Laser level: How to leveling w / crossed line laser level?

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Obamot
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by Obamot » 16/04/12, 16:28

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Required equipment:
- a laser bubble-level.
- a reference metallic bubble-level (or precision one).
- a stable photographic tripod in aluminum if possible.
- a plumb-bob.
- 3M masking tape, for the fixed measures on a wall or others targets.
- some permanent pen, to marking and dating the final measured level (when leveling and writing directly on the wall).
(And of course, it's easier with an assistant and binoculars can help too).
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by Obamot » 16/04/12, 16:58

How to adjust your "laser bubble-level", step by step

1) If you dont have one, borrow few minute a "reference bubble level" (also known as a "spirit level"). With a precision of 0.5 mm / m (such as the "laser bubble-level") or better - 0.2 mm / m if possible - because the "reference" must be a tad better than what you would like to adjust:

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2) As above: choose a floor that is absolutely flat and leveled properly, like a marble floor or something (such as in the department stores, for example ...).

3) You can check if it's really flat, by doing the first measure with your "reference bubble-level", to get the bubble stick exactly in the middle between the two benchmarks. For examples:

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- then turn your "reference bubble level" by 180 ° ... exactly in the SAME location:

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- if the bubble continues to stay in the middle, such as here:

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... you can be sure, that the floor is flat.

If not, you must change the place until you find a new place in the SAME location: again try it, upside down by 90 °, 180 ° (or whatever ... everything you can try ...).

(Caution: keep in mind that a "reference bubble-level" can be wrong also! Because of a temperature differences or something ... Reason why it's necessary to check it also!)

So be carefull, and if you think something go wrong, do not hesitate to change it.

4) When you already find the right place that show the bubble in the middle (two times) with your "reference bubble level", you are ready to check your "laser bubble-level". You can just put it on the floor (don't use a tripod to adjust) closer to your "reference bubble-level" (exactly in the same place):

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... so, you are ready to check the "laser bubble-level" (by the same way) by comparing with your "reference bubble-level":

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5) Then turn your "laser bubble-level" by 180 ° (but not the "reference bubble-level"):

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6) If the bubble stay AGAIN, exactly in the middle you win! Your level is leveling: well done!

7) If not like here (and before turning 180 ° again):

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... you must adjust your "laser bubble-level":

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... by using one of theses:

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8} To adjust, you must doing that on the floor, in the same place of your "reference bubble-level": to compare of course ...:

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9) Turning the screw a tad (one of them)

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... Then, you must turn again by 180 °, to check it again TWO TIMES. Until you are 100% sure about your laser equipment. But it's easy, because it has two bubble units, and both must be in the middle when checking.

It's possible that you notice a short difference from the step #4 (above) then you need to adjust the level of the first try. This is sometimes because of the temperature difference etc ... For this reason, you must check your laser bubble-level every time before using it. And sometimes it dosen't match from the first. But sometimes yes: this is normal for a picky equipment!

For training: Here a video:
http://www.youtube.com/watch?v=JDrZLEyGFL8

... that suggest another similar way to do. But unfortunately, by this method you CAN NOT turn all to 180 ° ... So I prefer the method above to be sure. But that can give you some idea about this.
But as reported by this movie, it's a very good idea to have a second bubble-level (in the field)

So go onsite, in the field for leveling your house!

10) Try to find a tripod for photography. Your "laser bubble-level" is adapted to be screwed on it (same standard diameter of the screw).

11) Then you must use the "bubble level" for targeting your house, but first of all:
- you need to adjust the horizontal "laser Bubble-level ", by using the horizontal bubble (as reported on the video above).
- then you must "plumb" by the same way, but using the vertical bubble:

Image

Take a look to this video, to know how to "plumb", by another explanation:
http://www.youtube.com/watch?v=s1uG9Ds18tQ

So, you can use the vertical bubble AND / OR a vertical reference line that can help, for example: targeting some antenna behind your house or better: use a plumb bob:

Image

... and compare the vertical laser line with the string attached to the plumb (but you must be sure that your line is not biased, of course).
Then, after that, you can turn to 360 °, and it must be the same level and perfect allignment with the vertical line (and the horizontal bubble, must be centered on the time, of course).

Now it's up to the house!

