A miter sled is a useful jig for making perfect 45-degree mitered corners. I made a video about this a while ago, but I think my instructions and demo were overly complicated. This version is super-easy to make and only requires one perfect 90-degree angle in its construction.
I used 3-quarter-inch plywood for the base, and quarter-inch plywood for the runners. Watch the snazzy way I use pennies when I’m gluing the base to the runners!
Use a 45-degree triangle, cut the strip, and, using the line you drew along the edge of the triangle, glue the strip of wood as a fence on the base.
Have fun with with your miter sled! You’ll get a picture-frame-perfect angle every time you use it!