Jim, you would not believe how long i tried to explain it to man who is interested in my cnc. I know it is the easiest way and i use it, but he saw similar system somewhere and just requires that.
I have sold few machines before and i have a lot of experiences with guys who necessary need 0,0001 accuracy of cnc, but then use material with +/- 0.5mm tolerance.
This man should be same so i have to make something more sophisticated.
Regards Aluman