I got one of those Chinese knock-offs of the Baldor carbide tool grinder and before I started using it, I decided to do something about the very visible runout in the backing plates. (0.045" TIR in one and after that, I didn't bother to measure the other.) So I took it apart and discovered that the backing plates have nice keyways, though they're an odd size, about 6.2 mm wide (but under
0.25", though it'd be easy to file a key down) and 2.7 mm deep. But the motor shaft didn't have any keyways -- all they'd done was to drill a blind 6 mm holes and push in little stubby spring pins. On one shaft the pin sticks up 1.7 mm, on the other just 0.6 mm.
So how do I get the spring pins out? There's not enough to grab, and the only idea I've had so far is to grind away at them on the inside with a carbide bit in a Dremel, and that'll be slow going.
Once they're out, I've got a long 3/16" milling bit, so I expect I'll bolt the motor down on my mill/drill, lock the shaft with a clamp, and cut proper keyways.
Anyone have ideas about removing the @#$% pins?
BTW, I turned down the backing plates on a mandrel. Back on the grinder, the worse of the two has