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Thread: Why Starret?

  1. #31
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    If I remember correctly, a triangle with sides 3 : 4 : 5 should give a "perfect" square. All to do with this truly ancient codger Pythagoras.
    The challenge remains the accurate measuring of 3 4 & 5 in the first place, which now brings us to the accuracy of the measuring tools used!!!!

    And on we go....

    Yvan

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  3. #32
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    Quote Originally Posted by yvan View Post
    If I remember correctly, a triangle with sides 3 : 4 : 5 should give a "perfect" square
    Yes, except the other angles are not necessarily the most common found in woodwork (or anything else except trigonometry):
    "Because it is a right triangle one angle is obviously 90°. The other two are approximately 36.86° and 53.13°."
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    Quote Originally Posted by Luke Maddux View Post
    ...Can someone elaborate on this method of scribing two lines to test for square? Do you just put the square on a jointed edge, scribe a line, then turn it over so that the reference edge is facing the other direction and scribe another line from the same starting point and then see whether or not there is any divergence in the two lines?
    Yep, Luke, as FF says, that's it. I usually only scribe a single, thin line; when the edge of the square lies wholly within or along the scribe line when the square is flipped, you've got it pretty close. The obvious caveat is to be sure the edge you use to butt the stock against is as straight as it can be.

    The beauty of this method is that you see double the error because any divergence from a true 90* is mirrored. When you get to my age, you'll realise how necessary that can be.....

    Cheers,
    IW

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    Quote Originally Posted by FenceFurniture View Post
    Yes, except the other angles are not necessarily the most common found in woodwork (or anything else except trigonometry):
    "Because it is a right triangle one angle is obviously 90°. The other two are approximately 36.86° and 53.13°."
    No argument here, but aren't we just talking about how square is the right angle?

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    Quote Originally Posted by yvan View Post
    No argument here, but aren't we just talking about how square is the right angle?
    Yes indeed, but I'm just highlighting that if you are going to make one up then it'd be better to have other more useful angles on it. I'm only making a very minor point here, btw
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    Quote Originally Posted by yvan View Post
    If I remember correctly, a triangle with sides 3 : 4 : 5 should give a "perfect" square. All to do with this truly ancient codger Pythagoras.
    The challenge remains the accurate measuring of 3 4 & 5 in the first place, which now brings us to the accuracy of the measuring tools used!!!!

    And on we go....

    Yvan
    Actually, I think it was the Egyptians who figured out the 3:4:5 ratio, quite a while before young Pythagoras figured out that the squaw on the hipopotamus was equal to the sum of the squaws on the other two hides (or something like that!). At least he didn't go running down the street naked, yelling "Eureka" like that exhibitionist Archimedes......

    The things we remember from our school days, eh?
    IW

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    Quote Originally Posted by IanW View Post
    Actually, I think it was the Egyptians who figured out the 3:4:5 ratio, quite a while before young Pythagoras figured out that the squaw on the hipopotamus was equal to the sum of the squaws on the other two hides (or something like that!).
    That's only applicable to the regular Hippo, Hippopotamus amphibius. It's a different formula for the Pygmy.
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    Quote Originally Posted by FenceFurniture View Post
    ...The other two are approximately 36.86° and 53.13°...
    That's simply not good enough, Brett - you are missing a whole 0.01 of a degree there! If you were to follow a compass bearing with that degree of error, & set out to walk from your place to mine, you'd miss me by a couple of metres!
    IW

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    Quote Originally Posted by IanW View Post
    Actually, I think it was the Egyptians who figured out the 3:4:5 ratio, quite a while before young Pythagoras figured out that the squaw on the hipopotamus was equal to the sum of the squaws on the other two hides (or something like that!). At least he didn't go running down the street naked, yelling "Eureka" like that exhibitionist Archimedes......

    The things we remember from our school days, eh?
    Quite right....and we don't need goggles to do so

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    Quote Originally Posted by IanW View Post
    That's simply not good enough, Brett - you are missing a whole 0.01 of a degree there! If you were to follow a compass bearing with that degree of error, & set out to walk from your place to mine, you'd miss me by a couple of metres!
    Mate if you can sit still for the time it'd take me to walk there, then I promise I'll have a real good look for you on arrival.
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    Quote Originally Posted by FenceFurniture View Post
    Yep, see here:
    http://gifkins.com.au/shop/09-08-45-degree-square/

    Damned hard to find on the site eh Nick?

    Now if you want one that's engraved "CC" and not "GD" you'll have to go to Colen.
    In my defence I'd like to say I was rushing out the door ...

    well look at that - you can buy all separately
    regards
    Nick
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    Without wood it's just ...

  13. #42
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    My go to square is the Nobex - not El cheapo but does great work. Had it for many years and still going accurately.

    http://www.carbatec.com.au/nobex-multi-squares_c4620
    Regards,
    Bob

    Absence of evidence is not evidence of absence.

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    Another variation of Pythagorus Theorem is 5, 12, 13 where 5 and 12 are the two sides of a right angled triangle and 13 is the hypotenuse.

    Sometimes useful when you cannot use 3, 4, 5 or any multiples of them
    Tom

    "It's good enough" is low aim

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