Undercorrection is almost always better than over correction. There is an "ideal" spot for the pickup to engage at (and its definitely further forward than 12 o'clock), but going even the slightest bit past that point is immediately losing the benefits of AOE correction. As mentioned in the video, the lift of the piston is an increasing issue as teeth are removed from the rack. Higher spring strength (like that of DSG or sometimes DMR) begs the need for AOE correction as you put more stress on the gear teeth with higher ROF. The balancing act comes in how much tooth removal you need in order to achieve the AOE needed to keep your pickup tooth healthy without putting too much stress or allowing the piston to lift up and cause damage to the next couple teeth on the piston rack. In most full stroke SSG builds, I would wager you really only need to AOE correct to the point where the second piston tooth is reduced or fully removed. Having the second and third teeth totally removed is way too much.
The biggest issue I've found with AOE correction, is that people are doing it *too much* which 'fixes' the original issue, but replaces it with new ones, evidenced here in this video. Doing minor corrections to prevent the first tooth from engaging at a bad angle is fine, but automatically assuming every gearbox ever made has to be adjusted to 12 o'clock is just silly. I'll be honest though, seeing the piston getting pushed upward was new to me, after seeing it, I'm pretty sure a lot of my old plastic tooth pistons were stripped because of this very issue. I corrected AOE too much. Going forward, I think I'm going to just avoid AoE correction entirely, or do it at a minimum.
@@adzzzysarmoury well youve explained it well - summary: you just need to ensure that your maximising surface area of pickup, that way all teeth on the rack have load distributed evenly among them relatively, doesnt matter what time, 12 o clock is not needed haha!
Someone said eating tiger testicules is good for your sexual health, so, people started hunting tigers and eating its balls..... Someone said you have to correct your AOE, so people started to correct the AOE. Most people dont realize teeth arent flat, its a triangular shape, it means that if your sector gear first pick up tooth is at 12 oclock it is not marrying perfectly with your piston pick up tooth, its not doing full contact between both teeth, and even less people think about that point, were your teeth are engaging, it is under the lowest pressure possible, the spring is really soft at that point, it doesnt make any harm if the teeth dont match perfectly at that point!!! Thats why you only have to correct your AOE if you are building a high stress gun, with a really heavy spring, or if you are working on a ICS, those things come from factory with a terrible AOE and they eat pistons like nothing, same happens with all the support machine guns 249/240/m60.
In my view you are absoliutely right. The most important thing in my vie are the full contact not only on the first teeth but also in the second and the third one. So, in my view is rather more important to have more teeths with full contact then the first one with an amazing contact but the remaining of the teeth ate shit.
Although I am also against exaggerated aoe correction, I have to say those 14T shs rectangle hole lightened pistons in your examples are notorious for off spec tooth spacing that causes the bad meshing that you showed.
Well I can tell you that I'm verry recent in tech in airsoft but I'm sure of one thing to me it doesn't make sense to do an aoe correction at 12h. Because the connection between the piston teath and gear should be perfect and therefore the point where it starts might not be at 12h position. If you always put at 12h position then you will have the motive to remove teaths from the piston but if you put at 13h or 13h30 position then you might not needed. Another thing by putting a sorbo pad you are reducing the air volume.
Everyone worries about the first teeth in the pinion and gear that take the least force, and no one cares about the last teeth that must hold the force of a maximally compressed spring.
it seems like 12 o'clock position is not the way to go. As i understand the main purpose for aoe should be seeking of the full contact position in-between piston and gear and that's is simply not possible because of the form difference of them - look, they simply do not match, tooth of sector gear has a sharp (looks like an arrow head) angle and the tooth of the piston is straight. Plus, the piston is way too back on 12 o'clock so the following teeth begin to shatter as they are not properly picked up beacuse the 2nd tooth is gone - this basically reduces the point of such aoe to zero. That's why i lean more to 1 o'clock/12:30 (lol) aoe - it still has enough contact surface and does not fuck up following teeth so the piston is properly picked up in the motion.
Tottally agree with you mate. When im in the mood of doing the things "perfect", i file away the piston pick up tooth so it is slighlty on an angle, it avoids the sector gear pick up tooth to slam against a corner, because some pistons have huge flat pick up tooth, AOE will not fix that issue, filing and "shape" the tooth will help way more, ive seen some piston racks with that angle from factory too.
the standard 12:00 AOE versus the factory AOE... Is there a sweet spot for the first rack tooth or a formula of parts so to line up a position in relation to the axle of the toothed gear?
why is the 3rd teeth taken off too? From the previous techs that advocate the 12oclock AOE assumes the 3rd tooth is present that picks up the 1st (pickup) and 3rd (sometimes half tooth) at the same time at around 12oclock or 11:30.. I agree that the 12oclock AOE does not apply to 2nd & 3rd tooth taken off
if its not done right it will often ruin the gun. I'd rather have under correction or none at all than an overcorrected gun. most guns don't even need it. none of my guns have it and they all run fine save for my cyma aks74u which is 100% a dirty gearbox interfering with the aster but the plastic teeth are probably fine. it doesnt use a metal rack. it's always with sorbo pads. they also reduce volume and in a dmr like my sr25 and high speed cqb builds, you need air volume more than ever. at least with a high speed cqb build you can put a faucet washer between the piston and piston head. you still lose volume buy you most likely have a ported cylinder or it's short stroked but on a dmr, if you want to Thow anything heavier than a .36' you need the volume. especially on any gun that isn't a svd or sr25 which you still can't afford to lose volume because reverse joule creep on heavy ammo. my cyma platinum mp5 is short stroked from the factory by 4 teeth and that's another good example of why my guns isn't aoe corrected. of course, on a full stroke full cylinder gun there's no reason you can't do it the old fashioned way.
i think you got confused there: issue in your pistons is not AOE, its rather the pitch difference between sector gear and piston rack; you have some faulty pistons there, where the rack is not matching properly with the sector, nothing to do with AOE. the linear pitch of the piston rack does not change based on the angle with the sector..
It's caused by the missing teeth on the rack. Normally the sector gear would have 1 or 2 teeth engaged at a time. With the AOE cut you're skipping 2 teeth on the sector. That means the 1st tooth is driving for 3x the distance it's supposed to. As that tooth rotates, it gets "shorter" in relation to the rack because it's a circular gear (the tooth is dropping down, away from the rack). So, it cannot produce a linear amount of travel on the rack across its entire engagement. The rack travels farther/faster the closer that 1st tooth is to vertical orientation. Without the AOE cut, the #2 & #3 teeth take over as primary drivers as the 1st tooth starts to fall away. This results in consistent travel of the rack. What you get with the AOE cut is a rack that does not travel quite as far rearward while being driven by a single tooth, so when the #4 tooth comes around to engage the rack, it is out of alignment, and they don't mesh properly. For AOE cut to work properly you'd need a custom rack where the #1 rack tooth is ever so slightly closer to the #4 tooth position.
