The Helix

[Keith Hayes]

I found I needed more parts, so cut some more trapezoid today. I neglected to show the temporary gluing process before.

Masking tape is applied to both the template and the part to be trimmed. Don't get the stuff that is marked, "won't peel paint, " because it is worthless. I got some super glue at the local hardware store. Applied a short line--don't be stingy,  but don't go overboard,  either. Clamp the parts together and wait 5-10 minutes.

The tape backing is designed to prevent paint from seeping through: same goes for the CA. Because the tape has adhesive applied very evenly across the tape,  it is great in shear, which is the force being imparted on the part by the trim blade. If you don't the CA in 4 drops in a zig-zag pattern, that will also maximize resistance to the lateral force.

When you are done, use a chisel to pry the pieces apart: the tape is less good in tension and will peel off the plywood.