Jeff,
I have only distant dreams of CNC. Someday maybe I will home brew a small mill.
I didnt record any feed rates or cut depths. I just waded into it and felt my way around. I am thinking 20 thou as a heavy cut. I say that because of the crystals you may come across (talked about earlier in this post) If your in a really heavy cut your gonna grab one and bammo,,,project over. The outer shape I just did freehand so to speak,, got it close and started in with sand paper. As I recall the Carbide was no worse for wear when I was done. The stuff cuts easier than it looks like it would. Comparable to wood I would say. I am sure you could saw it of file it or route it. I used HSS on the boring bar, no problems. You want to collect some of the dust right away and save it. If you get a tearout or other damage you can fill it with powder and drip in CA glue for a repair.
Thanks
