(11-13-2015, 12:56 AM)f350ca Wrote: Checking the wheel is pretty simple Vinny. Let it hang loosely on a shaft through the hole and gently tap the rim with something like the handle of a screw driver. It will ring a little if its good, if you get a dead thud sound it probably has a crack.
And you still Suck
ditto
Here's a good video on ringing a wheel: https://www.youtube.com/watch?v=NDtL4gisZYo
As to coolant systems. I purposely use a mineral lard oil/diesel fuel mix in my lathe & mill to help keep down the bacteria. On the surface grinder I use soluble oil as the other reduces the effectiveness of the grinding wheel.
One place I worked had a huge central coolant system that was filled with staph. Stand alone systems are much easier to deal with.