Wed Jun 08 10:45:02 CST 2022
Last artile we talked the most common thread forms, today will talked the thread basic concepts.
Some basic concepts needed to understand when discussing threading.
1. Root/bottom - The bottom surface joining the two adjacent flanks of the thread
2. Flank/side - The side of a thread surface connecting the crest and the root
3. Crest/top - The top surface joining the two sides, or flanks.
Pitch (P) = The distance from a point on the screw thread to a corresponding point on the next thread measured parallel to the axis. Angle (β) = The angle included between the sides of the thread measured in an axial plane..
Major Dia.(D/d) = Bottom of internal thread / Top of external thread
Minor Dia.(D1/d1) = Top of internal thread / Bottom of external threadPitch Dia. (D2/d2) = Important to check with thread micrometer
This is the effective diameter of the screw thread; approximately half way between the major and minor diameters.