Gear Set Question

[Darth Chuckie]

When the description of a set of gears state 200%, 300% or any other percentage-what exactly does that mean? If building a DMR would you use one of these sets of gears? I want to thank all that answer this for me.

[MCG]

The % is the strength of the gears. Obviously, the higher the %, the higher the strength.

For reference, I bought a 300% set of gears to use in my M14 with an M150 spring.

[SteevoLS]

It is not the strength at all. Gear "strength" is determined by the material, machining methods, and how they are post-processed.

When a manufacturer says 200%, they are talking about how many revolutions the bevel gear makes to turn the sector gear. DO NOT assume that the 200% represents the same ratio in every manufacturer. 200% is only relevant when compared to gears from the same manufacturer.

Lower ratio = higher RoF. Higher ratio = lower RoF, more torque. It works exactly like the gears on a mountain bike.

[MCG]

Excuse my stupidity, my liege... 

The basic research I did when ordering upgrades for my M14... led me to believe that the higher percentage equalled higher strength.

[Darth Chuckie]

Thanks guys, that helps me. So does the 300% have more pull for say a M140 and up spring?

[Darth Chuckie]

Has anyone tried either Modify gears or SRC gears? If so, what are your opinions on them?

[Dominum]

Stephen is absolutely correct, however, for those of you that want the details of how this works and why, here's the logic behind it:

Think of the different gear ratios as different "gears" on a bike. Some provide more torque and less speed, or vice versa because some require more pedaling for the wheel to turn once, while some require less pedaling for the wheel to turn once. When biking on level ground (equateable to a light spring) you put it in high gear because there is less resistance, and thus the same amount of force makes you go faster. When going up hill (equatable to a heavy spring) you put it in a lower gear, and though you go slower, each individual turn of the pedals requires less force to make the tire rotate and thus you are able to get up the hill without getting tired (equatable to a motor not being able to pull a spring, or drawing to much amperage that a battery may not have the wiring, etc., cannot handle). The same concept applies to an AEG, except that in order to change "gears" up or down, you literally have to change the gears. In an AEG, the pinion gear on the motor turns the bevel gear, which turns the spur gear, which turns the sector gear. Every time that sector gear makes one complete 360 degree rotation, it pulls back and releases the piston and tappet plate, causing the gun to fire once. The question is then, how many times does the pinion or bevel gear have to rotate 360 degrees in order to cause one 360 degree revolution of the sector gear, and thus one round fire? The answer lies in what ratio the gearset is, and is caused by the spacing of the teeth in the gears. The industry standard for AEG gearsets with most manufacturers is right at about 1:6.3. This means that it take exactly 6.3 turns of the bevel gear to get on rotation of the sector gear (which of course means one round fired). Gear ratios are given in percentages of the standard stock ratio, or in actual form i.e.: 1:6.3. The first number will always be one, and refers of course to the sector gear. The second number varies of course, and is in reference to thebevel gear. The higher the second number, the more torque it produces. The lower the second number, the less toque, and more speed it produces (translates to higher ROF). If you are installing more than an M120, you need a high torque gearset, with full toothed helical being the obvious preference.

There goes another 15 minutes of typing that will never be read, lol.

[SteevoLS]

Remember what you said about overly verbose expounding of odd subjects?

Yeah.

[Dominum]

No one can ever say I don't take the time to help people with their questions .

The ECotAOSC is here to serve .

[Vesper]

I got a question.

Why helical gears?

[SteevoLS]

In a nutshell, they are strong and quiet.

The helical design allows for more surface contact between the gears. This in turn means less force applied to any one tooth. If shimmed properly, they are also very quiet compared to non-helical gears.

What I want to see are herringbone gears for AEGs.

[Isotope]

I definitely agree with you SteevoLS for the herringbone gears.  It wouldn't be difficult for them to actually machine two helical gears and actually bolt them together, eliminating the uneven wear pattern caused by the axial thrust generated by the single helical gears.

It has been my experience that helical gears are the way to go in airsoft, especially with higher strength springs.  More gear surface are in contact, less stress on each individual tooth, longer life.

Out.