Lee Valley Tools    Woodworking Newsletter
   Vol. 6, Issue 4
   March 2012
 
   Angle-Clamping Jig
 

For one recent turning project, I needed to clamp surfaces that were 30° apart, a job beyond the ability of bar clamps, pipe clamps, C-clamps or quick-grip clamps. To remedy the problem, I came up with an angle clamping jig, which made a potentially frustrating session in the shop into a routine clamping job.

You can build the jig out of scrap pieces of 3/4" plywood. The only items I purchased were two 3/4" round bench dogs and two 3/4" round Wonder DogsŪ, but even these could be shop made if you have the right tools.

Problem project   Angle-clamping jig
The "problematic" project   Isometric view of the angle-clamping jig

The Cut List
You will need
  • 20" x 9" x 3/4" (1) plywood piece for the top
  • 20" x 6-1/2" x 3/4" (1) plywood piece for the substrate
  • 20" x 7-1/4" x 3/4" (1) plywood piece for the shelf
  • 20" x 4-3/4" x 3/4" (2) plywood pieces for the legs
A Note About the Design
The holes are spaced 3-1/2" apart instead of 4-1/2" to 5", which makes it easier to place the Wonder Dogs in the correct position to clamp different types of glue joints. The jig could be built without the shelf, which would allow the top and the substrate to take the strain put on the bench dogs and Wonder Dogs. However, the addition of the shelf means that the holes in the top do not become oversized with use. Without the shelf, each hole in the top and substrate is deformed in two directions; it is pushed forward by the clamping pressure and pushed backward by the torque. With the addition of the shelf, the whole of the top and substrate resists the clamping pressure; the torque is controlled by the shelf with its greater mechanical advantage.
 
 
           
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