Checking frames or carcasses for squereness

[Nissim Avrahami]

Good day

A friend in an UK forum, Jacobs, introduced me to this video of Steve Maskery
http://www.youtube.com/watch?v=A7RdAQj8nFc

I think that it’s ingenious

Rgards
niki

[Mark Rios]

Ok....where do I buy one?

:D

[Nissim Avrahami]

I have no idea Mark
I just made it an hour ago and got disappointed to see that some of my frames are not square.
You have to be very careful with the lengths and the vortexes. Any deviation will give you wrong reading.

In the pics, you can see how it’s creating the 90* at any position (yellow lines), so, if the short leg is in the air, the angle is less than 90*, and if one vertex of the long leg cannot touch the frame, the angle is greater than 90* (Pythagoras was talking but nobody listened to him).

niki

http://i50.photobucket.com/albums/f321/avrahami/P1-1.jpg


http://i50.photobucket.com/albums/f321/avrahami/P2-1.jpg

[Ken Garlock]

Hi. An easy way to make a right angle triangle is to use 3 pieces 3, 4, and 5 inches long: 3 in. base leg, 4 in. vertical leg, and a 5 in. hypotenuse.

You can double the values of each leg and it will still work: 6, 8, 10 and double it again: 12, 16, 20, etc. Just keep the 3,4,5 ratio.

[frank shic]

but ken, how is lee valley going to make any money off of us with that elementary concept? :D

thanks for sharing that video and all of your other instructional posts, nissim. it's a fantastic idea in measuring for squareness without using any complicated marked measurements. i can see the advantage of having an adjustable tool like that over fixed length squares.

[Phil Pritchard]

Another jig to make. Personally on joinery work I just use a tape measure and measure acrosas the diagonals........

[John Huber]

For getting the inside diagonals exactly right, a bar gauge is handy. It is quick and I can make adjustments before the glue sets up. I bought mine from Lee Valley. Our monetary relationship is ... I send it to them!

http://www.leevalley.com/wood/page.aspx?c=3&p=32585&cat=1,43513

[Rick Lizek]

Another jig to make. Personally on joinery work I just use a tape measure and measure acrosas the diagonals........
The tape measure is the choice of professionals. Keep it simple is best. I don't need anymore jigs to clutter up the shop.