Modern machine-shop practice; operation, construction, and principles of shop machinery, steam engines, and electrical machinery by Rose Joshua

Author:Rose, Joshua
Language: eng
Format: epub, pdf
Tags: Electric machinery, Machine-shop practice, Machinery
Publisher: New York C. Scribner
Published: 1901-03-25T05:00:00+00:00

end of the jaws, because work shorter than the length of the jaws, or requiring to be held as far out from the jaws as possible, does not have contact at the back end of the work holding jaw faces, hence the jaws are apt to wear, in course of time, taper. By cutting away the jaws at the back, the tendency to unequal wear is greatly reduced, hence this plan is adopted to a more or less

DRIVING WORK IN THE LATHE.

237

ft

dej^ree in the dogs or jaws of all chucks, being in many cases merely a small recess from ^ to \ inch deep only. When the jaws have a V-groove as in the cut, the face F of the

Fig. 828.

chuck does not form a guide in setting the work, the truth of the V-grooves being solely relied upon for that purpose.

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