Grits and Grinds, Volumes 4-5Norton Company, 1912 - Grinding and polishing |
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Popular passages
Page 16 - He who ascends to mountain-tops, shall find The loftiest peaks most wrapt in clouds and snow ; He who surpasses or subdues mankind, Must look down on the hate of those below. Though high above the sun of glory glow, And far beneath the earth and ocean spread, Round him are icy rocks, and loudly blow Contending tempests on his naked head, And thus reward the toils which to those summits led.
Page 10 - A loaded wheel is one whose face has particles of the metal being ground adhering to it — one in which the openings or pores of the wheel face have been filled up with metal, leaving no room for clearance. It is not necessary that all of the pores or openings between the cutting particles on the face of a wheel be filled up or loaded to prevent the wheel from cutting. The presence of a number of these pieces of metal on the face of a wheel prevents the wheel from cutting into the work and the loaded...
Page 5 - When numbers of duplicate pieces are to be produced and a small fillet is allowed, not only can the cylindrical portion be roughed with the lathe and not at all refined, but the shoulders can also be roughed, because the grinding machine, when required, is provided with a locating bar. By the use of this bar, the exact location of all shoulders can be secured by grinding and without measuring. At the same time the cylindrical portion can be ground with the same grinding wheel. The roughing in the...
Page 10 - ... glazed and loaded wheel is as follows: The cutting face of a loaded wheel has particles of the metal being ground adhering to it, the openings or pores of the wheel-face having been filled up with metal, thus preventing the wheel from cutting freely. A glazed wheel is one having cutting particles that have become dull, or worn down even with the bond, the bond being so hard that it does not allow the dulled cutting particles to be torn out of the wheel. Continued work with a wheel that glazes...
Page 12 - Excessive dressing wears wheels faster than grinding. If too much dressing is necessary, it is an indication that the wheel is too hard for the work, or that it is speeded too high.
Page 6 - ... whatever angle the roughing turning tool may form. Next grind the cylindrical portion and at the same time cut out the angle at the shoulder with the grinding wheel. The work should then go to a lathe where a more skillful operator can locate the shoulders exactly ; if a sharp corner is really necessary it can then be made.
Page 3 - ... when in reality they are not roughing at all, but simply turning to a certain degree of refinement with the notion that by so doing they are (a) doing a creditable job, and (6) that they are helping the grinding machine. It is difficult to secure roughed work from lathe operators, ie, work that is not in any sense refined. Tradition impels nearly all to consume much more time than would be necessary if the work were merely roughed, roughing being confused with a certain degree of refinement....