| 摘要 |
PURPOSE:To improve the positioning accuracy of jig elements against a surface plate by contacting projected positioning members against at least two recesses. CONSTITUTION:Plural rows of screw holes 10a are arranged in thick surface plate 10 where each hole 10a is provided with a recess 10b enlarging upward. While an annular body 16 formed with smaller inner diameter than the outer diameter of steel ball 13 is arranged at the joint face 12 side of said recess 10b. While tapered holes 11a are made at the opposite sides of through-hole 11c to be inserted with a bolt 15 then a steel ball 13 is fitted to form a projected positioning member. With such structure, it will function to enlarge the outercircumferential edge of the stopper board 14 to block motion thus to improve the positioning accuracy. |
