Turn′ing-gage.
An instrument to assist in setting over the tail-stock of the lathe, so that a given taper in a given length of work may be obtained. To find the taper for a certain number of inches in length, the shank A′ of the gage is inserted in the toolstock of the lathe; a straight shaft-arbor with a uniform diameter is then adjusted upon the center points of the lathe; the tail-stock carrying the dead center is then set over either to or from the tool, as the case may require, so that when the tool is traversed back and forth upon the surface of the shaft the distance through which the taper is to be turned, by moving the slide-rest of the lathe, it shall force in the self-adjusting bar D, thereby rotating the shaft C, carrying the head with the pointers E sufficiently to indicate the exact taper required; this is done by approximation, the motion of the pointer through an inch, its multiple, or its fractions, on the dial through the given traverse of the slide-rest, giving the required position of the back center. |
| Turning-gage. |
