Experienced guntechs advice needed.

[Amos]

Hey there... My current gun is having a multitude of different issues...

It's a Real Sword Type 97B... and it doesn't use any standard gearbox it uses a proprietary one...

Now I'm hoping you could suggest something based on the symptoms I'm having...

I recently opened my switch box and realized that the little trigger contact had melted a little bit... I heated it and re-molded it back into its original shape.. and now it's actually firing..

But... now when I'm firing in semi, it's doing a 2 to 3 shot burst... at first I thought the motor might be over-torquing it... so I swapped the spring for a 430 FPS one.. and it's still doing the same thing...

The gearbox uses all the standard principles, an AVR, a cut-off lever, piston, cylinder ect ect ect..

What could cause this 3-4 shot burst thing to happen?

[ujiro]

Well, 3-4 burst, sounds like the cutoff lever is perhaps getting caught up on something, or is somehow being hindered so it isn't cutting off the switch after just one cycle. I would check its mobility to see if it is completely free moving. Sounds weird though... I am getting 2 shot burst now, but only when I use a large 10.8V battery so it is overtorquing or something curious.. But that sounds like its obviously independent of that since the stronger spring didn't do anything.

[Amos]

Yea.. My motor seems to be getting abnormally warm.. and it's 3-shot bursting on a 8.4 3300MAH Large.... so I'm thinking a bound cut-off lever seems probable...

This gearbox has a bit of the lever exposed.. I've tried manually "Cutting off" the gears as they've been turning.. but I'm not sure that would do anything...

I think I'll go tear everything down and build it back up again.. that may change something.

Any more suggestions would be awesome.

[mcguyver]

Is the switch contact block moving freely? If you have had to re-melt things, is there any flash that's getting caught up and holding those contacts closed?

[ujiro]

Yeah that was going to be my next thought. Could be its somehow not releasing right away. But that also sounds like something that would be intermittent and/or would be fixed after a few shots as it would bend back into shape. Although actually if the plastic carrier/follower was out of shape, I suppose it could easily be caught on its way back and stay held with the switch closed... Check the mobility of the switch then too, when you pull the trigger then release.

[Amos]

Well, the trigger contact was binding a little bit, so I loosened the screws on the box that's holding everything together.. Everything's moving nice and freely, but it's still 3-4-5 shot bursting.

When the trigger goes forward there is a little bit of sparking, but it's not getting held forward.

My cut off lever is moving completely freely with no signs of extreme wear. I've used this gun maybe... 6 times, 4 of those were at 250 FPS, and the other 2 were at 390 FPS (The guns comes shooting 450 stock)

Only thing I've noticed was my Systema V3 Spring guide (end plate changed out for the one needed for the 97B) is horribly bent... but that doesn't effect anything.



I'm thinking the problem lies within the trigger contacts.. but... any more suggestions on how things should be set up would be helpful.

I'll re-assemble then make a video of what this thing is doing.

[ujiro]

The only other thing I can think of is maybe as soon as it sparks and contacts, its almost tacking/sticking together due to the spark having maybe melted a small spot on the contacts that momentarily sticks. But that seems doubtful.

[Skladfin]

try opening up the two contacts alittle more.

I had exactly the same problem and it worked

[Amos]

Well.. I built it up and tore it down about 3 more times... and now it's working perfectly...

... I blame Gremlins.

[cdn-mfg-AirsoftAssault.com]

I hate Gremlins. I think they ate my dog once

[Skruface]

Originally Posted by Amos

... I blame Gremlins.

Keep your gun out of the water, and don't feed it after midnight. These are the keys to a gremlin-free gun.

On another note, WTF happened to that spring guide to warp it like that? I've never seen that before....

[Amos]

Originally Posted by Skruface

Keep your gun out of the water, and don't feed it after midnight. These are the keys to a gremlin-free gun.

On another note, WTF happened to that spring guide to warp it like that? I've never seen that before....

... I have no idea... There's a chance it came like that and I just didn't notice...

Orrrrr.... it didn't click into place properly/jumped when I tripped the ARL and got caught on the thing that holds it in place when I was trying to remedy my 4 shot burst with a 450 FPS spring..

I wanted to use a modify one.. but you need to be able to un-screw the back and replace it with Real Sword's little back-plate thing.

This gun's awesome when it works right.. for a 365mm barrel I'm getting about 20 feet less than my beatly VSR-10

[CJay]

Just a quick input from someone who's had this problem recently. If ur getting sparking at the contacts on semi block it means there's some arcing of the connections. Ur gonna get residue of oxidated metals building up. Plays havoc with ur switching assembly specially on batteries that are high current output. I needed to clean the metal contactsevery game after I upgraded to a lipo or semi became burst just because of that damned residue. I've since switched to a trigger master to reduce the current flow thru the trigger switching assembly and problem is fixed. I've not heard of any mechanical fix for it though :S

[ujiro]

No mech fix for that, that's how it goes with standard switch types with the full current flowing through there. Nothing you could do apart from a mosfet system, or somehow building your own curious switch assembly.

[Amos]

Bah. As soon as I get a bit more money.. I'll be picking up a trigger master.