| 摘要 |
PROBLEM TO BE SOLVED: To lower the rate of occurrence of chipping in the corner or the side surface of a quartz piece by providing a buffer member in the axis position of each pipe in a device for rotatably supporting a pipe for containing a quartz piece and a polishing material in plural positions away from the axis of a rotatingly driven drum. SOLUTION: A quartz piece 3 as a quartz vibrator is formed as a parallel plate, and the corner parts of both surfaces thereof are polished by beveling or convex machining to provide a structure having little secondary vibration and vibration loss due to the influence of a contour. A machine tool for polishing comprises a metallic pipe 1 rotatably supported in plural positions away from the axis of a rotatingly driven drum 2. A quartz piece 3 is put together with polishing material in the pipe, and the drum 2 and the metallic pipe 1 and individually rotated to transfer the shape of the inner peripheral surface of the metallic pipe 1 to the quartz piece 3. In this case, a buffer member 4 is provided in the shaft center in the metallic pipe 1, thereby preventing chipping in the quartz piece 3 when polished. |
