| 摘要 |
PURPOSE:To eliminate fear of generating unevenness on the ground surface, which is otherwise involved with wear of a grinding wheel, by supporting an object to be ground always with a constant pressure even though the grinding wheel in this planetary grinding machine has worn. CONSTITUTION:A rotary ring 34 rotates together with a shaft 33 for orbiting of grinding wheels 111, 112 and rotary shafts 121, 122, and at the same time is movable along said shaft 33. The moving speed of these rotary shafts 121, 122 is adjusted by controlling the number of pulses per unit time to be fed to a pulse motor so that the torque of a motor to drive the grinding wheels 111, 112 will become constant. This adjustment provides maintaining the torque required to rotate the grinding wheels in a constant condition, which holds in turn the pressure of the grinding wheels to the object to be ground constant. Accordingly such a conventional fear as producing unevenness in the ground surface in compliance with the wear of grinding wheels can be eliminated. |
