Petey, what are your options over there for tracking down a CBN wheel? At one point over here, we could get a wheel with a rolled edge for $125, and though I had to think a little bit before buying one, I was losing diameter off of a $50 pink wheel fast enough to know that over time, the CBN wheel will be cheaper.
I'm not sorry I did. CBN transfers heat at a much higher percentage than alumina. The grind heat with alumina is mostly left in the tool, because the alumina wheels don't absorb it. Since CBN transfers heat, a lot of the heat when grinding with CBN ends up in the massive aluminum or steel base wheel. You could still burn something with CBN if you wanted to intentionally, but it would be pretty difficult.
That said, even a coarse grit cheap round wheel is fine if it's kept fresh with a cheap diamond dresser. Total cost for the pair should be about 20 pounds. The fine wheels and the loaded wheels are the ones that burn things.
I'm not sorry I did. CBN transfers heat at a much higher percentage than alumina. The grind heat with alumina is mostly left in the tool, because the alumina wheels don't absorb it. Since CBN transfers heat, a lot of the heat when grinding with CBN ends up in the massive aluminum or steel base wheel. You could still burn something with CBN if you wanted to intentionally, but it would be pretty difficult.
That said, even a coarse grit cheap round wheel is fine if it's kept fresh with a cheap diamond dresser. Total cost for the pair should be about 20 pounds. The fine wheels and the loaded wheels are the ones that burn things.