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"It's paradoxical that the idea of living a long life appeals to everyone, but the idea of getting old doesn't appeal to anyone."
Andy Rooney
When I started woodworking, I didn't know squat. I have progressed in 30 years - now I do know squat.
I have never had a combination square that is an accurate as any of the Woodpecker's squares. I use a Woodpeckers MFT Square to square up the miter head on my Festool MFT table. It's perfect. I have other Woodpeckers squares. They also appear to be perfect 90's. I guess the problem with all squares is to find a standard to compare to. I have always found that the simple plastic triangles (30, 60, 90 and 45) that you buy in art or drawing stores to be very accurate. So that might be a good comparison. Or, maybe we're all just a little too concerned about "perfectly square". I do know, however, that Woodpeckers squares are CNC and laser cut and labeled and that, when using them, I never have anything out of square if it shows square on a Woodpeckers tool.
Regarding the comments that you should not check a square with a square and the only way to check for square is flip and mark.
I am not disputing that, but on the topic of Starrett, they make a 6 inch machinist square, now made in China, 3020-6, for a couple hundred dollars. However, for $481, they make a made in USA Master Precision 6 inch square.
https://www.amazon.com/Starrett-20-6.../dp/B0002FUMA6
https://www.starrett.com/details?cat-no=20-6%20W/SLC
I figured for someone who owned this square, it would be something where one could perhaps check square with a square.
I dont know the model of Mititoyu I have but it says DIN 875/0. I emailed them past on my caliper and how beaten it is after a lift time of us and it still works perfectly. Plan to go out and visit them sometime with this square. I need to clean it really well then like to have it checked after all the years on it.
I guess everyone knows new framing squares are much worse. Bought a framing square to use on first job . Tested it at home and saw
it was off. Told an older guy on job that the square was off ! He said “ they are all off ,you gotta file them, and flip over and file.
I never turn down an old ,cheap framing square, Some are crazy heavy!
Using a cylinder square on a surface plate to check squares is the ultimate way but a bit exxy so I would use a good quality 123 block instead on a good flat surface. The best bang for the buck is to use geometrical drawing squares which are super accurate instead of a combination square but the Starrett will do me.
Chris
Everything I like is either illegal, immoral or fattening