How would one calculate pitch diameter for external threads on a CMM and verify that the results are correct. I need to check some pretty large acme threads im not too sure about the nominal dimensions.
Why not a shank probe? I thought it what they were made for.
Your shank probe and thread would need to be perfectly square to each other and the shank probe would need to be perfectly square to the CMM - that's impossible! Think about how an unsquare shank prob will contact the thread - like this /|/ - thread is indicated as the mid line - not good for finding a decent C/L.
Why not a shank probe? I thought it what they were made for.
Your shank probe and thread would need to be perfectly square to each other and the shank probe would need to be perfectly square to the CMM - that's impossible! Think about how an unsquare shank prob will contact the thread - like this /|/ - thread is indicated as the mid line - not good for finding a decent C/L.
