Regular Vs. Helical Gears

[Styrak]

What's the deal? What are the differences? I know the teeth are different, but what else?
And I assume stores advertising "Flat" gearsets are regular gears?

[AnakChan]

http://pageproducer.arczip.com/daedalus03/workshop.html -> Airsoft Gears

[damage]

Flat - noisy
Helical - quiet if shimmed right

[Styrak]

Thanks guys.

[ThunderCactus]

helical is also MUCH stronger than flat gears due to there being more than one tooth in contact at any one time

[SG1-EVERETT]

I have helical gears, I find them easy to shim due the gears meshing together.
They are also pretty quiet compared to stock gears.
As already mention they are also very strong

[DarkAngel]

Helicals > Flat
for the simple reason of the helical design. more than 1 tooth is touching at one time, and the gears mesh better, reducing wear and noise. Also logically, the gears can handle more torque though ive never tested this theory past 380.

[ThunderCactus]

the prometheus unlimited torque up set is good to 700fps +

[Jimski]

the basic torque up set is apparently very strong too.

helical also reduce a little bit the mechbox speed/ROF because of the perfect grip.

[Voodoo]

extra 1.5x tooth contact and MUCH quieter. Strait(spur) gears are what make that noise when your car is moving in reverse.

[AnakChan]

I've noticed ppl mentioned that it's stronger. That my be true theoretically (more surface area in contact), however construction-wise they are quite thin.

I find with either bad shimming, or pushing your gears too fast, or too strong a spring, they crash easier (the teeth end up folding flat). Not had that problem with flat.

[Voodoo]

how fast and how large of a spring? a buddy has em in his G36 but i dont know his spring.

[MadMax]

Good shimming of helical gear sets is more difficult than spur gears (regular style) because the angled teeth result in a sideload when the gear teeth bear on each other. The sideload is a push in the axial direction (in a direction parallel to the axles). Spur gears only load their axles radially, but helicals impose loads in the radial and axial direction.

The axial load can cause gears to pull towards each other so their faces rub. Face scrubbing between gears will significantly increase rotating resistance and will also promote tooth wear because of the higher torques involved. You can tell if your gears are making face contact if you see wear on their flat sides. Sometimes wear marks appear like a spirograph pattern as you can see the tooth wear marks scratched in by the opposing gear.

Gearboxes must be shimmed such that a small clearance is assured between gear faces.

[Mantelope]

Hm... herringbone gears? That'd be sweet.

[ThunderCactus]

Originally Posted by AnakChan

I've noticed ppl mentioned that it's stronger. That my be true theoretically (more surface area in contact), however construction-wise they are quite thin.

I find with either bad shimming, or pushing your gears too fast, or too strong a spring, they crash easier (the teeth end up folding flat). Not had that problem with flat.

then you either have crappy helical gears or your installing them wrong, because they're industry proven to be stronger. The main drive gear on any heavily armored vehicle is a herring-bone gear (double helical), NOT a flat gear.