Benjamin, Charles H[enry], 1856- [from old catalog] · Cleveland, C. H. Holmes · leaf 94
ust equal — Usually b=— 5-1 4 For shafts of machine steel S=S, and for ironshafts S=^S nearly as keys should always be ofsteel. Substituting these values and reducing : For iron shafting l=i.2d nearly. For steel shafting l=i.6d nearly, as the leastlengths of key to prevent its fail-ing by shear. If… … S8 MACHINE DESIGN. These proportions will make the depth of key wayin shaft about = ^b and would be appropriate for asquare key. To avoid sucii a depth of key way which mightweaken the shaft, it is better to use keys longer thanrequired by preceding formulas. In American practicethe total depth of…
Machine design
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