Abrasives & abrasive wheels, their nature, manufacture and use; a complete treatise on the manufacture and practical use of abrasives, abrasive wheels and grinding operation

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...by the centers. When chat tering occurs, the first thing to do is to go over the machine carefully, inspecting all adjustments, and if this does not correct the evil, some of the other above-named causes should be investigated. For the economical and efficient operation of any cylindrical grinding machine, it is very necessary that the wheel be in as perfect running balance as possible. Wheels that are out of balance cause vibration and chatter marks; they wear out spindle boxes rapidly and if badly out of balance, they are liable to burst, which means possible injury to the workman, the loss of a comparatively expensive wheel and curtailment of production until a new wheel is mounted. Wheels, as they come from the grinding-wheel manufacturer, are in balance within very close limits. It is impossible for the wheel manufacturer to make a wheel that Fig. 105.--Balancing a grinding wheel by chipping the heavy side. is in perfect running balance without some special treatment owing to the fact that the wheel texture is apt to vary slightly. Thus, one side of the wheel may be a little heavier than the opposite side. One method of balancing a grinding wheel is shown in Fig. 105. In this case, the light side of the wheel is at A and the opposite, or heavy side, is chipped away enough to counterbalance the unequal weight. This work is done with an ordinary cold chisel, but care must be used, otherwise the wheel will be broken. The Landis Tool Co. make use of the device illustrated in Fig. 106. This consists of two balancing blocks which have radial movement in an annular groove turned in the wheel holder. The blocks can be se Fig. 106.--Landis wheel-holder equipped with balancing blocks. curely clamped in the desired position by means of screws. It is a comparative...