Patch Scan and Reverse Engineering

[Bulldog40]

Has anyone here used patch scanning with prob comp off? I was wondering if reverse engineering a die detail with different angles and transitions from a form die with probe comp off would creat a CAD model. Then this could be tool compensated in the mill by half the diameter of the probe.
Any thoughts on this???

[TRD_racing]

I did mine a little different. I took a ball the dia. of the cutter our CNC guy wanted to use. We created a probe w/ that and did our scans. This way he had ball center and could use it to program his cutter path from and didn't have to offset it.

[Matthew D. Hoedeman]

I always turn off the probve comp when doing 3-D scans with the CMM (TP2). I have noticed that you get little 'tails' at the end of patch scans when using a TP2 with the comp on. My cad guys have NO PROBLEMS at all with un-comped data. ALSO, if you are using ANY touch trigger probe, you have to use SURFACE points for the scan with a minimum of 3 sample hits to get correct probe compensation. So, that means you take 4 hits for each point of data, or you can turn off the comp and take 1 hit for each point of data. The choice is yours.