Reply by jgt1942

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Posted on Strait-Line X3 Professional Laser Level - what am I doing wrong

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203 posts in 2094 days

#1 posted 07-13-2016 09:48 PM

OK the test has been completed and the X3 laser is off.
I have some 8’ cabinets, at the top I made a mark, using the 6’ level I drew a line from the top of the cabinet to the bottom (obviously I had to move the 6’ level).

Very near the top of the line I drilled and inserted a screw. From the screw I hung my plum bob. This is the plum bob used by a master construction pipe fitter. The plum bob did not touch the cabinet, the string end of the plum bob has a loop thus the string line will hang exactly in the center. BTW the string is actually very light fishing line. After the plum bob stopped moving I checked with a machinist square and noted that the plum bob was dead on. Thus the level is accurate assuming it is used correctly. :)

I then used a 1” brad nail to mount the X3 near the top of the line. The brad nail was driven directly into the line. I then turned on the X3 and leveled it per the level in the X3. Then I moved to the bottom of the cabinet and noted that the light was off the line almost 1/4” (5-6 mm).

Thus if I expect to use the level in the X3 I need to adjust it internally. Currently I don’t know if this is possible and there is the possibility that I will make it worse. I could just not use the level in the X3 and just rely on the laser, e.g. ensure it is on the line for the first 1-2’ and hope that I got it close enough and then the other end should be on the line. However this is not the way it was intended to be used. I “should” be able to make a mark on a vertical wall, level the X3 and the light on the other end should be right on the mark, not 1/4” off.

Another option is use the plum bob but sometimes this is either too difficult or due to the irregularities of the wall or if it juts out on one end or other reasons the laser is the better option. Most likely I will be using it for something less than 30’ thus at 30’ I might be off as much as 1” (I did not do the math).

As I see it I’m left with two options.
1) Try and align the X3
2) Throw away the X3 and get an accurate unit.

-- JohnT

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