DW079 CALIBRATION SELF LEVELING ROTARY LASER. LOOKING FOR THE CAL ROUTINE (BUTTON SEQUENCE) TO ADJUST THE X & Y AXIS TO LEVEL.

Manuals Lib has the manual for the Bosch GRL160DHV dual-axis self-leveling rotary level here: https://www.manualslib.com/manual/411677/Bosch-Grl160dhv-Dual-Axis-Self-Leveling-Rotary-Laser.html#product-GRL160DHV%20-%20Dual-Axis%20Self-Leveling%20Rotary%20Laser . Click on the Download button (near the top left of the page) and solve the Captcha to get the manual as a PDF.

I hope this helps.

Cindy Wells

Hi, all electronic rotary laser levelers have an electronic calibration that you can do yourself, you just need to know the correct algorithm to control the buttons. Look here (https://laslev.com/reviews-laser-levels/firecore/automatic-rotary-laser-level-firecore-fre207r-servo/) for an example of this unit, it describes the entire calibration algorithm for the X-axis and the Y-axis. The buttons may be slightly different, but the principle is the same, I'm sure you can do it, there's nothing complicated there.

ck to see that piviot bearing does not have and dust or junk in it and moves very easy , i use mine for drywall and i have to clean out piviot all the time to get proper level from it

There are 2 leveling systems in the lasermark lasers. The original was belt driven. The belts are rubber O rings, and break down over time. take the bottom off the laser and you can replace broken belts. It's a simply yet elegant system.
The newer ones use leveling cams. A tear drop shaped wheel on a motor, that raises and lowers one end of an axis to tilt the laser. The problem is because they have a hook at one end, they put a magnet in the cam to tell the laser when to stop turning the cam. If however, it reaches the limit, and then gets bumped it'll get the leveling axis stuck in the hook of the cam, and because the magnet is there, it will never relevel. What you have to do is, disassemble the laser, unplug the leveling motors and pull the wires for the magnet sensor out of the stuck axis. then swap the sensor from the other sensor in (as it wont level without reading the sensor) and then turn the unit on. It should be able to level at that point. The put all the wires back where they go, and you're on your way.

Check for green corrosion on contacts and clean them A dab of WD40 on a Q tip will may help clean & improve the connection and provide extended protection.

Your vial and compensator no longer match up. Move the foot screws until you can get your laser to spin, then adjust your leveling vial until it reads level again, using the 3 screws holding the vial inplace.

Your compensator and leveling vial are no longer aligned. Use your foot screws to find a place where the laser spins, then use the 3 hex head screws on the vial, to adjust it to read level.

You can not calibrate the Laser in the field it needs to be sent to a dewalt service center however you can check the calibration to see if it is off

download the manual here with instructions on how to check it

Hold down the ( V ) button while powering the unit on. THe puts the unit in cal mode for the Y axis. Hold down the up button while powering on the unit, this puts it in cal mode for the X axis. that is as far as I have gotten.

Paul

Sounds like you figured this out on your own. I calibrate my own DW073 regularly without any fancy gadgets. I use the calibration check procedure in which the unit is placed about midway between fixed objects 100' apart.

These have a front and back and sides, so first you mark where the laser hits facing front to back at your targets. Then turn it 180 deg. relevel and resite. If the difference between the new and old marks is not the same then I turn the adjuster to halve the inconsistency and once that is accomplished, tweek the adjusting screw at the end of the level vial. (Because if you have adjusted more than the tiniest bit, the bubble will no longer display as level. So having established level, or closer to it, the adjustment here is actually to bring the relevant bubble vial back to level rather than assume they are level and adjust the physical beam mechanism (unlike the old physical sight levels where you adjusted the actual optics -- a little more like adjusting a rifle scope). Then you repeat for the side to side vial.

Anyway sounds like you are set so I posted this for anyone who happens to find this thread and is looking to field calibrate their DW073, e.g. don't have time or money to get it done in some shop.

I also wanted to post an add on question. Did you figure out how to adjust the "cone error", i.e. the accuracy of alignment of the twin lasers. They appear to have allen set screws that lock their adjustment, and maybe they are then reaimed by using a slotted screwdriver on the brass ring surrounding the laser. Maybe these are made eccentrically or slightly beveled so turning the laser reaims.

So far, my cone has stayed within the specs of 3/32" at 25' in the manual. But I'm seeing two lines at maybe 150' out. Probably that is close enough for gvmt. work, and I may find the adjusment so sensitive that I can't really get it any closer. But I'd at least be interested to know the method for adjusting the cone error.

Thanks,

Brian