Modern Toolmaking Methods: A Treatise Om Precision Dividing and Locating Methods, Lapping, Making Forming Tools, Accurate Threading, Bench Lathe Practice, Tools for Precision Measurements, and General Toolmaking Practice
Modern Toolmaking Methods: A Treatise Om Precision Dividing and Locating Methods, Lapping, Making Forming Tools, Accurate Threading, Bench Lathe Practice, Tools for Precision Measurements, and General Toolmaking Practice
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...ground to angles advantageous for very hard brass. The angle is such that the face of the cutting edge is f inch ahead of the center at the successive grindings. At C the chaser is ground with a negative rake, the cutting edge being inch below center. This form is used occasionally for certain classes ...
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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...ground to angles advantageous for very hard brass. The angle is such that the face of the cutting edge is f inch ahead of the center at the successive grindings. At C the chaser is ground with a negative rake, the cutting edge being inch below center. This form is used occasionally for certain classes of work, such as very soft "greasy" brass. The chaser shown at B is ground in a way to give the best satisfaction for all-around work. The cutting edge is ground so that a line passing through the face also passes through the center of the work. On the other hand, diagram D shows a very poor way to grind a chaser whether for brass or steel, as the angle of the cutting point changes with each successive grinding, and while such a chaser may cut satisfactorily on some work when nearly new, it is not likely to do so after one or two grindings. In grinding the chamfer on a brass cutting chaser, a wheel about the size of, or very slightly larger than, the piece which the chaser is intended to cut, should be used. The relation of the wheel to the chaser when grinding the chamfer is indicated at E and F. In sketch F, the circle / represents the stock to be cut, and g the emery wheel used for grinding the relief of the chamfer. As will be seen, the center of the emery wheel is a trifle below the center of the stock, and somewhat toward the right. At E is shown the relation when grinding a chaser for hard brass. Extreme care must be taken, in grinding, not to draw the temper of the cutting edge. As a general rule, except for the very hardest brass, there should be as little relief as possible back of the cutting edge of the chamfer, because this part of the die steadies the chasers when starting the thread. It is of advantage when grinding...
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All Editions of Modern Toolmaking Methods: A Treatise Om Precision Dividing and Locating Methods, Lapping, Making Forming Tools, Accurate Threading, Bench Lathe Practice, Tools for Precision Measurements, and General Toolmaking Practice
