How to calculate gear ratios

[enemybrit]

Hey, just wondering how you calculate gear ratios. I am specifically trying to figure out the stock ratio for m14 gears, since the spur gear in smaller than standard v2/3 gears.

[m102404]

Go to airsoftmechanics.com and look up their article on it...a little bit more about how to calculate your expected rate of fire, but it goes through the gear ratios examples nicely.

[enemybrit]

Originally Posted by m102404

Go to airsoftmechanics.com and look up their article on it...a little bit more about how to calculate your expected rate of fire, but it goes through the gear ratios examples nicely.

Thanks! Will do!

[godwin]

I post this lately here too:


Count the teeth and calculate.

for V2/V3 Gearbox Gears:

TM Stock Gears from AUG: 18,72 : 1

        in   out   single overall
pinion       10*   3      18,72x
bevel   30*  10*   3,9    6,24x
spur    39*  20**  1,6    1,6x
sector  32   16    1      1x <-Start
piston  16

Calculate: sector in/spur out * spur in/bevel out * bevel in/pinion out
Thats 32/20 * 39/10 * 30/10 = 18,72

out = teeth from the gear, which drive the next gear
in = ^^
*...seems to be normal on all gears
**...different on torque and speed gears

Now lets say you have 20 RPS with this setting, the motor spins 18,72 x 20 = 374,4 / second.
You now switch to 16:1 Gears => 374,4 / 16 = 23,40 RPS.
So you theoretically gain 3,40 RPS from your new gears.