Creating a Flat Plane - 3 Point Buck-In Using 3 Targets

This procedure is useful when working alone on a large surface (reduces the amount of time going back and forth from each target point).

The procedure requires three A-517 targets, three readouts, and a laser.

All of the targets should checked for calibration to the readouts before performing this procedure.

1. Set up the laser so that the entire surface can be scanned and pick out a point that will act as what we call the master foot print, this is usually the near target position, but does not have to be.
2. Zero all three targets at this point.
3. Place two of the targets at the two other target positions.
4. Tilt the laser into the furthest apart targets, making the readouts read the same number same sign.
5. Now tilt the laser into the opposite axis by observing one of the far readouts and the short axis readout.
6. When all three readouts read the same number same sign, the laser plane is parallel to all three points.
7. To check the buck-in: re zero the targets at the master footprint and move the targets back to there positions. Now observe the readings of all three targets and make necessary adjustments, if any.

1. Zero all three targets at the Master Foot Print.
2. Move targets to positions #1, 2, and 3.
3. Tilt the laser so that the #1 and #2 readout are the same number, same sign.
4. Tilt the laser so that the #1 or #2 and #3 readout are the same.
5. Tilt the laser so that all three readouts are the same number and same sign.
6. Re-zero all three targets at the Master Foot Print.
7. Re-set all three targets at there positions.
8. Make any adjustments necessary by tilting the appropiate axis on the laser