Thales Triangle Ends

I hate storing jigs, as most of the time i need a jig for a particular application and it never gets re-used and i end up storing it simply because i spent an time making it.

Thales Triangle if you're not familiar with the process allows you to determine whether your right angle is too obtuse or acute depending on which arm is moving.

All you need is a couple of scrap timber, secure these to the ends of the timber and connect them together to form an isosceles triangle. with a pivot.

There's plenty of youtube videos explaining the process if you want to know more details.