Machinery’s Handbook, 31st Edition
2922
Index
H elix
( continued )
H elical gearing
( continued )
lead angle 2200 measurement of angle 2199 H erringbone gearing 2289 failures 2289 H ertzian contact area 2500 H ertz stress 2206 H exagon area 77 diagonals 87
British Standard 2251 calculations 2274 center distance 2274 for enlarged 2286 exact 2277 change gears 2287 checking gear size 2309, 2314
cutter for milling 2283 data on drawings 2242 direction of thrust 2274 enlarged fine-pitch pinions 2283–2286, 2285 feed rate change 2288 fine pitch teeth 2285 formulas 2274, 2276, 2277, 2278, 2279, 2280, 2282, 2285 helical overlap 2206 helix angles 2275, 2280 herringbone type 2289 hobbing 2287, 2289 involute form milling cutter 2284 with differential 2288 without differential 2287 measurements using wires or balls 2314 milling the helical teeth 2284 minimum center distance 2280, 2282 normal tooth thickness 2214 pitch diameter 2274 pitch of cutter 2275 replacement gear dimensions 2330 shafts parallel 2276, 2277 at right angles 2278, 2279 shafts at right angle 2281 specifications 2240 spur gear replacement by helical gears 2328, 2330 thrust 2274 tooth proportions 2214 tooth thickness measurement 2314 lead accuracy 2288 lead of tooth 2274 machine
moment of inertia 243 radius of gyration 243 section modulus 243 H igh-energy-rate metal forming 1439 H ighest point of single tooth contact (HPSTC) 2206, 2236 H igh-speed steels 443–445, 1078 annealing rehardening 495
cobalt 961, 962 cobaltcrom 493 cooling period 501 cutters 901 as cutting tool materials 1078 drawing 495 hardening molybdenum 496 heat treatment 493 annealing 496 cutting efficiency 494 equipment 498
hardening temperatures 494 preheating tungsten 493 quenching
molybdenum 497 tungsten 494, 495 subzero treatment 502 tempering molybdenum 497 time for through hardening 494 molybdenum 443–444, 448, 496–498 hardening 496 quenching and straightening 495 tempering 495 tool 445 tungsten 445, 448, 493, 496 tungsten annealing 496 H igh-strength, low-alloy steels. See HSLA steels H obs change gears for relieving 2185 roller chain sprocket 2634, 2635 tip radius, maximum 2235 worm gear 2270 H ob tip radius, maximum 2235 H oisting chain and wire rope 2711 H olders for NC, insert 841–859 H old-on or dolly bars for riveting 1866 H ole circles adapting equations for geometry 710 coordinates for 708–720
troubleshooting 2289 wire diameter 2309
H elical milling development of helix 2199 helix angle 2200 lead of ahelix 2199 H elical overlap 2206 H elix 2199 angle 2200, 2206, 2275, 2280 angle factor 2253 angles, screw threads 1978–1987 constructing 70 end mills with Weldon shanks 880
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