Originally Posted by
Roelof
And when you use 2 same materials for the gears the friction is high. That is because 2 equal surfaces on microscopic level do grab into each other giving a much higher resistance than using gears of different materials. With that knowledge you should understand the wear of the gears of a same material is much higher.
To do a rough prediction I would expect the difference of a full touch and half touch with one plastic pinion much smaller.
If you want to do it right you want DLC coated pinions.
There is no such thing as "doing it right." No matter how I do it, someone else will have a different opinion on what it right. For example, this last video. Its obvious some are missing the point.
My point is, same gears, positioned differently, will produce a noticeable different outcome.