Publisher's Synopsis
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ... of drill for a sharp "V" thread j-in. tap, 20 threads per inch. 9. Calculate the depth, radius of curvature and root diameter for a Whitworth thread 5 in. outside diameter, 9 threads per inch. 10. Find the flat on top, flat on bottom and space at the top of an Acme 29 thread, in. pitch. 11. In Prob. 10 find the thickness of the thread at its root. 12. If the double-depth of a sharp "V" thread is.2474 in., what is its pitch? 13. The pitch of a Brown and Sharpe 29 worm thread is 1J in. Find the flat on top, flat on bottom, and depth of the thread. 14. In Prob. 13 find the thickness of the thread at its root. 15. The depth of a Brown and Sharpe 29 worm thread is 1.2015 in. Find the pitch of the thread. 16. Find the root diameter of an Acme 29 thread, 4 threads per inch, when the outside diameter is in. 17. What size drill should be used for a United States Standard lxV-in. tap, 6-pitch? 18. What is the lead of a triple 8-pitch thread? 19. How many turns must be made with a triple 8-pitch thread screw in order to have it advance a distance of 1 inch? 20. Copy from some machinist's hand-book or catalogue a list of U. S. Std. tap sizes and numbers of threads, from in. up to 1 in. by 16ths. CHAPTER XI THREAD CUTTING 83. Thread Cutting. Thread cutting on a lathe is accomplished by moving the lathe carriage at a definite rate along the axis of the screw, while the tool is cutting. For coarse threads the carriage must move rapidly, and for fine threads slowly along the work. The rate of motion of the lathe carriage is controlled by the rate of turning of the lead screw, which is in turn regulated by placing gears of different sizes on the end of the lathe, to transmit the motion of the main spindle to the lead screw. These...