An Introduction to Metal-working by J. Charles Pearson

Author:J. Charles Pearson
Language: eng
Format: epub, pdf
Publisher: E.P. Dutton and Co.
Published: 1904-03-25T05:00:00+00:00

Proving truth of Centreing

Hand-Turning.

[To face page 56,

TURNING

57

Instead of a square hole this form of chuck is sometimes provided with a round threaded hole; the work also being provisionally threaded at one end for insertion in the chuck. This ^screw-hole' chuck gives a very firm grip to the work, and can also be used for work of small diameter and short length which is supported at one end only.

The Poup-jaw Chuck. — The Four-jaw Chuck, Fig. 54, is used for holding work of considerable substance which can be supported at one end only. It screws on to the headstock mandrel at a (taking the place of the face-plate), and the jaws (three of which, marked b, appear in the elevation) grip the work, c, by closing in on it; they are moved radially, and independently of each other, by a screw-key applied to the nuts, as at d. The inner sides of the jaws are arranged in ^ steps,* so as to take work of larger or smaller diameter, and they can be taken right out of the body of the chuck, reversed, and inserted with the steps outwards, for the purpose of holding hollow work on the inside. The accurate fixing of the work concentrically in the chuck can be tested with a piece of chalk in the same manner as has already been described in connection with the centreing of a cylindrical piece for turning.

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