In the case of this thread, I also recommend that the owners of the house leveling the inside, using the walk that turn around the house.
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by Obamot » 17/04/12, 00:51

Here a last video of a "laser bubble-level" very interesting, because it is pretty similar of the PowerFix, and show many applications for to use it, and how you can use (but the Powerfix is ​​easier to use, because of his two laser LEDs that provide crossed lines)

http://www.youtube.com/watch?v=wTFTBeUo ... el&list=UL

What is also interesting with a "laser bubble-level", when using in the night or by sunset, it can extend the range of usable distance.
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by Capt_Maloche » 17/04/12, 21:24

Nice your subject

and it does not look like this level level indeed

It is found on the net?
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by Obamot » 17/04/12, 22:14

Yes but only sent to Germany. Otherwise they put on sale regularly, but must wait! As usual in this kind of stores.
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by Obamot » 02/05/12, 01:54

There may still be some. I'll know that tomorrow.
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by antoinet111 » 02/05/12, 14:08

I have a laser level cross pendulum, I find it top, no adjustment, no spirit level. just to ask and roll.

full automatic
that without the bubble levels that are useless.
http://www.comptoirduweb.fr/F_frame.htm ... t_222.html
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by dedeleco » 02/05/12, 14:19

And in addition to 30 € !!

Remarkable !!

precision ?????

may be too imprecise which would explain the broomstick !!!

if not a nice collection of lasers much more expensive 50 times:
http://www.debonix.fr/mesures-controles ... ntier.html

with the specified precision 116 €:
http://www.bricoman.fr/m019/niveau-lase ... table.html
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by Obamot » 02/05/12, 14:43

With 30 €? you got 3 ...

10 € at Lidl. Precision: 0.5mm per m ... What else? Be careful, it does not replace a reference level like the one in the photos above. They have them regularly, but you need a little patience ...

AntoineT ... a self-adjusting teuh! I would not even if you offered me, I prefer to adjust myself to the old ... If, yes, the bubbles are used for something: the visual control, there at least it's you control the situation! Besides the level of your link has four, look good! It is said that he has a "formidable accuracy", well we would have liked any figures! : Mrgreen:


It is precisely because it is not self-adjusting that I find it well. Because this reference, it never changes : Lol: :

Image

It is worth the best professionals amah (since in general they have lots of gadgets and more but not so obvious facilities, together in one device). Honestly, I do not know who has it all, and at any price ...:

- robust aluminum presentation (like "the big ones" ...);
- easy to carry (not like some "big"!);
- design of a traditional spirit level (which allows to do effective shots, and not these all-in-plastoc laser cuddles, without recoils and markers on the body of the device - like some "big". ..);
- dimension of the laser axis drawn on the device (+ centimeter scale on one side as some "big" ...);
- double LED laser cross! (Like some "big" ...);
- magnetic base very practical according to the works (as some "big" ...);
- threaded rod to place it on a tripod photo (so no problem in 360 ° as "the big" ...);
- accuracy of 0,5 mm / m! (Like "the big ones" ...);
- and of course, double spirit level (horizontal / vertical) with backlight! (Like some "big" ...);
- and the advantage of having a double crossed line perpendicularly is that one can help a plumb line to adjust it vertically, for an absolutely perfect alignment without trouble! (Like some "big" ...);
- Normally it is not adjustable, but I found the way to do it stupidly using the fixing screws! (Like some "big" ...);
- Adjustment of horizontal and vertical levels, de facto manual, and not these automatic leveling cuddles, where you never know where you are ... (Like some "big" ...).
- except the laser, no useless electronic gadget, futile and puzzles that are sources of failure (as on some big ...).
- guarantees 3 years (rare among the "big" ...)!

There is just the range a little weak, but as there is a backlight, it can pafraitement use outside at dusk, but for the price ...
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by dedeleco » 08/05/12, 21:41

Obamot wrote:

Image

The laser is not necessary to see that the house goes down in the muddy rice field, and the main thing is to stop the evolution before gradually recovering.

A detailed presentation on soil improvement:

http://www.cours-genie-civil.com/IMG/pd ... s_sols.pdf

In-depth cement injection is simple if low pressure and could solve the problem.

Have they tested the soil with a pile or single tube of several meters, and a mass of 5 10 Kg tapping on it by hand, to know the depth where this tube sinks without difficulty, equal to the depth of soft ground ????

Is this peat, all soft ???
Very possible if for millennia, water stays and accumulates vegetable waste in humus, very good for rice; but ideal to swallow a house.
It's simple and crucial !!

In my opinion it is urgent to know and act before the next floods.

The mechanical characteristics of the soil depend on the concentration of the different
phases. So after treatment so-called grenched soils have a better mechanical behavior, the
orders of magnitude are often encountered:
• peat 0,2 to 0,5 MPa;
• soft clay (recent) 1 to 5 MPa;
• steep clay 10 to 50 MPa;
• loose sand 5 to 20 MPa;
• 100 dense sand at 200 MPa
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