My two cents on this interesting thread on threads is: I only check threads as RFS on any CMM routine regardless of print callout and use the pitch option. I typically adjust the depth setting to get the truest circular size of the minor diameter and cross check with gage pins, as you guys have said impossible to check pitch dia and call that out. Fortunately for me my customers are okay with the practice and one even insists on it. And in reality it was this particular customer which convinced me to use this practice on all of my programs.
The biggest problem I have with measuring threads in general is on a turned parts with no definite way to square to the machine from part to part. When I get parts like that I usually try to align the part on the table with the start of the thread in the same direction every time. And with these old eyeballs of mine not always consistent.
My two cents on this interesting thread on threads is: I only check threads as RFS on any CMM routine regardless of print callout and use the pitch option. I typically adjust the depth setting to get the truest circular size of the minor diameter and cross check with gage pins, as you guys have said impossible to check pitch dia and call that out. Fortunately for me my customers are okay with the practice and one even insists on it. And in reality it was this particular customer which convinced me to use this practice on all of my programs.
The biggest problem I have with measuring threads in general is on a turned parts with no definite way to square to the machine from part to part. When I get parts like that I usually try to align the part on the table with the start of the thread in the same direction every time. And with these old eyeballs of mine not always consistent.
