Using 1-Arc-Second Levels

To level a surface, the laser is first put on an instrument stand or stable mounting surface and leveled in two axes, using the 1 arc-second, built-in level vials. Next, a single-axis target (A-1531/1532/1533 or A-1519/1519HR/1520) is placed on 1 reference point and zeroed out by pressing a button on the target or readout (electronically enters an offset to zero the display).

The target is then moved to a measurement point on the surface and the display shows the deviation of that point from the reference point. If the display shows a "+" that means the measurement point is higher than the reference point, and conversely, if it displays a "-" then it means the point is low relative to the reference point.

If the measurement point happens to have an adjustment pad under it, it can then be adjusted, using the target and readout as a live digital indicator, until the display shows zero. The measurement point is then in the same level plane as the reference point.

The levels can be calibrated in the field using an easy 15-minute procedure and usually hold calibration for several months.

Measuring Flatness with Reference Points Instead of Level

To use reference points instead of levels, the laser is mounted as described above. Next, three reference points are chosen on the surface. If using 3 targets, then each target is zeroed on the same reference point. Then 2 of the targets are moved to the 2 remaining reference points. The laser is then "bucked in" (or made parallel) to these points. Finally, the targets are moved to other points on the surface and deviations from the reference points are measured and displayed on the readout.

Using Plane5 Flatness Software

Our Plane 5 software can be used with the L-730/L-740 to quickly download flatness data for analysis and reporting. In fact, if the user is simply taking data, Plane5 employs a least-squares, best-fit algorithm to eliminate any slope errors from the data. What this means is that you do not have to buck the laser into reference points to check the flatness. This saves about 10 minutes of setup time.

A word of caution: If the machine is going to be aligned, rather than just measured, then it is important to put the laser on an instrument stand. If the laser is on the same machine bed or table that is to be aligned, adjusting it will most likely move the laser and thus affect the setup.