The Metal Turner's Handybook: A Practical Manual for Workers at the Foot-lathe: Embracing ... by Paul Nooncree Hasluck

Author:Paul Nooncree Hasluck
Language: eng
Format: epub
Publisher: C. Lockwood and Son
Published: 1906-03-25T05:00:00+00:00

Fig, 91. Morse's Drill Grinding Macjiinb

^he stone* When an attempt is made to turn the winch by One hand, and hold the tool by the other, nn satis factory results are obtained* For ordinary tool-grinding, sufficient speed is got by turning a two-feet stone as fast as convenient by a treadle. With a hand-winch the speed is much too slow* When steam-power is used to drive, a surface velocity of three to foiir miles per minute is sometimes attained for special purposes, Ransome*s patent free-grit stones^ made by the method previously mentioned, are asserted to have a tensile strength of about six hundred pound's per S'^iiare inch, and the

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THE METAL TURNER'S RANDYBOOK.

best results are attained with a surface velocity of from two to foiir thousand feet per niiiiote.

For grinding the twist-drills, now so generally used m

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