AEG fires at random

[coach]

Yeah. The first actual full tooth is what people refer to as the second tooth that you grind off. But sometimes it's also the first tooth.

Confused yet? Can I make it worse for you?

[mike_sinyard]

Originally Posted by coach

Yeah. The first actual full tooth is what people refer to as the second tooth that you grind off. But sometimes it's also the first tooth.

Confused yet? Can I make it worse for you?

haha i understand. i got it right, just the numbering of the teeth i didnt have right
now when im refering to shaving the fist tooth off, its actually the second lol i probably confused people

Like i said Hectic watch that youtube video, you can sckip most parts until he gets to the piston part

[Hectic]

I alrdy got it all tore apart. Tommorow ill pester jugglez and grab some parts and check everything again befor i reassemble.
Yeha i seen that video. Thats what i was sayin the first tooth on the sector has to grab the first/big/pickup/engagement tooth (we need a standard name for this tooth lol) cleanly and meshes with the rest of the teeth without tryin to chew em up or grab em ahead of time.

[Hectic]

Is it just me or this alrdy has at least one tooth shaved?

[mike_sinyard]

yes some pistons come like that

[pestobanana]

The standard name for that tooth IS the pickup tooth.

It seems like the general consensus is an AoE issue. So how does damage like that happen without any sign of wear on the pickup tooth, 2nd tooth or release tooth? The release tooth looks perfectly fine, a release tooth failure results in stripping of the entire piston rack not just damage to the front few.



I've seen similar damage but to a much lesser extent on one of my Modify pistons. The gun still worked fine, but it was caused by a worn out bushing, so make sure your bushings are perfect.

[Hectic]

I actually figure that the stripped piston is a result of the last tooth (the metal one at the head end of the piston) failed. It looks in tact in the pic i posted and it actually is but it is broken off of the rack and if you put pressure on it it will lay out almost flat and press into the piston allowing the piston to slip forward befor the sector is finished its cycle so the last tooth of the sector would drag along the piston a bit stripping those gears.
Aoe was good piston, not so much lol
Edit if you look closely at the front of the metal tooth you can see the crack and if you wher to push on the metal tooth it wobbles and will lay out flat if pushed towards the other teeth

[mike_sinyard]

your piston crapped out on you... sucks but buy a new one and youll be alright. Lonex?

[pestobanana]

I guess it just wasn't clear in the image.

You should do well with a Lonex piston. I have one in one of my guns, but what really impresses me is my Modify Quantum Piston in my DMR, it's been in there for almost a year and the piston still looks pretty much brand new if I clean off the gear grease. Don't use this piston unless you have a high quality gearset, the reason the piston still looked new was because the titanium coated steel teeth were harder than my gears and very slowly wearing away at the pickup tooth on the sector gear.

[zone 69]

Originally Posted by Hectic

I actually figure that the stripped piston is a result of the last tooth (the metal one at the head end of the piston) failed. It looks in tact in the pic i posted and it actually is but it is broken off of the rack and if you put pressure on it it will lay out almost flat and press into the piston allowing the piston to slip forward befor the sector is finished its cycle so the last tooth of the sector would drag along the piston a bit stripping those gears.
Aoe was good piston, not so much lol
Edit if you look closely at the front of the metal tooth you can see the crack and if you wher to push on the metal tooth it wobbles and will lay out flat if pushed towards the other teeth

WoW, That's the first time I seen a piston fail there.

May I ask what spring your pushing.
I think some time's people expect to much from stock part's.
Not pointing any fingers.

[MaciekA]

Hectic, you've got smoking-gun evidence of PE, so don't let yourself get distracted by the discussion around weak pistons and AoE. You need a strong piston, you need to correct AoE, but the reason your orange piston failed was because you've had PE (pre-engagement).

The reason for PE in your case could be anything, but it can be caused by too weak of a spring, a heavy piston, or a piston that had trouble moving along the rails. You might have also had a BB jam in your hopup chamber and you kept firing full auto (if your gun was a little off its rocker, this could have easily happened).

All of those things can cause PE. In your next refresh of this build, solve AoE, get a strong piston, but make sure you've prevented pre-engagement. If you put in a slightly stronger spring but steal away volume using a sorbo pad (which you'll need for AoE anyway), you can neatly tie up both of these problems with a single solution.

+1 on the lonex red pistons. Don't forget to check that yours moves up and down the gearbox nice and easy!.

Also Hectic, Stealth, let's all chat about this at Finch's on Sunday

[Stealth]

Originally Posted by MaciekA

Hectic, you've got smoking-gun evidence of PE, so don't let yourself get distracted by the discussion around weak pistons and AoE. You need a strong piston, you need to correct AoE, but the reason your orange piston failed was because you've had PE (pre-engagement).

The reason for PE in your case could be anything, but it can be caused by too weak of a spring, a heavy piston, or a piston that had trouble moving along the rails. You might have also had a BB jam in your hopup chamber and you kept firing full auto (if your gun was a little off its rocker, this could have easily happened).

All of those things can cause PE. In your next refresh of this build, solve AoE, get a strong piston, but make sure you've prevented pre-engagement. If you put in a slightly stronger spring but steal away volume using a sorbo pad (which you'll need for AoE anyway), you can neatly tie up both of these problems with a single solution.

+1 on the lonex red pistons. Don't forget to check that yours moves up and down the gearbox nice and easy!.

Also Hectic, Stealth, let's all chat about this at Finch's on Sunday

Alright you might be taking me to school on this, but a sign of PE would have the piston wear/damage near the rear of the piston, not the front near the release tooth.

[Stealth]

My money is on piston getting stuck on rails.

I don't possibly see how AoE is corrected without removing a second tooth. It's just impossible. That being said, notice how there's very little damage to the second tooth?

In this scenario, the sector would try to pull back the pick-up. It would jam into the second tooth, slip, and attempt the entire pullback process.

Piston makes it almost to the end before it gets stuck. The gears power through it all. Notice how the front is stressed to hell.

Piston is released but gets stuck or slows at the very same position.

The sector gear is coming around again for a second pull-back. Instead of engaging at the at the first tooth, it starts pulling back somewhere at the position of the shredded teeth. Cycle repeats.

This would have been super evident with a chrony. If you're doing gun doc work, get one.

TL;DR: Piston gets stuck. Hectic somehow short strokes his system.

John

[Hectic]

No damage at all on the rear teeth of the piston just some lil bits of loose cral there. The seccond from the front is actually sheered right off just like the next ones are. For the heck of it i practiced shaving teeth on the old piston so it looks like hell now at the back but im sure what happened was the metal tooth failed causing the piston to slip forward one tooth and as the sector was still tryin to complete the cycle the piston was trying to start its forward jurney thus causing the damage you see. The aoe wasnt "corrected" really it was just alrdy lined up nicely so i didnt see any need to shave the teeth.
In hind sight the day i tryed to game it it was coold and i did get a jam or two and during one i got 3x3round bursts try to go off on their own so that likely is what killed that first tooth.
Hopefully ill have it running for sunday but ill bring that old piston so you can see what i mean about the metal tooth.

As for spring its the stock echo1 spring (useually they run the stock piston for quite a while)
Just my bad luck on this gun after i get this one running ima stick to external adons and gbb's me and gesrboxes seem to not get along sometimes lol.

[mike_sinyard]

Wtf mate. Is everyone going to this game on sunday?