pic: 4speed1

[asid61]

WOW this looks pretty hardcore. It looks like the depth was kept down so you're not realy using space.
What was the motivation behind using 5.8 pitch gears over "normal" 20p, 16p, or 12p gears?

[Redo91]

Originally Posted by asid61

What was the motivation behind using 5.8 pitch gears over "normal" 20p, 16p, or 12p gears?

anomalynerd stated why they make them the way they do.

Originally Posted by anomalynerd

The gears have to have a 5.8 diametral pitch because we machine them on our cnc mills in shop. The drive system ends up with either 5:1, 10:1, 20:1, or 40:1 gear reduction.

Emphasis mine.

That said, why not purchase a cutter that will cut the tooth profile of something with a larger DP? You seem to have a machine capable of using one.

[DampRobot]

Originally Posted by Redo91

That said, why not purchase a cutter that will cut the tooth profile of something with a larger DP? You seem to have a machine capable of using one.

Might not have an indexing head, or have more of a router setup than a mill setup.

[Rob Greene]

Originally Posted by Redo91

anomalynerd stated why they make them the way they do.

Emphasis mine.

That said, why not purchase a cutter that will cut the tooth profile of something with a larger DP? You seem to have a machine capable of using one.

Our team does overbuild many parts. We used the Lewis gear formula and found that 5.8dp would work well with a high factor of safety. We did break multiple 20dp vex gears in this drive system. The gears are very big and we are looking to reduce to a 6.5dp on the next system we build. The other very important factor for these gears is 100% based on the tooling we have at the time of build.