AS shown in the attachment where would the X and Y origin be derived from along the cylinder
, at the middle (orange circle), where the cylinder starts at the face (blue circle) or at the projection/pierce point of [A] (red circle)?
Assuming datum B's axis is pointing along Z, then X and Y will be same at any point along that axis - so it doesn't matter. PC-DMIS will calculate the cylinder's axis direction from all of the hits and fit a cylinder to them. If you level ZPLUS to that cylinder and origin X & Y, any point along the axis will be X=0, Y=0. The THEO and ACTL co-ordinates displayed for the cylinder in PC-DMIS will vary depending on how you've measured it.
Measured cylinders - X,Y,Z are an average of all the hits so it will be the centroid.
Auto-Features - X,Y,Z are at the start point of the cylinder, which is dependent on which end of the cylinder you click when selecting from the CAD model.
Assuming datum B's axis is pointing along Z, then X and Y will be same at any point along that axis - so it doesn't matter. PC-DMIS will calculate the cylinder's axis direction from all of the hits and fit a cylinder to them. If you level ZPLUS to that cylinder and origin X & Y, any point along the axis will be X=0, Y=0. The THEO and ACTL co-ordinates displayed for the cylinder in PC-DMIS will vary depending on how you've measured it.
Measured cylinders - X,Y,Z are an average of all the hits so it will be the centroid.
Auto-Features - X,Y,Z are at the start point of the cylinder, which is dependent on which end of the cylinder you click when selecting from the CAD model.
