Sometimes jigs are fancy things, made by a CNC out of billet, sometimes they're lovingly and meticulously hand-crafted from hardwood and finished like a piece of fine furniture.
They always serve the same purpose...to allow repetitive precision.
To that end, I show you my humble, yet accurate roof-pitch-matcher....my current favorite 'jig':
It's neither made by machine from an exotic alloy, nor lovingly hand-crafted from hardwood. It's just a piece of 5/8"ply screwed onto a scrap of Cypress. I laid out an exact 5:12 mark with a speed square, then put the two together:
I've used it all day for the last two days and it's been doing its job quite well.
Not all jigs are fancy things...huh?
- Marty -