CG1017
Mechanical
- Nov 21, 2022
- 4
Hey all,
I have a part with some threaded holes....The callout on the drawing is .086-56 UNC 2B minimum .19 deep. I took the measurement from the end of a plug gauge to the other end of the part, and subtracted from the total length of the plug gauge un-inserted to get the depth of the thread, and got .215. Just for comparison, I counted the turns once bottomed out (10.5 turns), and when multiplied by the pitch (1/56), I got .187.
Why the two different readings?
Which is the correct measurement?
Is there a more accurate way of inspecting thread depth that doesnt involve special tools? With respect to threads/taps, I only have access to basic plug gauges, a Micro-Hite, and verniers; we dont have CMMs, comparators, or any other advanced equipment at my job.
Thanks for any advice, this is my first time posting.
I have a part with some threaded holes....The callout on the drawing is .086-56 UNC 2B minimum .19 deep. I took the measurement from the end of a plug gauge to the other end of the part, and subtracted from the total length of the plug gauge un-inserted to get the depth of the thread, and got .215. Just for comparison, I counted the turns once bottomed out (10.5 turns), and when multiplied by the pitch (1/56), I got .187.
Why the two different readings?
Which is the correct measurement?
Is there a more accurate way of inspecting thread depth that doesnt involve special tools? With respect to threads/taps, I only have access to basic plug gauges, a Micro-Hite, and verniers; we dont have CMMs, comparators, or any other advanced equipment at my job.
Thanks for any advice, this is my first time posting.
