Difference between two wire and three wire method mathematically and why
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Explanation:
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Answer:
Explanation:
Important definitions and formulas:
1. ANGLE OF THREAD- This is the angle included between the sides of the thread measured in an axial plane. It is represented by the letter A. The half angle is represented by a small letter a. The angle of thread is known from the name of the thread. All Unified form and National threads have a 60° angle. Acme and some Worm threads have a 29° angle, and Whitworth threads have a 55° angle.
2. PITCH-This is the distance from a point on the screw thread to a corresponding point on the next thread measured parallel to the axis of the thread. It is represented by the letter p. (p=1/n).
a. FED-STD-H28 uses the Greek letter alpha “?” for ½ included angle of Thread (Axial Plain). In Appendix A, we use the English “a”.
3. DEPTH OF THREAD- This is the distance from the crest to the root of the thread measured perpendicular to the axis of the screw or nut. ** It is represented by the letter h.
4. MAJOR DIAMETER- This is the largest diameter of the screw or nut. ** It is represented by the letter D. No formula is needed for the major diameter as it is used to identify the size of the screw. For instance a ¼” – 20 screw is one having a major diameter of 1/4 inch, and 20 thread per inch.
5. PITCH DIAMETER-The basic thread pitch diameter is the diameter where the thread thickness is equal to the space between the threads. If the flats at the top and bottom of the thread are the same, the pitch diameter will coincide with the middle of the sloping side of the thread. ** The pitch diameter is represented by the letter E.
Formula E = D – Depth of thread = D – h
Or E = D – Twice addendum
6. MINOR DIAMETER- This is the smallest diameter of the screw or nut. On the nut it corresponds to the tap drill size. ** It is represented by the letter K.
Formula K = D – 2 X Depth of Thread = D -2h
7. LEAD ANGLE- This is the angle made by the pitch helix, with a plane perpendicular to the axis. ** It is represented by the letter s or .