OK, lets get started. I will go through the build process in the same order that I built the bench and as a non-working concept of wedge power would have been a deal breaker, the first job was to build a wagon vise or two to make sure they would work. I was fortunate enough to find a small local mill that would sell me some really nice local arbutus (madrone in USA). This is about 50 fbm and I have about ten left over.
After milling up some nice 1 7/8” stock and a bit of 3” I made up the main pieces. For the sake of getting it done quickly and easily ,the slide tracks for the wagon are just strips added on to the side rails with hot hide glue. The attached sketchup shows it as milled out of a single piece. For what it’s worth, I never changed it because it works just fine.
The load bearer here is a modified joint that boatbuilders use to attach headers and jack beams in wooden deck construction. It has great load distributing characteristics and in this iteration I have left a 1/8” space at the front side of each of the “ears” to allow it to move forward and loosen when not under pressure from the wedge. This allows it to pop out very easily but doesn’t compromise it’s load bearing ability. The first photo shows the block in load bearing position and the second in the loosened position, ready to pop out.
The wedge surfaces were just band sawn and smoothed with a chisel.
The wedges and shims are detailed in the sketchup. The important feature is the angle of the wedge. If too shallow you don’t get enough travel (and it will be really hard to drive out) and if too steep it won’t stay in, ei: it will pop back out. My first intuition was to go for 1/2 ” travel in the height of the block. I chose this because I’ve used wedges for years and it looked about right. It turns out that it worked perfectly so I didn’t try any others. That slope expressed as an angle was 8 degrees. Maybe others will work as well. I don’t know because I didn’t try after the first one worked so well.
So far, with my bench dog holes 6” apart and the three holes in the wagons spaced at 2” intervals, I haven’t found any length that I can’t accommodate with the shims shown, one 1” and one 1/2” each vise.
The final key to this simple little construction is a critical one. It is important that the sides of the vise be unable to spread as the wedge base block is pushed back into its seat. To assure that this was solid I let the vise bodies into the solid back member of the bench.
I have made one more little tweak that really helps. It is shown in the video in the first segment of this blog. I made some “eccentric wagon dogs”. Sounds like an application to the Kennel Club is in order I know. What these little guys do is allow you to fine tune the height of the wedge to clear your plane. Here’s a better photo of them.
Here’s the sketchup. You can get all the measurements from it. The only ones that really matter are the angles of the inclined planes. the rest can be modified to suit the size of your bench and the dimensions of your available material.
Because this vise is completely self contained, you dont need to build it into a new bench during construction. To retro-fit it in any bench, all you need to do is cut out a hole that matches its outer dimensions and drop it in. A little hot hide glue, epoxy or pva will make it a permanent fixture.
That’s it. It’s just too easy.
Next we’ll start cutting up the three sheets of 3/4” plywood (give or take a bit) that make up the entire structure of the bench.
Thanks for looking in
Questions comments and critiques are always welcome.
-- Paul M ..............If God wanted us to have fiberglass boats he would have given us fiberglass trees. http://prmdesigns.com/