Pythagoras theorem

[prceramics]

always do a 3-4-5 to double check chalk lines

 

[charlie1]

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.

Thanks phil, I do understand, the only slightly cloudy bit now is how you would draw the arcs?, I'm thinking a tape measure with 2 small holes drilled 4 and 5 feet apart, one for anchoring with a small nail then the other for putting your pencil through.... Maybe I'm over engineering this lol

 

[Time's Ran Out]

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

It's obviously easier if there are 2 of you but a tape, string or staff with a masonry nail on the points works for me!

 

[Diggy]

I use 3 4 5 everytime on big floors, old habits die hard.

Diggy

 

[Gazzer]

It's obviously easier if there are 2 of you but a tape, string or staff with a masonry nail on the points works for me!

I used to use the staff with masonary nails method for many years. I still would on larger floors.

 

[Diggy]

CHARLIE, have a look for Beam compass or Trammel heads.

Diggy

 

[gamma38]

Why not just use a laser?? or am i missing something??

 

[Qwerty]

Why not just use a laser?? or am i missing something??

I always thought the same, but seen others check using the 345. I should start doing it really....especially when I'm in a conservatory in the middle of summer struggling to see my laser lines!!!

 

[Old Mod]

Why not just use a laser?? or am i missing something??

its more accurate, especially over larger areas and doesn't need batteries! But lasers are quicker haha
Wow, just seen this thread. I truly thought this was tiling 101! It was one of the first things I was taught!

 

[charlie1]

The only reason I've never used 345 is because I had no idea how to actually pit it in to practice, every time I thought about it I just saw too much room for error, then I seen this guy doing fluffing about with a tape ... Now I see, staffs , pins and arcs... The perfect square and very easy. Yes, you could just use a laser but that's another piece of equipment you might not have. I'd trust a chalk line over a laser anyway, how accurate is a laser over 5 meters?

 

[gamma38]

I have the bosch gtl3. I can't remember how accurate it is over a certain distance. It does me fine for most situations i need nowadays. If not i use chalk lines on bigger floors. Never really used the 345 for a long time.

 

[Ajax123]

Once upon a time in an Indian village, there lived three squaws. Two squaws had young sons who were very overweight. The first squaw, whose son weighed 150 pounds, always placed her son on a bear hide near a pine grove; the second squaw, whose son also weighed 150 pounds, put her son on a moose hide in the shade of a large oak tree; but the third squaw, who was expecting the birth of her first son, always rested on a hippopotamus hide beside a bubbling brook. Her weight? 300 pounds! To this day, mathematicians give credit to these women and their children for proving the Pythagorean Theorem, because you see: The squaw of the hippopotamus is equal to the sons of the squaws of the other two hides.

 

[Diggy]

I believe bosch is +/- 0.2mm/Lm, same as the laser level

 

[gamma38]

I believe bosch is +/- 0.2mm/Lm, same as the laser level

Near enough for this old fart.

 

[Gazzer]

The laser square is great but can suffer in bright sunlight. I then to only use mine to set out with anyway. Then marks are placed on the floor and the chalk line comes into play.

 

[The Legend; Phil Hobson RIP]

Once upon a time in an Indian village, there lived three squaws. Two squaws had young sons who were very overweight. The first squaw, whose son weighed 150 pounds, always placed her son on a bear hide near a pine grove; the second squaw, whose son also weighed 150 pounds, put her son on a moose hide in the shade of a large oak tree; but the third squaw, who was expecting the birth of her first son, always rested on a hippopotamus hide beside a bubbling brook. Her weight? 300 pounds! To this day, mathematicians give credit to these women and their children for proving the Pythagorean Theorem, because you see: The squaw of the hippopotamus is equal to the sons of the squaws of the other two hides.

I was tempted to put that one on Alan.:lol:

 

[Dougs Third Go]

Pythagoras never needs re-calibrating and is +/- 0mm to infinity and beyond :lol:

 

[John Benton]

Pythagoras never needs re-calibrating and is +/- 0mm to infinity and beyond :lol:

And doesn't require batteries!!!

 

[Diggy]

Excuse my ignorance and i know its the wrong thread, but how do i 'like' on taptalk now? It seems ti have changed?

 

[Gazzer]

Excuse my ignorance and i know its the wrong thread, but how do i 'like' on taptalk now? It seems ti have changed?

Forum was upgraded a few days ago and likes and thanks are not working with Tapatalk. I did start a thread on the subject.

 

[charlie1]

Im finishing off a bathroom tomorrow 3m2 floor.... I'm gonna build myself a pythagorator with some wood and nails!!

 

[The D]

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 sid.

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.

i would say that is the post of the year

 

[Time's Ran Out]

i would say that is the post of the year

I kept that one for my 8000th post but like the 7000th it slipped under the radar!

 

[The D]

bloody chatterbox arent you

 

[TJ Smiler]

I have a small bathroom floor tomorrow afternoon and am gonna give it another go, some great stuff on this thread so cheers lads/lasses