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Old September 29th, 2009, 11:43   #4
m102404
Tys
 
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Join Date: Apr 2006
Location: Toronto
Imagine the following. You've got a battery with a +ve (red) and -ve (black) connections on it. You run a black wired from the battery (-ve contact) straight to the -ve terminal of the electric motor.

If you ran a wire straight from the +ve (red) terminal of the battery and touched the wire to the +ve terminal of the motor...the motor would spin, because you've completed the circuit.

All the switch assembly does is put an On/Off switch in the middle of that red wire. Basically there are two metal contacts...and the trigger pushes a metal block inbetween them to complete the circuit. Imagine a mechanical throw switch (like the old movies where the warden throws a big switch to fry a guy on an electric chair....same sort of thing, a mechanical contact switch).

The plastic housing just holds the 2 metal contacts, metal block, return spring and connecting wires in place.

When the circuit is completed...the motor spins...turns the gears...pulls back the piston...and the shot is fired.

**edit**
Some switch assemblies have metal contacts on their side (usually the left side)...and the circuit is completed by a metal tab on the selector plate. This is a bit redundant since completing the circuit there does not cause the motor to spin...and the safety is a mechanical block that prevents the trigger from moving. But I suppose it is a redundant safety...so whatever that's worth.
*****

How the mechbox is put into semi-auto vs. full-auto is an entirely different thing....but essentially a little arm flicks the metal block out of contact after each shot.

Hope that helps,

Tys

Last edited by m102404; September 29th, 2009 at 11:47..
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