American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 235
rid of. The angle of escape (E d D, Fig 3) is df thegreatest importance, varying with the natureof the materials being acted upon. If the angleis very small, the action of the tool is rather thatof scraping than of cutting, and the matter re-moved is more like powder, unless the materialis very… … of the drills of this kind are made, the smootherthey will cut; for so long as the upper surfaceis at right angles to the work, increasing theangle of relief only increases the force requiredto wedge back the shaving, and at the sametime the tendency to dig. When the cuttingedges of such drills are…
Clocks and watches
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