Pythagoras theorem

[charlie1]

Ok, how would you actually apply this method in a tiling situation? I've never really had to because the largest floors I do are 50-100 m2 so just use my folding square. The reason I ask is because I was working with another tiler recently and he was giving it the big 3-4-5 rule so I asked him to show me, I quickly realised yes, he was well aware of the theory like myself but he had no idea how to put this in to practise.

 

[Qwerty]

Never had to use it myself but have seen it done

 

[TJ Smiler]

I never got the hang of this mate, i tried it twice but both times i didn't feel like it was accurate enough (or wasn't confident i done it accurately enough), also i was unsure what to do with the straight line once i got it. I get the idea behind it but don't seem to be able to apply it.......

Looking forward to those in know filling us in.... Good question mate

 

[High Peak Tiling]

I don't see how you would apply this to tiling either ..

http://www.youtube.com/watch?v=AA6RfgP-AHU

 

[Peter]

Pythagoras is for finding the length of the third side of a triangle, not sure where this would come into play in normal tiling. A 3 4 5 is as straight forward and accurate as you'd need for just checking two chalk lines are square to each other.

 

[John Benton]

Or on larger floors use 3m 4m and 5m exactly same principle to find if the angle is exactly 90 degrees!!

 

[One Day]

I use 3 4 5 (or multiples of) for a quick mental image of squareness before setting out.
It's not really Pythagoras' theorem but just a snippet of it.

 

[Diamond Pool Finishers]

I use 3-4-5 for setting out my corners of the swimming pool copings, :8:

 

[The Legend; Phil Hobson RIP]

3-4-5 has been a part of tiling forever, the square of the hypotenuse is equal to the sum of the squares of the other two sides.

 

[MTiler]

Ive used it a few times on floors to get the right angle, I was taught it on the tiling course I did

 

[Time's Ran Out]

3x3 + 4x4 = 5x5
9 +16 = 25

The sum of the squares forming a right angle of a triangle are equal to the square on the 3rd side .

Using this in tiling is a basic requirement to get a 90 degree angle.
If you take 2 points on a line 4 feet apart, draw an arc 3 feet long above and from the left point, draw an arc 5 feet long from the right point and where they cross is the point that forms the right angle between the 4 & 3 feet lines - a right angled triangle 345.
You'd need a very large folding square to be as accurate on large jobs.
The other geometry that should be understood is how to bisect a line. Once you have your lines straight you can move them parallel to suit your set out.

 

[Houston]

we would always check are setting out on floors to make sure they were square with 3-4-5 and you can always multiply 3-4-5 by 2 on bigger floors to give you that bigger square line.

 

[charlie1]

3x3 + 4x4 = 5x5
9 +16 = 25

The sum of the squares forming a right angle of a triangle are equal to the square on the 3rd side .

Using this in tiling is a basic requirement to get a 90 degree angle.
If you take 2 points on a line 4 feet apart, draw an arc 3 feet long above and from the left point, draw an arc 5 feet long from the right point and where they cross is the point that forms the right angle between the 4 & 3 feet lines - a right angled triangle 345.
You'd need a very large folding square to be as accurate on large jobs.
The other geometry that should be understood is how to bisect a line. Once you have your lines straight you can move them parallel to suit your set out.

Thanks for that, finally understand. (Arcs) so you could use string anchored at one of the points and a pencil?

 

[charlie1]

This guy I'm talking about fluffed about with a tape measure saying 3-4-5 but I could tell he had no method and was very in accurate.

 

[jamespaul]

on large floors I always get the site engineer or borrow his theodolite (dumpy )
you really need that accuracy or you,ll soon be in the ****

 

[Diamond Pool Finishers]

http://en.wikipedia.org/wiki/Pythagorean_theorem .

http://www.wikihow.com/Use-the-3-4-5-Rule-to-Build-Square-Corners

 

[radim]

I use it to find if walls are square for floor tiling. very accurate method.IMO

 

[charlie1]

I've never doubted it as the purest square you will find, just didn't know how to actually build it... Until now that is.

 

[The Legend; Phil Hobson RIP]

3x3 + 4x4 = 5x5
9 +16 = 25

The sum of the squares forming a right angle of a triangle are equal to the square on the 3rd side .

Using this in tiling is a basic requirement to get a 90 degree angle.
If you take 2 points on a line 4 feet apart, draw an arc 3 feet long above and from the left point, draw an arc 5 feet long from the right point and where they cross is the point that forms the right angle between the 4 & 3 feet lines - a right angled triangle 345.
You'd need a very large folding square to be as accurate on large jobs.
The other geometry that should be understood is how to bisect a line. Once you have your lines straight you can move them parallel to suit your set out.

John once more you put things better than I do.:lol:

 

[Dougs Third Go]

long corridors I'll use Pythagoras, but instead of 3,4,5 I'll use 5,12, 13,,same principle.

 

[Time's Ran Out]

5x5 + 12x12 = 13x13
25+ 144 = 169

The sum of the squares etc.

 

[charlie1]

5x5 + 12x12 = 13x13
25+ 144 = 169

The sum of the squares etc.

John, how would you do the arcs ? I'm thinking , ping a chalk line then measure 4, then do the arcs using a string and pencil or drill hole through tape measure and anchor it?.... Hope you follow my description

 

[charlie1]

John once more you put things better than I do.:lol:

Phil, I know this stuff is second nature to a few of you on here, I'm just trying to figure out the exact way you would put it in to practice, I understand now using arcs.

 

[TJ Smiler]

I'm sorry but i am still slightly confused. Maths is not my strong point! I can see the principle but not sure when to use it. Would you start with pinging a chalk line in the point of the room where you normally would then measure off this at the point where you need the tiles to lead into another room (for example). I would really love to get this mastered and i'm nearly there, i think :sofahide:

Thanks all

 

[The Legend; Phil Hobson RIP]

Phil, I know this stuff is second nature to a few of you on here, I'm just trying to figure out the exact way you would put it in to practice, I understand now using arcs.

Mark if you are trying to get a 90 degree angle having found a centre line, then measure 3 ft/ 3m or 3 anything, you then measure 4 ft/4m along that line when you get 5ft/5m to intersect that is 90 degrees. Not the best explanation, but it is all I can do.