BY HANDYMAN
Page 52
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IN order that high-speed gears will have I. maximum load capacity for their particular duty and size, it is necessary to use case-hardened steel in their manufacture. Therefore, right away there can be a disadvantage because of inaccuracy brought about by distortion during hardening. The only answer to this problem is to profilegrind the teeth as a final operation. For this purpose spur teeth are ground by abrasive wheels, which are usually trimmed by a diamond-tipped tool to the profile required.
With spur or helical gears it is a common practice to use two wheels. These wheels have working surfaces that correspond exactly to the flanks of finished teeth. An example in the range of profile-grinding machines is the "Maag", a machine that is used extensively on gear work.
Here, the abrasive wheels are stationary and the machine rolls the work about them in the fashion of a gear wheel rolling along a toothed rack. Apart from the rolling action, there is to and fro motion in order that the full tooth area is covered by the abrasive wheels. Normally a pair of tooth profiles are