S&T Vss vintorez AEG Not firing

[Compulsive Reload]

On Wed Jun 20 2018 at 8:52 PM, Iceni said:

Provided the bushing is sat flush on the inside of the shell it won't matter. If it's stuck out into the shell then that will need correcting.

You may have stripped the threads. The only solution for that is to drill and re-tap it at the next size up. Thread taps are pretty cheap and the materiel is soft so it's a simple project. You may even get away without drilling it.

https://www.toolstation.com/shop/Hand+Tools/d10/Engineers+Tools/sd190/Draper+Tap+%26+Die+Set/p10128

The 4mm tap in that kit will re-thread the screw hole. But you will then need a 4mm grub screw!
 

 

[Iceni]

Was it shooting before you took it to bits? It is an important question.

If it has never shot right then the airseal nozzle could be too long.

If however it was shooting before and this is a result of the modifications to the gearbox then you need to address those issues.

I can't help you any more than that ATM because I don't have the answer without that fundamental question been answered, Because the answer dictates the correct course of action to take.

 

[Compulsive Reload]

Was it shooting before you took it to bits? It is an important question.

If it has never shot right then the airseal nozzle could be too long.

If however it was shooting before and this is a result of the modifications to the gearbox then you need to address those issues.

I can't help you any more than that ATM because I don't have the answer without that fundamental question been answered, Because the answer dictates the correct course of action to take.

Click to shrink...

Hello, 

It shot before this, I got it shooting when I first fixed the piston head but I then messed up a gear with the anti reversal latch in the wrong position.

Can't remember if it worked once i installed new gears and piston head though maybe? Think it went off when i tried adjusting motor height as it cut out when testing gearbox and the piston was halfway in, may of been due to battery though as when I swapped it was fine. 

I have noticed a section of the piston has wore off by the track that goes on the gear.

Bbs seem to sit too far down until I push the magazine up, used to feed fine.

Does seem as though the air nozzle sticks out more than it used to, but I could be wrong. 

Thanks. 

 

[Iceni]

It shot before this, I got it shooting when I first fixed the piston head but I then messed up a gear with the anti reversal latch in the wrong position.

Click to shrink...

That was before you noticed the tooth was missing from the spur gear. And then replaced the whole gear set.

It's the sector gear that is probably causing the problem then. The radius of the cam is shorter than the original.

Swap the sector gears over, or grab a delayer chip that extends the radius of the sector gear slightly.

https://www.fire-support.co.uk/product/ultimate-gear-sector-clip-1-piece-16645

That should in theory fix it. As it will pull the tappet plate further back, without affecting how far forwards it moves.

Personally I'd put the old sector gear back in. And re-shim it. It's only just off pulling back far enough.

 

 

[Compulsive Reload]

That was before you noticed the tooth was missing from the spur gear. And then replaced the whole gear set.

It's the sector gear that is probably causing the problem then. The radius of the cam is shorter than the original.

Swap the sector gears over, or grab a delayer chip that extends the radius of the sector gear slightly.

https://www.fire-support.co.uk/product/ultimate-gear-sector-clip-1-piece-16645

That should in theory fix it. As it will pull the tappet plate further back, without affecting how far forwards it moves.

Personally I'd put the old sector gear back in. And re-shim it. It's only just off pulling back far enough.

 

Click to shrink...

Hi, 

I see, Okay I'll throw the old one back in.

Re shim?

cheers! 

 

[Iceni]

Re shim?

Click to shrink...

lol,

Go watch a few video's on gearbox shimming. It's a system of using very thin washers to space the gears correctly. It does 2 things puts the gears in the correct place so they don't rub faces, and removes the side to side motion that gears have.

There are countless threads on it and it's almost an art form. When it is done right the gears spin with less friction, and it significantly reduces gearbox wear and noise. A pack of shims is cheap, but using them is actually much harder than you would imagine.

If you live within spitting distance of Coventry I'd show you how to do it, In fact I'd rebuild that gearbox for you and get it running right.

It might be something you could put up in the wanted section... I'm not sure if they allow for that.

Wanted: Gearbox rebuild teacher: Location. You never know it might get a response.

 

[Compulsive Reload]

lol,

Go watch a few video's on gearbox shimming. It's a system of using very thin washers to space the gears correctly. It does 2 things puts the gears in the correct place so they don't rub faces, and removes the side to side motion that gears have.

There are countless threads on it and it's almost an art form. When it is done right the gears spin with less friction, and it significantly reduces gearbox wear and noise. A pack of shims is cheap, but using them is actually much harder than you would imagine.

If you live within spitting distance of Coventry I'd show you how to do it, In fact I'd rebuild that gearbox for you and get it running right.

It might be something you could put up in the wanted section... I'm not sure if they allow for that.

Wanted: Gearbox rebuild teacher: Location. You never know it might get a response.

Click to shrink...

Oh god sounds a pain. If I was close and had transport I'd probably take you up on that off lmao.

Yeah its definitely an idea as Its beginning to suck the soul out of me haha, can't give up yet though as you have been so helpful! 

Cheers.