, if not, remove the shims from the motor gear, until it is turning around freely without any side will. Important part of this is to accept care and expect on the both gears, the gears must not be jamming together, because that would cause more pressure level on the motor and the gears could grind out steel dust into the gearbox. Utilize this procedure until your gears plough effectually freely without whatever side will in the screwed gearbox.
For the last gear, nosotros apply similiar procedure. Add at least ane 0,1mm shim more (than on the middle gear) on the piston gear to the left side of the gearbox, set both gearbox parts together and screw them. Information technology is of import for the piston gear that it would not rub the gearbox border and add enough shims, and then there are enough gaps between gears and gearbox.
Picture n. 16 - Final gap between piston gear and gearbox which we fill up with shims.
Moving picture n. 17 - Bank check with tweezers through the bushing if there is will in gears. The screws must be tightened (Picture northward.18). If you did everything correctly and with care, there should not exist whatsoever, or minimal (healty) will.
Correctly shimmed gears should run perfectly without resistence, even on the bushings. This video shows shine gear run WITHOUT THE VASELINE. Afterward lubricating with vaseline, in that location will be even lower resistance on the gears.
During shimming process, there could be situation, where the gear without shim has move will and subsequently adding shim, it will plow around badly. We recommend in this scenario skip the shim and let the gear take the "healthy movement will", than hardly tight shimmed gears. Subsequently shimming procedure we recommend to "mucilage" shims with vaseline on the gear shafts, because you need to remove gears for installation of the other inner gearbox parts and you lot can not driblet them by this way.
Next video shows upwardly the spin around of the gear with pressured air. It is the final proof, that the gears spins freely without jamming.
Concluding thing is the lubricating of the gears. Utilise a thin layer of vaseline on every parts of the gears where they connects together or where they touch together, for example sharfts, teeth etc. There is no demand of lubricating of the gear basic surface. Overlubricating is releasing during fourth dimension into the gearbox and tin can cause short circuit for example in the procedure unit/ECU, if it is integrated in the gearbox. In our service center we utilize Loctite 8103 vaseline (Motion picture n.nineteen).
Considering of huge variations of the gears, made with different tolerations with different sizes, peak of the shafts, there does non exist an verbal guide or count, for the used shims on the direct gear. This guide is just for explaining purpose. Direct count or configuration of the shims depends on many factors. Vaseline can exist used almost everyone, but non silicon one, which has huge density and has glue upshot. Silicon vaseline is used generally for isolating of the electrical sources, thats why we exercise non recommend to use information technology for the rotational parts. There is no need of overlubrication, only thin layer of vaseline on the parts where they touches or work together is enough.
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How to Shim an Airsoft Gun
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