J. Installation Procedures – 2nd Boom Calibration

• Due to the mathematical constraints of the automatic calibration procedure, calibrating a 2nd boom machine sometimes MAY  lead to strange inaccuracies of the calculated element lengths. The purpose of the following calibration procedures is to provide recommendations and a dedicated procedure on how to avoid these errors.
• The main differences of calibrating a 2nd boom machine rather than a single boom are the following:
• 10/20 laser pointer shots are required instead of the standard 6/12 laser pointer shots.
• It is necessary to SIGNIFICANTLY change the angles between the main boom and the 2nd boom after EACH laser pointer shot.
• It is important to gain significant angle variances of ALL elements during the 10/20 laser pointer shots.
• The main challenge is to find a procedure which leads to these significant angle variances of all elements, especially the main boom and 2nd boom, which may – depending on the procedure – only run through angle variances of 10-20°, which usually isn’t sufficient for proper calibration results and accuracies.

 

1. In the case of LARGE 2nd boom machines with 2nd boom lengths of 3.65 – 5.49m, a free setup of the laser pointer using the magnetic mount rather than the two poles (or an elevating tripod) is recommended. Generally speaking, the larger the laser pointer low/high height difference, the more accurate the calibration results will be.
2. Remove the bucket prior to machine calibration.
3. Lower the machine’s dozer blade, if it has one, to stabilize the chassis.
4. In the lower laser pointer position, prior to the first (1) shot, fully fold in the 2nd boom and fully reach out with the dipper stick:

 

 

5. Prior to the second (2) shot, unfold the 2nd boom approximately 25% of the cylinders length and pull in the dipper stick approximately 10%. Lower the main boom to catch the laser dot:

 

 

6. Continue progressively up to shot five (5) unfolding the 2nd boom approximately 25% of the cylinder’s length each time to reach the fully extended orientation. Pull in the dipper stick approximately 10% each time to arrive at an approximately vertical position. Lower the main boom to catch the laser dot:

 

7. Prior to shot six (6), fold in the 2nd boom approximately 25% of the cylinder’s length. Pull in the dipper stick approximately 10%. Lower the main boom to catch the laser dot:

 

8. Continue progressively up to shot ten (10), folding in the 2nd boom approximately 25% of the cylinder’s length each time to reach a fully folded orientation. Pull in the dipper stick approximately 10% each time to arrive almost horizontal. Lower the main boom to catch the laser dot:

 

 

9. Repeat the procedure in the high laser pointer level. You may have to open the 2nd boom slightly to achieve the laser catch, depending on the machine’s geometry:

 

10. Continue progressively up to shot ten (10), folding the 2nd boom approximately 25% of the cylinder’s length each time  to reach a fully folded orientation. Pull in the dipper stick approximately 10% each time to arrive almost horizontal. Lower the main boom each time to catch the laser dot:

 

Due to the significant angle variances of ALL elements (main boom, 2nd boom, dipper stick), AND  the significant angle changes between the 2nd boom & main boom, you will consequently gain MUCH BETTER  results. The comparison of calculated to measured element lengths will be almost spot-on.