Help me don't understand how to see if the beam is aligned using string! picture

[gasto]

go crazy how can you know with the help of the string if it's straight?

 

[gasto]

image 2

 

[Kjell_G]

Try to place the string outside the rule. The width of a folding rule usually works well, so you can use it to test at different points along the length of the rule.

 

[jtl]

Straight in relation to what?
Parallel to the wall, 90 degrees against the other string rule?

 

[gasto]

I still don't understand, surely if the rule is bent in the middle, you can tell if there's more than a folding rule's length between them.. I mean straight from the wall out to the rule.. the rule will always be straight at the ends when you place a folding rule between.. it's if it's bent in the middle that you see. I want a straight line from the wall out to the rule.. I'm going to put up a fence... so it isn't crooked from the wall.. the only way is a laser level, right?

 

[palman87]

Look up the Pythagorean theorem or whatever it's called. Then you can measure it out.

 

[JOW]

Oh, you meant perpendicular from the wall and perpendicular from fence to fence...
One side 60cm, the other 80cm, the hypotenuse, i.e., the long side of a right-angled triangle, then becomes 100cm.

Otherwise, you can take longer measurements and calculate. a^2 = b^2 + c^2 or, hypotenuse = square root(b^2 + c^2)

 

[Kjell_G]

Ok, now I'm with you. Pythagorean theorem gives you a right angle. A classic measure is the legs 3m and 4m. Then the hypotenuse becomes 5m. 🎓
Hope your terrace has those measurements, otherwise use JOW's formula😃

 

[palman87]

Oops, a few spelling errors from me

 

[bax]

Carpenters usually measure the sides as 1.2m and 1.6m.
Then the diagonal should be 2m.

 

[JOW]

Yes, you have to adjust the measurements according to the size of what you're building

 

[Bricco]

I don't understand what the problem is that they want to solve

 

[gasto]

this is advanced honestly don't get anything.... how it can be so difficult when it's about angles
I mean I want it to be perfectly straight from the wall out to the stud straight out where I will have a fence.
because I don't think it's straight when you look at the line I've marked out...

 

[gasto]

I think that the line towards the wall should be moved a bit to the left to make it perfectly straight... but I can't figure out how to measure to achieve that... in picture 2, that is.

 

[Wisentdual]

Measure 3 m out on the string and 4 m on the wall. Adjust the end of the string sideways until it is 5 m between those points.

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