I have a need for a 45 degree jig for a project coming up and didn't want to spend much to purchase one. Here is what I came up with.
- The bit sizes are 1/4" and 1/2" (though the tolerances may be a bit tight and you may need to drill out a small amount your first time using it.
- The distance from the drill hole to the edge of the board is adjustable using the stopper
- The stopper holes are 1/4" apart
- The 'keyhole' design of the stopper pins allow you to rotate the stopper to get approximately 1/8" precision when setting the distance.
- There is a 'sight' to ensure side-to-side alignment
- The sight extends through the jig to the surface.
The stopper rod is a bit weak when using my printer and I kept breaking them. I've added a 'rod' file that should have improved strength if needed.
The stopper can be a bit fragile with standard settings. Increase the wall thickness and the infill percentages to get a sturdy piece.
For the stopper, I used a 40% infill and triple the standard wall thickness for my printer.
OpenSCAD is my go-to tool for precision modeling. I can create and re-use portions of my model. You'll note that the stopper is printed in 3 pieces that don't separate, but allow movement. That movement is a bit more than I expected, but meets my needs. Feel free to re-design to fit your own needs and let me know how it comes out! :)