R.O.F.
 

Can someone please explain to me what mechanism is responible for controlling whether the gun fires in semi-auto or full auto; Is this electricl in nature? I have an Armalite M15A4 and i can't figure it out other than b just looking at the mech box. Thanx.

Selector plate?

What does that have to do with ROF?

yeah the two aren't really the same... Rate of fire is more dependant on how powerful a motor/battery you have. The selector switch is different...

Wouldn't springs and gears also be a major contributing factor too? :P

But yeah, selector plates don't control rof.

Sorry folks, I'm not to familiar with the proper terminology. So this function between semi-auto and full auto is controlled by the selector plate? Is this selector plate located inside the mech box?

http://www.airsoftparts.ca/store2/im...-set-m16a2.jpg

See that black plastic thingy with the two copper contacts? That's your selector switch. By the way, if you need any help with your mechbox, I might be able to help you. Though I live in the West Island, haha.

So, here's the dumb question I suppose: How does that selector plate establish whether it's in semi-auto mode or full auto mode; Does it have to do with how the copper contacts come together? Thanx Again.

It's exactly that.

Well, when I look at the copper contacts and slide the selector plate, they both touch at the same time; So how is either function engaged (or are my contacts not properly aligned)?

Not so much. That puts it on safe. Inside the mechbox there is something called a cutoff lever that stops the gears after one revolution on semi. The cutoff lever is affected by the selector plate.

Haha, it's funny that I JUST sent him an email about that after I realized I got my facts wrong, silly me. :P

Thanks for correcting me.

So, ultimately, it's perfectly normal for the copper contacts to touch simultaneously - the actual determination for single shot or auto is detrmined by another mechanism internally which is connected to the selector plate (is this accurate because if it's not then my copper contacts are not in proper order). Thanx.

Selector plate in contact with both contacts on the mechbox = gun fires
Selector plate only partially back, tripping cut off lever = semi auto
Selector plate all the way back and cut off lever disengaged = full auto
Selector plate not in contact with both mechbox contacts = broken circuit, no power gets to motor

Then, in mode either mode (semi or full auto) both copper contacts will be touching - Is this correct?

Yup, if one contact is not touching then the gun shouldn't fire at all as the circuit is not complete.

Okay, Very Good :) I take it then that the cut off lever is siutated inside the gearbox?

Yup. Makes contact with the sector gear (gear that contacts the piston).

lol was this cleaned?

edit: wait, i was thinking of the other thread lawl

Yes, it was cleaned and I did notice a small hook like protrusion which I assumed interfaced with the sector gear but, as I had outlined earlier, I am not familiar with neither the proper terminology nor the actual components; Was a safe bet on my behalf to rebuild the gearbox according the the V2 video on mechbox.com even though it was not specific to an Armalite unit?

no i meant the thread itself haha

so, was it a good idea to use the mchbox.com V2 video for rebuilding my Armalite gearbox?

V2 boxes fit in a lot of guns, the things that differentiate between models would be stuff like the porting on cylinders, nozzles, selector plates; stuff like that. Aside from that, if you know how to reassemble one V2, you know how to assemble them all.

Also, Skladfin was talking about the thread I caused a bit of a ruckus in, heh heh... As I mentioned before, if you have any questions or need help with your mechbox, I can help you out in person.

Yes. An armalite mechbox is V2. And there's not much differences to different versions anyway.

(i send you a message gigaknight)

The most difficult part for me was aligning the sector gear to that "critical" 1:00 o'clock position; Just how perfect does that actually have to be?

not that perfect...

Okay, that actually makes me feel better since this was my first time putting that gearbox back together :)

I suppose that my last question would have to be how important is the shimming to overall functionality / performance/

Shimming is INCREDIBLY important; the gears have to mesh perfectly as to ensure they perform at their peak and I think there's something about misaligned teeth causing stress or something; I don't know I use modular gears so I don't have to worry about shimming. :D

I'm so fucking lazy!

I suppose then someone here needs to kindly explain how to determine / verify whether the shimming was properly performed; Is there a special or particular technique? Thanx.