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ELI5: Why does adding Pitch when checking threads matter?

BIGWIG7
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!)

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  • 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?
  • in reply to BIGWIG7
    Yes, any pattern of circles should be an integer of the pitch.
    IE circle 1 should be at least 2 threads down to eliminate the lead thread.. so start at 0.077*2 = 0.144 in z
    circle 2 could be about mid-thread (let's say your threads are 1.5" deep), so 13 threads per inch at 1.5" long is 19.5 threads. (round) half of that is 10 threads * 0.077" = 0.770 in z
    circle 3 could be about the same as circle 1 (2 threads prudent of bottom) so 16 threads down? 16 * 0.077 = 1.232" in z
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  • in reply to BIGWIG7
    Yes, any pattern of circles should be an integer of the pitch.
    IE circle 1 should be at least 2 threads down to eliminate the lead thread.. so start at 0.077*2 = 0.144 in z
    circle 2 could be about mid-thread (let's say your threads are 1.5" deep), so 13 threads per inch at 1.5" long is 19.5 threads. (round) half of that is 10 threads * 0.077" = 0.770 in z
    circle 3 could be about the same as circle 1 (2 threads prudent of bottom) so 16 threads down? 16 * 0.077 = 1.232" in z
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