Upcoming Castle Outrunner Motors

[sikeston34m]

Originally Posted by Metallover

You know what would be great? I'd like to see an adapter that would let you use a spur gear as your pinion gear. Look at the picture above. Drill out a couple holes in that pinion and then you could screw the spur onto it.

Anyone think this would be a useful item?

There are several problems with that.

#1. Even a 25 tooth gear isn't big around enough. A 30+ tooth would be required for the threaded holes to be into the meat of the gear inwards beyond the teeth.

#2. This is some HARD stuff. The good thing about it is, it is hardened by tempering. This means in its current state, it isn't drillable. The way to overcome this is, heat it up cherry red with a torch.(acetylene torch) Then let it cool slowly in open air. This removes the temper and makes it drillable and tappable. Drill and tap. Then reharden by replacing the temper. To do this, heat it up cherry red again, then drop it into cool motor oil. Quench it, as they call it. This restores the temper and hardness. IF you attempt this, wear eye protection and be wary since there is a violent reaction when you quench it. Spatter, splatter, sizzle.

#3. How would you be sure that your holes were perfectly centered? It has to run true you know?