Hello everyone, im having some difficulties on the best way to mesure the a distance to the theoretical sharp for dim .131±.004 in the pic below. I'm new to these kind of dim distances so any suggestion is most appriciated thanks.
What tolerance are you working to? There isn't one provided in the image you posted. If the tol. is +\- .1in you could use almost anything to measure it. If the .tol is +\- .001in then things get trickier.
If you must measure on CMM and you have scanning capability you could scan along the 2D cross section as shown in the image with a very small ruby capturing as much of the radius as possible without contacting the cone. Then construct a best fit circle through those points. Now measure a few points on the side of the cone right above the radius and construct a line. Now intersect the circle with the line (if you can do that. Can't remember for sure if that combination is allowed for an intersect point) to get the theoretical sharp intersection. If PCDMIS won't allow that combination for an intersect you could write a script to do it and then pass the value back to a generic point in PCDMIS.
This would be a ton of work (if you have to script it) so would only make sense if you are measuring a large quantity in an environment that requires full automation. In that case you would be better off to invest in a laser scanner or some other such device that can acquire high density point clouds and handle this type of feature more easily.
What tolerance are you working to? There isn't one provided in the image you posted. If the tol. is +\- .1in you could use almost anything to measure it. If the .tol is +\- .001in then things get trickier.
If you must measure on CMM and you have scanning capability you could scan along the 2D cross section as shown in the image with a very small ruby capturing as much of the radius as possible without contacting the cone. Then construct a best fit circle through those points. Now measure a few points on the side of the cone right above the radius and construct a line. Now intersect the circle with the line (if you can do that. Can't remember for sure if that combination is allowed for an intersect point) to get the theoretical sharp intersection. If PCDMIS won't allow that combination for an intersect you could write a script to do it and then pass the value back to a generic point in PCDMIS.
This would be a ton of work (if you have to script it) so would only make sense if you are measuring a large quantity in an environment that requires full automation. In that case you would be better off to invest in a laser scanner or some other such device that can acquire high density point clouds and handle this type of feature more easily.
