Machines and tools employed in the working of sheet metals by Hodgson Richard Broom

Author:Hodgson, Richard Broom
Language: eng
Format: epub
Tags: Sheet-metal work, Machine-tools
Publisher: Manchester [Eng.] Technical publishing co.,; New York, D. Van Nostrand co.
Published: 1903-03-25T05:00:00+00:00

clutch to engage and thereby stare the machine in motion. The speed of a large press, such as fig. 170, is usually about 30 strokes per minute, and the cutting-out tools would have waved cutting edges, giving shear to the tools, thereby enabling two or more complete bath bodies to be cut out at each stroke of the press.

MACHINES FOE SHEET METAL WORK.

CHAPTER XIII. DOUBLE-ENDED PRESSES.

THE [advantage of the double-ended type of geared press, fig. 171, is that two presses are fixed and worked, occupying much less space than would be the case if two single presses were-used; further, they come out at much less cost in making. When there is a great quantity of repetition work, and-not much tool changing required, then double-ended

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