| 摘要 |
PURPOSE:To permit the superior mirror-surface grinding work free from grinding burning by previously setting the number of times of transverse feed of a saddle per one time of grindstone cutting-in in which grinding burning is not generated and carrying-out the grindstone cutting-in at each set number of times. CONSTITUTION:Each number of strokes before and behind a saddle 6 which can perform grindstone cutting-in without generating grinding burning is set onto a setting device 15 beforehand from the kind and the ground-surface precision of a grindstone 5 and a workpiece 7. If, during grinding, a dog 9 hits limit switches 10 and 11 by the transverse feed of the saddle 6, the number of times is counted by an adder 14, and when said count number reaches the value set beforehand onto the setting device 15, a motor controller 17 gives a cutting-in instruction onto a grindstone cutting-in motor 4 by the signal supplied from a comparator 16, and the prescribed grindstone cutting-in is carried-out. At the same time, a reset-signal generator 18 resets the adder 14, and the above- described operation is repeated similarly, and the superior mirror-surface grinding work is carried-out.
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