ENCLOSURE AS 2160664 - Caterpillar

1 Select three test trunks with different diameters every day. The test trunks must correspond to the various species in the actual felling operation. The trunks may not be oval (maximum oval shape is 1 cm on a 20 cm diameter) and must be free from branches and knot protuberances.2 Process the first trunk, placing the logs after each other so that it is easy to see the relative sequence of the logs.3 Print a cutting list for the trunk by pressing 8.4 Measure the different log lengths using a precision inspected measuring tape. Cross-calliper the top diameters (measure from the thinnest point 10 cm in on the trunk, and remember that the computer only records descending diameters). Make a note of the mean value of the callipering.5 Compare the measured values to the values for length (Lgd) and for diameter over bark (DiamOB) on the cutting list. Make a note of species and whether the values are similar or if there are differences (difference = measured value minus cutting list value).6 Repeat items 2 - 5 for the other two trunks.7 Make copies of the two diagrams in appendix 1. Enter the values following the examples on the next page: * Follow the zero line until you reach the displayed value.* Enter the difference on the diagram. If the values are the same, make a cross on the zero line.Plotting the deviations on the length diagram
Exemple 1:Measured value: 399 cmValue on cutting list: 402 cmDifference: 399 - 402 = - 3 cm Exemple 2:Measured value: 374 cmValue on cutting list: 372 cmDifference: 374 - 372 = +2cm When the diagrams contain enough values (at least 50) to compile reliable statistics, an evaluation and possibly a calibration must take place.Interpreting the length diagram
Draw a straight line from the zero point, so that an approximate average of the plotted values is formed. Find a calibration length that intersects a centimetre line.In the example below for instance, select "calibration length" = 520 cm and "measured length" = 522 cm. Plotting deviations on the diameter diagram
When you cross-calliper top diameters for inspection of diameter measuring, remember that the computer only records descending diameter values. It is therefore necessary to find the smallest diameter on the log up to 10 cm from the top cut. Interpreting the diameter diagram
Draw a curve, so that it forms an average of the plotted values. Use curve. Take the deviation value for each calibration diameter where the drawn curve intersects the line for a calibration diameter and insert these values in a table.The table to the right serves as a basis for calibration.Use the calculated "calibration value" as the "measured value" when calibrating. N.B. If the deviations are very large and vary between large plus and minus values, this may indicate faulty diameter measuring equipment.When using a data calliper:
The diameter and length sensors are carefully calibrated when the harvester head is put into operation. To retain the same accurate display during the lifetime of the harvester