Method and system for felling sawing using a forest machine
The invention relates to a method for felling sawing using a forest machine. In the method, a felling head is used, which set near to the tree to be felled. In addition, sawing is performed on the tree using a saw device fitted to the felling head. Before sawing, the saw device is set to a selected level relative to the ground surface, which is recorded in the data system belonging to the forest machine. The invention also relates to a system for felling sawing using a forest machine.
1. A method for felling sawing using a forest machine, in which method a felling head is used, which is set near to a tree to be felled, and sawing is performed on the tree using a saw device fitted to the felling head, wherein before sawing, the saw device is set to a selected level relative to a ground surface, which is recorded in a data system belonging to the forest machine.
2. The method according to claim 1 , wherein the level selected is a safe level in terms of sawing.
3. The method according to claim 1 , wherein after the recording of the level sawing is performed from a selected side of the tree.
4. The method according to claim 1 , wherein, before recording of the level, the saw device is lowered against the ground surface, or as low as it is possible to lower the felling head when set around the tree, before sawing.
5. The method according to claim 4 , wherein, on sloping ground the saw device is lowered against the ground surface, or as low as possible, on a side of the upper slope.
6. The method according to claim 1 , wherein the sawing is undercut sawing, counter-sawing, or felling sawing.
7. The method according to claim 1 , wherein the level is determined using one or more sensors, which is arranged in a set of booms belonging to the forest machine.
8. The method according to claim 7 , wherein one or more sensors are configured to determine a pivot angle of the set of booms and thus to determine the level of the saw device.
9. The method according to claim 1 , wherein the level is shown graphically on a display, which is arranged as part of the forest machine's data system.
10. The method according to claim 1 , wherein the felling head is positioned programmatically at the recorded level.
11. The method according to claim 1 , wherein using sensoring belonging to the forest machine the rotation angle of the felling head is determined at any time, on the basis of which the various saw cuts are aligned with other possible saw cuts.
12. The method according to claim 1 , wherein the saw cuts are aligned programmatically with other possible saw cuts.
13. A system for felling sawing using a forest machine, which forest machine includes a felling head arranged to be set near a tree to be felled, a saw device fitted to the felling head for performing sawing on the tree and means for operating the felling head and saw device, wherein a data system belong to the forest machine is arranged to recorded a level relative to a ground surface selected for the saw device, before sawing.
14. The system according to claim 13 , wherein the system is arranged to implement the method according to claim 2 .
15. The system according to claim 13 , wherein the forest machine's data system includes a boom-tip-control system and sensoring it requires.
16. The system according to claim 13 , wherein the system is arranged to implement the method according to claim 3 .
17. The system according to claim 13 , wherein the system is arranged to implement the method according to claim 4 .
18. The system according to claim 13 , wherein the system is arranged to implement the method according to claim 6 .
19. The system according to claim 13 , wherein the system is arranged to implement the method according to claim 7 .
20. The system according to claim 13 , wherein the system is arranged to implement the method according to claim 9 .