Thomas, Hugh Kerr · New York, McGraw-Hill Book Company, Inc.; [etc., etc.] · leaf 99
<p) <p can be omitted as being too small to make any practicaldifference. Let plane c, d, e, f, be viewed in perspective, asshown in the following figure (&). ^ Draw the perpendicular pq and make the angle pxq 85 86 APPENDIX equal to 30°, that is to say, equal to the pressure angle ^■… … The following table gives the value of xq, the normaltooth pressure for various lead angles. TABLE X Lead angle Tooth pressure. (T = 1 lb.) 15° 4.46 20° 3.375 25° 2.73 30° 2.31 36° 2.01 40° 1.795 45° 1.630 y APPENDIX 87 The other stresses shown in the diagram, Fig. 19, theend thrust of the worm,…
Gearing, Worm
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