Still a newbie to CMM and PC DEMON. Is it possible to construct a circle

using 3 points that are less than .001" apart? I'm trying to come up with a way to estimate position between the cylindrical hole inside an externally

threaded cylinder and the pitch of the external thread . The inner diameter is about 1.8" and the external threads are 2.4-16. I'm supporting the part by the threads held by a fixed thread ring gage held in a vice. In one position I am taking 3 hits deep in the cylinder to get a circle then taking 3 hits

shallow in the cylinder to get a second circle. I'm then rotation my part 120

degrees then finding the same circles. The process is then repeated once more after a second 120 degree rotation . I'm trying to construct a circle using the 3 "inner " circles then doing the same with the two "outers" suspecting that the diameters of said circles might describe the position that I'm after. Everything seems great til I try to construct the circles- I'm getting the "MATH FAILED"..." FEATURES DO NOT..." message.

Can any of you youngins help out an old guy? or any of you really old guys

help out a youngin?

Thanks

MJB

using 3 points that are less than .001" apart? I'm trying to come up with a way to estimate position between the cylindrical hole inside an externally

threaded cylinder and the pitch of the external thread . The inner diameter is about 1.8" and the external threads are 2.4-16. I'm supporting the part by the threads held by a fixed thread ring gage held in a vice. In one position I am taking 3 hits deep in the cylinder to get a circle then taking 3 hits

shallow in the cylinder to get a second circle. I'm then rotation my part 120

degrees then finding the same circles. The process is then repeated once more after a second 120 degree rotation . I'm trying to construct a circle using the 3 "inner " circles then doing the same with the two "outers" suspecting that the diameters of said circles might describe the position that I'm after. Everything seems great til I try to construct the circles- I'm getting the "MATH FAILED"..." FEATURES DO NOT..." message.

Can any of you youngins help out an old guy? or any of you really old guys

help out a youngin?

Thanks

MJB

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