I need help finding an internal diameter using PC-DMIS 4.1

I need to find an internal diameter at the top of a radius (intersection of a cone and radius). When I measure the cone and the radius in 8 places around the origin (8 partial circles), I am unable to construct a circle using the intersecting points of all 8 circles to the cone. I can, however, create pierce points for each circle and a line measured along the wall of the cone, but still can not create a circle out of these constructed pierce points.

We used pin gauges initially to gather this data, but our customer does not care for this technique and has requested we use our CMM to measure. I have attached a copy of the program that I am trying to use. If anyone has any ideas how I can measure this internal diameter at the point that the radius intersects the cone using PC-DMIS, I would appreciate it.

Thanks!

Brian

I need to find an internal diameter at the top of a radius (intersection of a cone and radius). When I measure the cone and the radius in 8 places around the origin (8 partial circles), I am unable to construct a circle using the intersecting points of all 8 circles to the cone. I can, however, create pierce points for each circle and a line measured along the wall of the cone, but still can not create a circle out of these constructed pierce points.

We used pin gauges initially to gather this data, but our customer does not care for this technique and has requested we use our CMM to measure. I have attached a copy of the program that I am trying to use. If anyone has any ideas how I can measure this internal diameter at the point that the radius intersects the cone using PC-DMIS, I would appreciate it.

Thanks!

Brian

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