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ELI5: Why does adding Pitch when checking threads matter?

1. Like the title says, why does adding pitch when checking threads matter?
2. Does it?
3. If you are checking a thread as a cylinder, how does adding the pitch affect the measurements?
4. If you are checking the "cylinder" using least squares, and it's averaging out the points anyways, does adding pitch calculate position more accurately?

(i might have asked the same question a few different ways!)

Parents
  • if I have a pitch of 13, (~.077), and I check it using a cylinder measuring it at 3 locations, then those locations need to be relative to the pitch as well correct? So I would need a length of ~.233 and lets say I want to be a few threads below the surface so I should check it at a depth of ~.154?

    All those factors matter correct?
Reply
  • if I have a pitch of 13, (~.077), and I check it using a cylinder measuring it at 3 locations, then those locations need to be relative to the pitch as well correct? So I would need a length of ~.233 and lets say I want to be a few threads below the surface so I should check it at a depth of ~.154?

    All those factors matter correct?
Children