Grinding, Wheels, Machines, Methods: Information on Modern Practice in the Production and Application of Abrasives, Grinding Wheels and Grinding Machines |
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Page 10
... spindles must be of the best material with ample bearing sur- faces and large , well - made boxes . Greater economy in the production of special shapes ( form grinding ) has resulted from the wide - wheel practice . Production has been ...
... spindles must be of the best material with ample bearing sur- faces and large , well - made boxes . Greater economy in the production of special shapes ( form grinding ) has resulted from the wide - wheel practice . Production has been ...
Page 39
... spindle and running true , may be removed and when remounted will run true again within the limits required in every ... spindles and arbors so that wheels can be interchanged without re - bushing . There are cases , however , where it ...
... spindle and running true , may be removed and when remounted will run true again within the limits required in every ... spindles and arbors so that wheels can be interchanged without re - bushing . There are cases , however , where it ...
Page 40
... spindle and the flanges tightened . The diam- eter of the hole should be from .002 " to .005 " larger than the diameter of the spindle on which the wheel is to be mounted . If the hole is smaller , breakage may occur by forcing the ...
... spindle and the flanges tightened . The diam- eter of the hole should be from .002 " to .005 " larger than the diameter of the spindle on which the wheel is to be mounted . If the hole is smaller , breakage may occur by forcing the ...
Page 47
... spindle enclosed in a steel protective shell , and oper- ated at a speed about 50 % above that at which the wheels are recommended to be run normally . Since the centrifugal force tending to break a grinding wheel is proportional to the ...
... spindle enclosed in a steel protective shell , and oper- ated at a speed about 50 % above that at which the wheels are recommended to be run normally . Since the centrifugal force tending to break a grinding wheel is proportional to the ...
Page 64
... spindle is loose in its bearings , or the machine has a poor foundation , vibrations result and harder wheels are required than would be nec- essary if the machine were in proper condition . Vibra- tions from any cause necessitate the ...
... spindle is loose in its bearings , or the machine has a poor foundation , vibrations result and harder wheels are required than would be nec- essary if the machine were in proper condition . Vibra- tions from any cause necessitate the ...
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Common terms and phrases
abrasive grain abrasive wheels aluminous abrasive aluminum oxide Alundum angle bearings bond bushing Carbon Cast Iron Chilled Iron chine chuck clearance coarse corundum crankshaft crystals cup wheel cutter cutting edges Cutting-off Cylindrical Alun Cylindrical Crys Cylindrical Grinding Machine depth of cut designed diameter diamond drill Elas employed flanges Floor Stand gear Grain and Grade grain depth grinding operation grinding wheel ground hard hardened steel harder wheels high speed steel hole internal grinding lathe lathe tool manufacture master cams material metal method milling cutters mounted Off-hand pins plane polishing production removed Roll Grinding rough grinding rubber shaft shape Sharpening Alun shoe silicate silicate wheels silicon carbide Snagging Alun soft softer wheels spindle steady-rest straight wheel Surface Grinding Machine surface speed Surfacing Cups Swing Frame taper tensile strength tion tooth rest truing vitrified wheel face wheel slide wheel speed wheel wear
Popular passages
Page 365 - ENGINEERS. speed of the work is usually very much less than the speed of the wheel, this distance QW will be much less than OQ. The cutting point will remove from the work a chip represented by OQW. From the outline or shape of the chip it appears at once that when the cutting point begins to act at...
Page 38 - For the higher temperatures, a platinum thermo-couple is used, one wire of which is composed of pure platinum, and the other of an alloy of platinum and rhodium. The...
Page 367 - QW increases and vice versa; but QW depends upon the speed of the work. Therefore if the speed of the wheel remains constant, and the speed of the work increases, WS will increase. The correct working of the wheel therefore depends upon the relation of QW to OQ, or upon the relation of work speed to wheel speed. If the wheel speed and all other conditions except work speed remain constant, the grain depth will increase as the work speed increases, and diminish as the work speed diminishes. Also the...
Page 109 - In order to grade the clearance properly along the drill lip from point to periphery and curve the back side of the cutting edge so that maximum endurance and strength, consistent with free cutting, are preserved at all points, it is necessary that every portion of the cutting lip should, while being ground, rock against the grinding wheel in a path very similar to that in which it travels when at work. If, while at work...
Page 370 - In applying the principle that grain depth of cut is the main factor in all the phenomena of a good grinding wheel, it must be remembered that the correct relative speeds of work and of wheel must be found by trial for each wheel and each kind of work. When this has been done, the principle of grain depth of cut will enable one to know the direction in which to make the changes of work speed or wheel speed, to adapt the wheel to changes in its own diameter, or to other sizes of the same kind of work.
Page 366 - Work in the same manner as the single grain considered. The grain depth of cut of each particle, however, will be the distance WS divided by the number of cutting grains or particles in action at once, or the number between 0 and Q. When a grinding wheel is working properly, the abrasive grain in the wheel may be considered as cutting small chips from the work and the surface of the work as cutting or wearing away the bond of the wheel. Now, it is quite evident that the greater the grain depth of...
Page 71 - Wheels subjected to bending strains should be made by elastic or rubber process Extremely thin abrasive saws must be made by the elastic or rubber process Wheels over...
Page 370 - Thus far it has been assumed that the object of grinding is to remove stock rapidly or, in other words, to get a high rate of production. Often, however, the character or finish of a ground surface is of primary importance. From the point of view of grain depth of cut, we should reason that to get a very smooth surface by grinding, the grain depth of cut should be very small, and therefore that the work speed should be relatively slower for finishing than for roughing. 12 That the bond may be worn...
Page 374 - ... depth; but these changes, which have not varied the theoretical value of grain depth d have increased the rate of production 40 per cent. This indicates that production may be increased without increasing grain depth of cut, by increasing the radial depth of cut, and at the same time diminishing the work speed a less per cent, than the radial depth is increased. In practice this method of increasing production supposes that the work and the machine are reasonably rigid. SUMMARY...
Page 369 - Summarizing these conclusions, to which we are led by purely theoretical considerations, we can say: a Other factors remaining constant, increase of work speed increases grain depth of cut, and makes a wheel appear softer b Similarly, a decrease of wheel speed increases grain depth of cut c Similarly, diminishing the diameter of the grinding wheel increases grain depth of cut, and increasing the diameter of the wheel decreases grain depth of cut d Similarly, making the diameter of work smaller increases...