| 摘要 |
PURPOSE:To quickly process a correct pitch hole on the part to be worked, by arranging positioning pins inserted into one part of pitch holes of a jig plate and that of the part to be worked, and a tool guide provided on the lower face of the other part of the pitch hole of the jig plate. CONSTITUTION:A positioning pin 9 erected on a plate like jig plate 8 is inserted into the piston pin inserting hole 4 of a connecting 3. Then, a crank pin insertion hole 5 which is the other part of a pitch hole of the connecting rod 3 is interfaced with the other part of the pitch hole 7 of the jig plate 8, and a honing tool 1 is descended from the upper part thereof. And, the tip of this honing tool 1 is interfaced with the guide hole 10 of a tool guide 11 fixed to the lower face of the jig plate 8. Simultaneously with the rotation of the housing tool 1 a grind-stone 2 is expanded, and the internal surface of the crank pin insertion hole 5 of the connecting rod 3 is subjected to honing. |
