| 摘要 |
PURPOSE:To minimize the flexure to be produced on a base through moment by setting predetermined point on a vertical line at the position where the vertical line passing through the center of gravity of a carriage is approximately half of the lateral motion. CONSTITUTION:A thrust bearing 6 is secured onto a base 1 corresponding to half of the distance S of motion passing through the center O2 which is the cross- point between a vertical line passing through the center of gravity O1 of a body composed of a column base 5, column 4, grindstone wheel 10 and shaft head 11, etc. and the sliding face 1a of base 1 and supported such that it is secured axially at the leading edge of a feed screw 9. An operating handle 7 is rotated to slide the column base 5 on the sliding face 1a in arrow direction through the feed screw 9 and nut 8. Since the moving distance is 1/2S to the opposite sides from the bearing 6, the flexures delta1, delta2 to be produced in the base 1 through the moments M1, M2 can be minimized. |
