For those who can't afford a tracksaw guide rail square...make this

[ChuckM]

Link shared by a friend:

 

[Michael Kellough]

Thanks for that Chuck!

Thale’s square I’d never heard of and Schrödinger's square is a good joke.

 

[waho6o9]

Interesting video, thank you.

 

[makpacman]

Knowledge that's relavent 2500 years later has legs far greater than cost savings.

Great post. This epitomizes what I like about craftsmanship.