Wet Grinder Scissors Jig

2024-01-06 02:09:05

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Summary

Wet Grinder Scissors Jig Notes

I designed this scissors jig to work with a Tormek T-7 wet grinder, which has a 15/32" diameter support bar, but it can be modified to work with others. I made mine from PLA, which is adequate for this application.

You will need one jig support, one lower clamp, two upper clamps, and three knobs.

The large longitudinal hole in the jig support is slightly wedge-shaped, so it should hold the bar better than a simple round hole. Because plastic is fairly slick, however, I recommend super-gluing two 1/2" x 1/4" strips of 400 grit wet-or-dry sandpaper onto the two flats of the wedge just inside each of the two ends of the hole (four total) for additional holding power.

I sized the small perpendicular hole in the jig support to be tapped for standard U.S. 7/16" bolts (1/4 NC 20). Make sure you set the wall thickness of your print to enable plenty of holding power without stripping the hole. The holes in the upper clamps are sized likewise.

The hinge holes that connect the two upper clamps to the lower clamp are sized for 3/32" rod stock. I recommend you use stainless steel so the hinge does not rust due to water from the grinder. Mine printed well enough that I did not need to pre-drill the hinge holes. I simply chucked the hinge rod in my cordless drill and slowly drove it through all three pieces. I left 1/4" or so hanging out of one end so I could remove the hinge if I ever needed to take the jig apart.

Like the hold-fast, the plastic faces of the upper and lower clamps are slick. Therefore, I recommend you super-glue two 1/2" x 1/4" strips of 400 grit wet-or-dry sandpaper to the mating faces of the clamps to provide a good grip on your scissors.

Lastly, I sized the hexagonal recesses in each of the knobs to accept the head of a standard U.S. 7/16" bolt. It should be a friction fit: just drive a bolt into each knob with a rubber mallet, no glue required.

From there, simply watch any of several YouTube videos to learn how to use this jig. Good luck!