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.

A method for controlling a boom assembly, the boom assembly being adapted for use on a forestry vehicle, the boom assembly comprising at least two booms, which are movably connected to each other and the vehicle, the boom assembly being controlled by hydraulic power, further comprising an extension boom, which comprises a free end of the boom assembly and a boom tip, the extension boom being linearly movable, the boom assembly comprising a position sensor to measure the position of the extension boom, a control unit, adapted to transfer operator commands to control the boom assembly, adapted to receive and calculate the position data from the extension boom, wherein, when the operator issues a command to bring the boom tip closer to the vehicle, in case the extension boom is positioned beyond a predetermined extension limit, the control unit will solely first control the extension boom.

A method for controlling a boom assembly, the boom assembly being adapted for use on a forestry vehicle, the boom assembly comprising at least two booms, which are movably connected to each other and the vehicle, the boom assembly being controlled by hydraulic power, further comprising an extension boom, which comprises a free end of the boom assembly and a boom tip, the extension boom being linearly movable, the boom assembly comprising a position sensor to measure the position of the extension boom, a control unit, adapted to transfer operator commands to control the boom assembly, adapted to receive and calculate the position data from the extension boom, wherein, when the operator issues a command to bring the boom tip closer to the vehicle, in case the extension boom is positioned beyond a predetermined extension limit, the control unit will solely first control the extension boom.

A method and a control system for controlling a boom of a forest work machine by tip control. In the method and the control system, a coordinate system of the forest work machine, a coordinate system of a work environment of the forest work machine and dependence between said coordinate systems are determined. As a response to a control command for controlling a tip of the boom of the forest work machine in motion to a target position or for keeping it in the target position in the coordinate system of the work environment, the attitude and/or state of motion of boom parts of the boom in the coordinate system of the forest work machine is determined and said control command of the tip of the boom of the forest work machine in motion is converted at least into at least one control measure of at least one actuator of the boom based on the determined attitude and/or the state of motion of the boom parts of the boom and on the dependence between the coordinate systems.

A method and a control system for controlling a boom of a forest work machine by tip control. In the method and the control system, a coordinate system of the forest work machine, a coordinate system of a work environment of the forest work machine and dependence between said coordinate systems are determined. As a response to a control command for controlling a tip of the boom of the forest work machine in motion to a target position or for keeping it in the target position in the coordinate system of the work environment, the attitude and/or state of motion of boom parts of the boom in the coordinate system of the forest work machine is determined and said control command of the tip of the boom of the forest work machine in motion is converted at least into at least one control measure of at least one actuator of the boom based on the determined attitude and/or the state of motion of the boom parts of the boom and on the dependence between the coordinate systems.

A marking element for tree trunks, with a base plate that has an striking surface and a cutting surface facing away from the striking surface. A cutting edge protrudes from the cutting surface and an electronic information carrier is attached to the base plate, which has a memory module and an antenna that is electrically connected to the memory module. The antenna has an antenna section which protrudes laterally beyond the striking surface and beyond the cutting surface.

A marking element for tree trunks, with a base plate that has an striking surface and a cutting surface facing away from the striking surface. A cutting edge protrudes from the cutting surface and an electronic information carrier is attached to the base plate, which has a memory module and an antenna that is electrically connected to the memory module. The antenna has an antenna section which protrudes laterally beyond the striking surface and beyond the cutting surface.

A spreading device, a powder-like mixture composition and a method tor spreading the composition for control or prevent forest pathogens on tree stumps are disclosed.

A spreading device, a powder-like mixture composition and a method tor spreading the composition for control or prevent forest pathogens on tree stumps are disclosed.

An adjustable tree jack configured for assembly and disassembly into smaller, hand-carried sub-assemblies for field portability including an adjustable jack stand compatible with a variety of jack mechanisms, and a selected jack mechanism. A representative jack stand includes a base, a lower frame removably connectible to the base, and a telescoping riser removably receivable by a riser receiver of the lower frame. The lower frame defines a slot and the telescoping riser includes a lifting rod removably receivable within the slot. The jack mechanism is removably capturable between a support bracket and the lifting rod for lifting and lowering the telescoping riser under load allowing the telescoping riser to be lifted under load causing lifting displacement of the telescoping riser with respect to the lower frame with the lifting rod traveling within the slot.