Benjamin, Charles Henry, 1856- [from old catalog], Hoffman, James David, 1868- [from old catalog] joint author · New York, H. Holt and company · leaf 295
X Fig. 128.Small Hand-power Punch Fig. 128 shows a small bench tool, used for punching sheetiron and other thin metals. Because of its simplicity only twoparts of the assignment will be given. All other necessaryassumptions may be made by the designer and a complete setof calculations and drawings… … Fig. 129. Hand-power Punch and Shear The hand-power punch and shear is strictly a bench tool foroperating on light work. The force at the end of the lever arm Ishould not be greater than 100 lb.; V is the eccentricity of thecam, a is the distance from the pivot point of the shear arm tothe point…
Machine design
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