| 摘要 |
958,089. Machine tool details. MICHIGAN TOOL CO. May 24, 1962 [June 20, 1961], No. 20099/62. Heading B3B. [Also in Division G1] A machine tool table 16 or other object is rotated through a desired angle by placing thereon an instrument having a base 12 with a flat undersurface 14 incorporating holding magnets 15 and upwardly facing circumferentially spaced teeth 19 engaging similar teeth on a carriage 13 carrying a mirror 35. By raising a handle, pivoted at 24 to a vertical post 22 secured to the base 12, cams 25 allow a spring 28 to raise carriage 13 so that the circumferentially spaced teeth are disengaged and carriage 13 is rotated so that a zero mark thereon is aligned with the zero of a scale marked on the base 12 as seen through a transparent skirt 33. The handle is then lowered and cams 25 press carriage 13 downwardly to re-engage the teeth which are so tapered that the carriage is brought into concentric relationship with base 12. A collimator is set up so that the mirror 35 is perpendicular thereto, the handle and cams 25 are raised, carriage 13 rotated through the desired angle and cams 25 lowered. By turning the table 16 back until mirror 34 is again perpendicular to the collimator the table 16 has been rotated through the desired angle. Alternatively in checking calibrations on the table 16 if it is rotated back through the desired angle as denoted by the calibrations thereon any error may be measured within the collimator eyepiece. |
