Ok, you all already know that I am new to woodworking, so let me in on what exactly is the 3x4x5 method when squaring up plywood?
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Ok, you all already know that I am new to woodworking, so let me in on what exactly is the 3x4x5 method when squaring up plywood?
Measure up one side very accurately 3 inches or feet (the longer measure is more accurate) ,measure up the other side very accurately 4, then measure diagonally between the marks. If it measures 5 exactly, your piece is square (you are measuring the long side of a triangle).
Hope this is clear, it's too early for much geometry.
Eddie
This method uses the so-called Pythagoras c² = a² + b²Quote:
Originally Posted by aurelio alarcon
http://www.didmath.ewf.uni-erlangen....ges/beweis.gif
So if you have a rectangular piece of ply, one side is 3", the other is 4", the diagonal has to be 5".
Hope this helps,
Christian
You can also use the 2, 3 and 3.6055512754639892931192212674705 method, but for some reason it is not so popular.
Rob - that was funny!
Rob,
LMAO
6, 8, 10 and 5, 12, 13 are also usable options.
Thanks guys. I think I remember Norm doing this.
Hey Christian.....I didn't realize you were in Austria until this morning. :)Quote:
Originally Posted by Christian Aufreiter
I have been to Austria several year ago...been through Insbrook (spelling?).....really pretty place.
Hey Rob....I think you were off one digit..? :DQuote:
Originally Posted by Rob Glynn
Hi Dennis,Quote:
Originally Posted by Dennis Peacock
what did you do in Austria, did you visit it for a special reason?
As you mentioned Innsbruck ("Inn" is a river), did you stop at the Felder company?
You probably remember the "Goldene Dachl" (Golden Roof), Innsbruck's landmark.
I live in a small village located near Linz, Upperaustria.
Regards,
Christian
Jason mentioned some variations but you can double or halve the 3--4--5 measurements and they will all work. For example, 1-1/2--2--2-1/2 or 3/4--1--1-1/4 or going the other way 6--8--10 or 12--16--20 etc. These measurements can be acres, hectares, furlongs, rods, chains, yards, feet, inches, cubits, paint cans, coffee cups, any units of measure that you care to use as long as they stay the same. On larger scales your measurements can probably be off a smidge and you can get away with it like on floors or patios and such. For smaller areas, under 1.5--2--2.5 let's say, your measurements need to be getting more and more critical the smaller you go. I don't believe that I can see that small a difference, an accurate 1/16" is probably my limit, so I use a known good (perfect 90 degrees) square for anything the size of a framing square or smaller. Just my two cents. Hope it helps.
Mark --Quote:
Originally Posted by Mark Rios
You're pretty much right, except that the unit of measure needs to be a distance measurement. Furlongs, rods, chains, yards, feet, inches, and cubits work just fine. Acres and hectares do not. They are area measures.
Jamie
Nobody mentioned links. What about links? I hate it when people forget about links. Sheeezz.
:)
And since tomorrow is Sunday - what about cubits???
Todd, my Pocket REF lists 12 different cubits - this could get messy!
Cheers, Larry
Quote:
Originally Posted by Todd Burch