Machine design; a manual of practical instruction in designing machinery for specific purposes, including specifications for belts, screws, pins, gears, etc., and many working hints as to operation and care of machines (1918)
Wallace, Ernest L · Chicago, American technical society · leaf 156
bearing. A serious loss of efficiency from frictionis likely to occur here. This is often reduced, however, by roller orball bearings. With two worms on the same shaft, each driving intoa separate worm gear, it is possible to make one of the worms right-hand thread, and the other left-hand, in… … 144 MACHINE DESIGN There are few mathematical equations necessary for the dimen-sioning of a worm and worm gear. The formulas for the tooth partsas given on pages 131 and 132 apply equally well in this case. Practical Modification. The discussion of the efficiency E ofthe worm and worm gear is more…
Machine design
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