Master Connecting Rod Presentation
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PRACTICAL DESIGN OF DRILL JIG FOR MASTERCONNECTING ROD
1
FIGURE SHOWING COMPARATIVE STRENGTH OF SIMILAR COMPONENT CASTING: <STRENGTH MORE THAN CASTING BUT NATURAL FIBRE LINES CUT ABRUPTLY FORGING: >>MOST STRENGTH AS NATURAL FIBRE LINES ORIENTED AS PER CHANGE IN SHAPE 2
WHY COMPONENTS LIKE SPANNER ARE MANUFACTURED BY FORGING METHOD? • The components like “spanner” are subjected to lot of force while tightening and loosening of nuts, hence there is a requirement of strength. That is why they are manufactured by forging method instead of machining or casting.
3
Components manufactured by forging
4
MASTER CONNECTING ROD
5
Problem: Design a drill jig to drill holes(12) on periphery of master connecting rod. (Assume: holes are previously drilled in big and small end)
6
Base plate
Chamfer
Indexing holes
Chamfer
Base plate (in Red color) Location pins: Yellow color Pins can be force fitted in the base plate instead of welding. Chamfer is given for easy loading and unloading ( To prevent jamming)
7
H- PLATE Match this hole with Centre hole in big end of master connecting rod.
H plate is a loose part of drill jig. (not the integral part).
8
Load like this
BOTTOM VIEW
ISOMETRIC VIEW TOP VIEW
9
FINAL VIEW OF DRILL JIG. ROD TO PREVENT UPWARD MOVEMENT OF W/P WITH DRILL.
DRILL BUSH
10
1
FIGURE SHOWING COMPARATIVE STRENGTH OF SIMILAR COMPONENT CASTING: <
WHY COMPONENTS LIKE SPANNER ARE MANUFACTURED BY FORGING METHOD? • The components like “spanner” are subjected to lot of force while tightening and loosening of nuts, hence there is a requirement of strength. That is why they are manufactured by forging method instead of machining or casting.
3
Components manufactured by forging
4
MASTER CONNECTING ROD
5
Problem: Design a drill jig to drill holes(12) on periphery of master connecting rod. (Assume: holes are previously drilled in big and small end)
6
Base plate
Chamfer
Indexing holes
Chamfer
Base plate (in Red color) Location pins: Yellow color Pins can be force fitted in the base plate instead of welding. Chamfer is given for easy loading and unloading ( To prevent jamming)
7
H- PLATE Match this hole with Centre hole in big end of master connecting rod.
H plate is a loose part of drill jig. (not the integral part).
8
Load like this
BOTTOM VIEW
ISOMETRIC VIEW TOP VIEW
9
FINAL VIEW OF DRILL JIG. ROD TO PREVENT UPWARD MOVEMENT OF W/P WITH DRILL.
DRILL BUSH
10
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