A discarded Maruthi Suzuki Van rear view mirror provides a ready made ball and socket joint and an additional semi-circular degree of freedom for the PCB vice. The old mirror is removed by placing the whole assembly in boiling water, the plastic expands and the old mirror comes out smoothly. The flat surface originally seating the mirror forms a perfect base for the PCB vice. An Aluminum tower bolt used for fastening doors forms the second major component.
Step 2: TOWER BOLT REWORK
The tower bolt forms the heart of the adjustable screw moving mechanism. In this step three grooves are cut in a standard 1/2 inch steel nut using a hacksaw. This modified nut is used as a die to form threads on the aluminum rod removed from the tower bolt. A long groove is also cut in the tower bolt housing. The movable jaw of the PCB vice will move within this groove.
Step 3: SHEET METAL PARTS
Sheet metal parts are made using 1/16 inch aluminum sheet. The PCB vice base plate is cut using the mirror which was removed as a template. The fixed and movable jaws of the vice are cut from the sheet using paper templates and bent into suitable shapes.
Step 4: SCREW NUT AND HOUSING
The threaded tower bolt rod is fitted with a aluminum gusset of 1/4 in thickness using tapped holes and screws. The movable jaw would be screwed onto the front end of the gusset. The grooved housing is trimmed to size and the end stop made ready. A 1/2 in steel nut modified with three spokes tapped and fitted at 120 deg would be used to provide linear movement to the movable jaw.