A treatise on the construction and use of milling machines made by Brown & Sharpe mfg. co., Providence, R.I., U.S.A., manufacturers of machinery and tools by Brown & Sharpe Manufacturing Co

Author:Brown & Sharpe Manufacturing Co
Language: eng
Format: epub, pdf
Tags: Milling-machines -- Catalogs
Publisher: Providence, R.I., Brown & Sharpe manufacturing co.
Published: 1896-03-25T05:00:00+00:00

inclination of 10 degrees from the radius, the cutting angle in this way being 70 degrees and the clearance angle 10 degrees. cl /?J?i? ce The relief or clearance of mills we think should usually

of Mills. *

be about three degrees, and the land at the top of the teeth from .02 inches to .04 inches wide before the clearance is cut or ground.

On cotter mills, page 135, the clearance should be at the outside of the two teeth, as the cutting is not done directly upon the end; but this clearance should usually be only about one-quarter of that on other mills.

Mills to cut grooves should be hollowing about five one-hundreths in one inch for clearance, that is, a grooving mill should be about one one-hundreth of an inch thinner at one inch from its edge or circumference than it is at the edge. Our grooving mills are given a limit of two one-thousandths in thickness. Mills made to exact thickness are very expensive. In cutting grooves that are to have some parts of their sides nearly or quite parallel, it is well to leave considerable stock, for the finishing cut, as mills like taps do better work when they can get well into the stock.

For the same reason if the sides have to be left slanting before the finishing cut is taken, no part of either side should slant less than three degrees, or about one -£$ of an inch in each inch.

Clearance in a fly cutter is obtained by moving the cutter towards a, Fig. 20.

sketches A sketch of a mill with a solid shank, or of a formed of Mills. cutter t h a t has half of its outline unlike the other half, should clearly show which way the mill is to turn. This can be done by an arrow, as shown on page 135, or by writing the word " coming " either at the top or bottom of the sketch, as the case may be. This cut also shows how the terms right and left are applied to angular cutters and mills. It is well to show the work in red lines in the position that it will occupy when cut by the mill.

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