These are listed as hardened, but they are not. Not bad pinions, nothing compared to rcm pinions though.

Okay here goes a KB45 grind on my brand new 1717 motor................

If we were to harden them at home (heat until cherry red then quench in used oil) would they be any better or would that make them worse? I ran an RC-M pinion for about 8 months before changing it out and there's a slight bit of wear on it (just from tons of use), I need something that's going to last as well as or close to an RC-M pinion.

Mike: Any chances of getting us some 6mm bore Mod 1 pinions?

Yes, we tried that. Kevlar actually worked better in our testing, up to about a limit of 30K gs. We've also tried stainless steel sleeving, and titanium sleeving -- they worked well but increased eddy current losses to the point where it wasn't worth using the sleeving.

You really don't want to go above about 45KRPM anyway, hysteresis losses become really big really fast at those commutation frequencies.

9-11 tooth are most likely to small for us and this kv and stay below 30k Gs.

The 11T would be perfect for my application (would put me at 40-45 MPH) but may not fit because of the width of the motor.

What kind of wattage are these motors rated to?

dry ice on the motor shaft and a torch on the pinion!:yipi:

was that just supposed to be funny? or are you saying, "no way am I grinding my new motor" ?

because in the time used to make that video if you had actually touched the dremel to the shaft you would now have a 5mm shaft. And nothing would have been harmed.

it's a fricken steel rod you guys aren't going to hurt it.

So as it looks atm, 6 mm shaft? And how do you guys think it will fit Muggy w/RCM motor mount?

it wont without modification,the rcm muggy mount is ment for 3mm screws and this motor uses 4mm screws

Para:yeah that was lame but really that's all I ended up doing but it took me about two hours. I just didn't want to fubar it up. The flat spot was stripping The sand off the sand paper strips, my files just smoothed over and buffed the shaft, So I whipped out the Dr with the cutoff wheel for most of it.

I think a flat piece of grinding stone would have been the ticket, and some way to hold it parallel to the motor shaft. Maybe have a pivot so that you could "feed" it towards the motor shaft as the shaft is spinning.

ok, so just make the hole slots in the mount 1mm larger then?

A custom front motor cover would be a better idea - it would be easy enough to make the front cover attach via the m4 motor holes and leave a pair of m3 tapped holes to attach to the motor mount.

Have you thought about offering the RCM Pinion Gears with a 6mm bore?

Looks like the demand for these will be on the increase. :yes: