Not really sure where to exactly i should've posted this but its here now. I am recently new to CMM so im still learning alot. That being said I have a slight issue with something im trying to do with my CMM I am trying to do an adaptive circle scan on the OD of a circle Ive gotten it adjusted correctly to the right diameter and depth to check it. When I start the program it makes contact with the part but then starts going away from the part. I think I need like a barrier. Similar to a clearance plane but reverse. Im sure its in PCDMIS and im just not seeing it. Any and all help is appreciated.
the spacer needs to be a high enough number to ensure that the sample hit will hit on the surface surrounding the feature, and if you expect the feature to vary, then you need a higher number. I start at 3mm, and if I expect the feature to vary more than 2mm, I increase the spacer. For a circle (slot) with 3 sample hits, if you use 2mm spacer, and it is 2.5mm off location, your probe will be sliding into the hole to measure the surface, those sample hits make a plane the Pcdmis will then measure the circle in (like a workplane for a 2D feature). If one of them is skewed , ALL results are bad.
the spacer needs to be a high enough number to ensure that the sample hit will hit on the surface surrounding the feature, and if you expect the feature to vary, then you need a higher number. I start at 3mm, and if I expect the feature to vary more than 2mm, I increase the spacer. For a circle (slot) with 3 sample hits, if you use 2mm spacer, and it is 2.5mm off location, your probe will be sliding into the hole to measure the surface, those sample hits make a plane the Pcdmis will then measure the circle in (like a workplane for a 2D feature). If one of them is skewed , ALL results are bad.
