Good evening,
What is the best way to measure threads on the CMM? I would just use a thread gage and put it in the report but I was asked to write them in the program. Thank you in advance.
When it comes to reporting true position of threads do you leave out the dia of the thread? If you do report the dia what is the tolerance? Do you just use the nominal dia pcdmis comes up with? There are a few different ways that people have programmed threads. Some left the dia out and just reported the position and some reported the dia with a tolerance. I just cant seem to figure out how they came up with a dia and tolerance.
Some insert specs require a modified minor diameter size (for internal threads). The objective of checking internal threads is to primarily obtain location, and a secondary objective is to get an "idea" of the minor diameter. When checking threads I refer to the Machinist Handbook for minor diameter size and tolerance and use that as my nominal and tolerance scheme to get "an idea" of whether or not the thread size is correct. I have caught incorrect thread sizes and minor diameters using this technique.
In other words, I do include diameter size on most threads, and add verbiage if it measures OOT but measures ok with a pin or other double check method.
Some insert specs require a modified minor diameter size (for internal threads). The objective of checking internal threads is to primarily obtain location, and a secondary objective is to get an "idea" of the minor diameter. When checking threads I refer to the Machinist Handbook for minor diameter size and tolerance and use that as my nominal and tolerance scheme to get "an idea" of whether or not the thread size is correct. I have caught incorrect thread sizes and minor diameters using this technique.
In other words, I do include diameter size on most threads, and add verbiage if it measures OOT but measures ok with a pin or other double check method.
