Handbook for machine designers, shop men and draftsmen (1916)
Halsey, Frederick A. (Frederick Arthur), 1856-1935 · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 367
oned, it has been believed that adecrease in pressure was general when they were used in punchingthin plates, but the results of these experiments do not confirm this.The bevel and spiral punches crowd the metal to the walls of the die,thus producing unnecessary friction, whilethe real cutting… … Clearance
Machine design
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
