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Cylinder Min Value compared to Max Inscribed

mgroll77
I was asked if the measured max inscribed value of a circle/cylinder should be the same as the minimum value measured for that same circle/cylinder.

As far as I understand it, a max inscribed value of a hole is based off of the 3 inner most points to a circular axis. It's the largest virtual or actual pin that will fit in the ID. The minimum value is the point closest to the circular axis, (radius*2). Sometimes max inscribed and min value are the same, sometimes not.

What am I missing.
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  • Maximum Inscribed – This calculation type generates an empty circle with the largest possible diameter that lies within the data. PC-DMIS first computes a Minimum Circumscribed circle and requires that the center of the Maximum Inscribed circle lies within it. This option could be used for a circular feature that requires a mating stud. For example, if the input data represents a hole, then this calculation returns a circle with the diameter of the largest stud that will fit inside the hole.

    This is right out of the pcdmis help file. It also has a explanation for the other 4 types of circle measurments. If your measuring with 24 hits as I understood in posts above. Try a odd number of hits this may give you some different results hth
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  • Maximum Inscribed – This calculation type generates an empty circle with the largest possible diameter that lies within the data. PC-DMIS first computes a Minimum Circumscribed circle and requires that the center of the Maximum Inscribed circle lies within it. This option could be used for a circular feature that requires a mating stud. For example, if the input data represents a hole, then this calculation returns a circle with the diameter of the largest stud that will fit inside the hole.

    This is right out of the pcdmis help file. It also has a explanation for the other 4 types of circle measurments. If your measuring with 24 hits as I understood in posts above. Try a odd number of hits this may give you some different results hth
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