half compressed piston after shooting semi-auto, is that normal?

Gunny_McSmith · May 22nd, 2009, 11:56

Hi, I recently openned my Version 2 gearbox to install a new wiring kit, and I noticed that after putting it back together, when I shoot semi-auto, after a full cycle, the piston gets locked about halfway back..... but the gun can still shoot normally, without any problem, but I was just wondering if that was normal?

Styrak · May 22nd, 2009, 12:52

No that's not normal. It should be decompressing almost fully after a semi shot.

Gunny_McSmith · May 22nd, 2009, 13:04

do you know how it could be fixed?

BTW : by saying almost fully decompressed, does that mean that the tappet plate should be completely forward when you look down the feeding area? after each shot on smei?

ShelledPants · May 22nd, 2009, 13:29

If you're using a 9.6 large battery (or equivalent) there may be too much power for the cut off lever to activate before the gears have enough time to half cock the gun. This isn't necessarily a "problem" with your mechbox, but rather a kink in the setup you're using. Try shooting with a weaker battery (8.4 mini or 8.4 large) and see where your piston lands. Otherwise it could be a sticky cutoff lever. Just my thoughts.

Skladfin · May 22nd, 2009, 13:32

Yes, that is normal if you are using a battery that is fairly strong such as 9.6v or higher. The same problem always happens with Lipos.

Shelled pants has nailed this problem, do what he says

hope that helps

Gunny_McSmith · May 22nd, 2009, 13:36

yup you guys were right.... thats because of the G&P crane stock battery....(9.6V with 2200 mAh....)

problem solved....

thx again

ujiro · May 22nd, 2009, 23:31

Yeah, it can even get worse. I get 2 shot burst when I use my 10.8V 5000mAh... lol.

AngelusNex · May 22nd, 2009, 23:34

Quote:

Originally Posted by ujiro

Yeah, it can even get worse. I get 2 shot burst when I use my 10.8V 5000mAh... lol.

My eyes, they bleed.

Amos · May 22nd, 2009, 23:42

If my AEG is gun's running under 350 FPS and I use my 8.4 4700 battery I get 3 shot burst

Real-sword motors have an INSANE amount of torque.

ThunderCactus · May 23rd, 2009, 02:03

It's totally normal, I call it cycle overlap
Your gears maintain momentum and can pull the piston back by themselves, this is especially apparent with larger batteries or heavy prometheus gears. Infact if you get a powerful enough battery, or charge your battery right to its limit, you can get 4 shot burst on semi!
My own M4 gets about 1.3 cycles on a semi shot
The only time I found this to be a nuisance is on the trigger master, it takes that 1.3 cycles on semi and puts that exact current through the motor for semi, but on 3 shot burst it'll put around 3 times that power through so you'll often start out with a 4 or 5 shot burst. Not like it's a big deal you just reduce the burst length

And since we're on the subject, theres also burst overlap, in which each burst is more than 3 cycles (like 3.2), so every 5th burst you'd get a 4 shot burst. Again, also solved by reducing burst length.

incrediboy729 · May 23rd, 2009, 02:37

Quote:

Originally Posted by Sepulcrum

My eyes, they bleed.

WORD. 5000mah???? what brand of cells???

Styrak · May 23rd, 2009, 04:00

Quote:

Originally Posted by incrediboy729

WORD. 5000mah???? what brand of cells???

Probably Elite. Which makes them even more powerful, lol.

ujiro · May 23rd, 2009, 17:08

Quote:

Originally Posted by Styrak

Probably Elite. Which makes them even more powerful, lol.

He is correct lol. I don't run full auto with it though, semi only. And will be installing home made mosfet system so as to not rape the switch assembly (which it already has lol).

It is dirty though. I get more than 20 BB/s on full auto, with an M120.

Edit: using a crappy motor at that. I plan on buying a guarder infinite torque up, or if I feel like spending more, a Magnum.

incrediboy729 · May 23rd, 2009, 18:03

Quote:

Originally Posted by Styrak

Probably Elite. Which makes them even more powerful, lol.

Seriously, i have an elite 10.8v 1500mah 2/3A cell and it's very powerful (best battery i've ever bought btw). I though elite only made batteries up to 4500mah but maybe there's some new SC cell i haven't heard of.
"Oh you are having trouble with your battery? That's a shame.....I've only had to charge mine once"

To answer the original question, yes it is normal. I'm not sure if this is ok or not so maybe somebody else can verify, but you can just barely tap the trigger and get it to go forward into the full forward position. I do it sometimes.

