gearbox sound

Discuss battery powered AEGs (Automatic Electric Guns) in this forum.

Postby pseudoanimosity » Tue Mar 08, 2011 10:20 pm

Nox wrote:
Minerva wrote:If you were to pull the trigger while the gears were unwinding, you would rake the teeth on the piston and strip it


THIS.
If the piston and gearset is moving and you pull that trigger while all that pressure is moving forward, it could put ALOT of strain on the gears - and if they aren't steel then the torque or pressure could start snapping teeth.


having the piston moving forward puts the same amount of stress on the gears/motor/piston regardless of whether or not it is moving forward or not, due to the fact that as the piston moves forward, the energy stored in the spring is converted to kinetic energy, but the total energy does not change, making the force the same.

Eb=Ea Energy before = energy after, it's just in a different form.
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Postby Minerva » Tue Mar 08, 2011 10:45 pm

We mean that if the piston is cycling forward and you have the energy of the forward moving piston combined with the rear moving sector gear which would cause the piston teeth to be raked and stripped. In your line of logic it would be an equation with vectors. A piston moving with say 3-4 newtons of energy at a vector to the right would be combined with a say 3-4 newton movement of the sector gear to the left, meaning the piston teeth would incur 6-8 newtons of stress instead of its usual 3-4, thus causing the teeth to strip. This is all theoretical napkin math of course :p I'm sure there is some physical flaw in my equation but the point is made.
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Postby Blizzard » Tue Mar 08, 2011 11:02 pm

What about the highspeed setups and short-stroked pistons running 30+? There is virtually not rest period between cycles there, so it's virtually the same thing as what your referring to concept wise.
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Postby Minerva » Tue Mar 08, 2011 11:09 pm

No. As stated earlier (and a common misconception) electrical input has no effect on the compression of springs or stress on the gearbox. The reason they short stroke them is to prevent that pre-mature engagement, otherwise the gearbox would eat pistons for breakfast :D

What i mean in that concept is this: Instead of the "piston killing 6-8 newtons" you would repetitively receive "3-4 newtons" of force on the teeth. While you would accelerate the eventual wearing of your piston you have to remember a key point; if your going to run a racecar, be prepared to change the tires. Keep in mind those figures aren't accurate and are just there to prove a concept.
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Postby Jester316 » Wed Mar 09, 2011 1:05 am

I disagree that pulling the trigger while the spring is unwinding would strip it. Stripping occurs when you have 1 immovable force being acted on by a moving force. IE: your piston locks up for some reason (come out of the track, piston/piston head fracture, whatever...) and you try to force cycle the box. The teeth will break at the weakest point when the power of the motor is converted to mechanical energy.

If you have the piston returning to home from a partially compressed spring (not fully compressed, that would result in a firing stroke, not a return stroke) and you apply the force from the motor, you are just redirecting the force of the spring from a forward momentum to a rearward momentum. If you strip teeth in this process, your spring is to powerful for the motor to pull (and thus would end up stripping teeth anyways).
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Postby God » Wed Mar 09, 2011 8:00 am

Well, as extra input... The gears are G&P reinforced steel supposedly. And I don't think the ARL physically broke per-say, I think the spring on it was put in wrong. Because when I shake the gun, I hear no clanging of metal. Or the spring is just not strong enough to hold back the gears-
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Postby Minerva » Wed Mar 09, 2011 5:26 pm

MalikMazadu wrote:Well, as extra input... The gears are G&P reinforced steel supposedly. And I don't think the ARL physically broke per-say, I think the spring on it was put in wrong. Because when I shake the gun, I hear no clanging of metal. Or the spring is just not strong enough to hold back the gears-


Then no your not in any trouble.

Jester, the two forces are acting against each other and would in fact cause the piston teeth to strip. If you do not concur, I implore you to test that theory.
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Postby God » Wed Mar 09, 2011 5:59 pm

Added weirdness, recently, as of 10min ago, I was doing a poor man's chrono test and the trigger jammed for a second. Now it unjammed fine, I switched it to full auto. Then I switch it back to semi and every other trigger pull on semi is automatic. I have never heard of this issue...
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Postby Minerva » Wed Mar 09, 2011 8:01 pm

Eh that happens to my M4 from time to time. Usually switching from semi to auto and back fixes it for me
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Postby God » Wed Mar 09, 2011 8:04 pm

Eh, it isn't that easy I don't think... And now the trigger is locked like it would be on safe... Only it's on semi.
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Postby Blizzard » Wed Mar 09, 2011 8:31 pm

Minerva wrote:If you do not concur, I implore you to test that theory.


Have you tested your theory? I see where your coming from, but I think you might be over-exaggerating the effects of the concept.

Either way, I'm glad to see you've put a lot of thought into your argument. ;)
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Postby Switchback » Wed Mar 09, 2011 9:35 pm

MalikMazadu wrote:Eh, it isn't that easy I don't think... And now the trigger is locked like it would be on safe... Only it's on semi.


You might have a dead or dying battery. Recharge and retry.
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Postby pseudoanimosity » Wed Mar 09, 2011 9:40 pm

Switchback wrote:
MalikMazadu wrote:Eh, it isn't that easy I don't think... And now the trigger is locked like it would be on safe... Only it's on semi.


You might have a dead or dying battery. Recharge and retry.


No, it means part of his gearbox is a little jacked. Mine does that from time to time as well, but I just switch to auto and own some bitches =P
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Postby Switchback » Wed Mar 09, 2011 9:41 pm

pseudoanimosity wrote:
Switchback wrote:
MalikMazadu wrote:Eh, it isn't that easy I don't think... And now the trigger is locked like it would be on safe... Only it's on semi.


You might have a dead or dying battery. Recharge and retry.


No, it means part of his gearbox is a little jacked. Mine does that from time to time as well, but I just switch to auto and own some bitches =P


Okay.
I know for a fact that that also tends to happen when the GB is out of sync due to a low battery charge.

Could be that little spring floating around, on its own program.
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Postby pseudoanimosity » Wed Mar 09, 2011 9:42 pm

Switchback wrote:
pseudoanimosity wrote:
Switchback wrote:
MalikMazadu wrote:Eh, it isn't that easy I don't think... And now the trigger is locked like it would be on safe... Only it's on semi.


You might have a dead or dying battery. Recharge and retry.


No, it means part of his gearbox is a little jacked. Mine does that from time to time as well, but I just switch to auto and own some bitches =P


Okay.
I know for a fact that that also tends to happen when the GB is out of sync due to a low battery charge.

Could be that little spring floating around, on its own program.


a gearbox will never go in/out of sync due to a low charge. It may not cycle all the way through, but the order in which parts move will always be the exact same.
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