The Promise of Pinch Dogs

This week I conducted a quick experiment: I jointed a couple of warped scrap bits to see how the pinch dogs I received last Christmas would work. The first thing I learned is that pinch dogs want roughly even surfaces: I knew they could go around corners (for mitered joints or more difficult multi-angle glue-up), but it didn't seem likely that they would work on the ends if the surfaces were not relatively coplanar.

Out came the hand saw (it was late and children were sleeping) and I cut down the longer board to roughly the same length as the shorter board. Then I smeared both edges with glue and started pounding in pinch dogs.

Thats when I learned that this tool could benefit from a little help when being applied. I would have liked to have a couple straight pieces of wood clamped together on each end of the work piece to keep the boards in the same plane. It also would have worked better if the boards were lightly held in place on the bench and had not been cupped (and therefore more like a rocker than a pedestal).

Even with these challenges, I managed to clamp the boards using these glorified staples, and set the assembly aside to dry. That was Monday night. When I came back to it this evening, I set it on the bench and it looked like the picture at the top of the page. The joint looked tight in spite of the trouble I had during glue up, but the rough cut surfaces and misaligned edges could be hiding the reality.

To get a closer look at the joint, I planed the surface down until the joint was revealed. Sure enough, the pinch dogs had done their job and held the joint tight. If you look closely at the picture below, you might see the joint, but it is tightly glued. The holes are visible where two pinch dogs held the joint together on the surface, but there will be many projects where that holes like that will be concealed. I expect to use these for the bench project I'm working on now: the holes won't be visible on the underside of the benches, and I've rough cut the stock long enough that I can trim off the ends after glue up.