ThunderCactus · May 23rd, 2009, 20:15

actually I think Riley got his battery made out of the very first shipment of 5000mah batteries to arrive at prairie battery
these are BRAND NEW cells, just got on the market lol

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May 22nd, 2009, 11:56	#1
Gunny_McSmith a.k.a. Palucol Trader rating Join Date: Mar 2008 Location: MTL	half compressed piston after shooting semi-auto, is that normal? Hi, I recently openned my Version 2 gearbox to install a new wiring kit, and I noticed that after putting it back together, when I shoot semi-auto, after a full cycle, the piston gets locked about halfway back..... but the gun can still shoot normally, without any problem, but I was just wondering if that was normal?

May 22nd, 2009, 12:52	#2
Styrak Trader rating Join Date: Jan 2007 Location: Saskatoon, SK	No that's not normal. It should be decompressing almost fully after a semi shot. __________________ Airsoft Sales and Repair/Upgrade Services

May 22nd, 2009, 13:04	#3
Gunny_McSmith a.k.a. Palucol Trader rating Join Date: Mar 2008 Location: MTL	do you know how it could be fixed? BTW : by saying almost fully decompressed, does that mean that the tappet plate should be completely forward when you look down the feeding area? after each shot on smei? Last edited by Gunny_McSmith; May 22nd, 2009 at 13:07..

May 22nd, 2009, 13:29	#4
ShelledPants Trader rating Join Date: Feb 2008 Location: Toronto, On	If you're using a 9.6 large battery (or equivalent) there may be too much power for the cut off lever to activate before the gears have enough time to half cock the gun. This isn't necessarily a "problem" with your mechbox, but rather a kink in the setup you're using. Try shooting with a weaker battery (8.4 mini or 8.4 large) and see where your piston lands. Otherwise it could be a sticky cutoff lever. Just my thoughts. __________________ Ár skal r?*sa, sá er annars vill fé eða fjör hafa. Sjaldan liggjandi úlfur lær um getur né sofandi maður sigur.

May 22nd, 2009, 13:32	#5
Skladfin Trader rating Join Date: Dec 2006 Location: Glace Bay, Nova Scotia	Yes, that is normal if you are using a battery that is fairly strong such as 9.6v or higher. The same problem always happens with Lipos. Shelled pants has nailed this problem, do what he says hope that helps

May 22nd, 2009, 13:36	#6
Gunny_McSmith a.k.a. Palucol Trader rating Join Date: Mar 2008 Location: MTL	yup you guys were right.... thats because of the G&P crane stock battery....(9.6V with 2200 mAh....) problem solved.... thx again

May 22nd, 2009, 23:31	#7
ujiro Trader rating Join Date: Aug 2006 Location: Burlington, ON	Yeah, it can even get worse. I get 2 shot burst when I use my 10.8V 5000mAh... lol. __________________ I love freedom and consequently America

May 22nd, 2009, 23:42	#9
Amos Trader rating Join Date: Aug 2006 Location: Japan	If my AEG is gun's running under 350 FPS and I use my 8.4 4700 battery I get 3 shot burst Real-sword motors have an INSANE amount of torque. __________________ Custom Builds: FA3674U Krinkov G3SD6

May 23rd, 2009, 02:03	#10
ThunderCactus Not Eye Safe, Pretty Boy Maximus on the field take his picture! Trader rating Join Date: Feb 2007	It's totally normal, I call it cycle overlap Your gears maintain momentum and can pull the piston back by themselves, this is especially apparent with larger batteries or heavy prometheus gears. Infact if you get a powerful enough battery, or charge your battery right to its limit, you can get 4 shot burst on semi! My own M4 gets about 1.3 cycles on a semi shot The only time I found this to be a nuisance is on the trigger master, it takes that 1.3 cycles on semi and puts that exact current through the motor for semi, but on 3 shot burst it'll put around 3 times that power through so you'll often start out with a 4 or 5 shot burst. Not like it's a big deal you just reduce the burst length And since we're on the subject, theres also burst overlap, in which each burst is more than 3 cycles (like 3.2), so every 5th burst you'd get a 4 shot burst. Again, also solved by reducing burst length.

May 23rd, 2009, 20:15	#15
ThunderCactus Not Eye Safe, Pretty Boy Maximus on the field take his picture! Trader rating Join Date: Feb 2007	actually I think Riley got his battery made out of the very first shipment of 5000mah batteries to arrive at prairie battery these are BRAND NEW cells, just got on the market lol

half compressed piston after shooting semi-auto, is that normal?

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