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The New Harvester 931 Komatsu
The New Harvester 931 Komatsu
Published: 2014/10/28
Channel: woodharvesting
Harvester John Deere 1270G - 8 Wheels
Harvester John Deere 1270G - 8 Wheels
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Channel: woodharvesting
#Amazing walking tree harvester, extreme forestry machines, amazing tree cutter machines equipment #
#Amazing walking tree harvester, extreme forestry machines, amazing tree cutter machines equipment #
Published: 2016/12/20
Channel: giricaplaza
ClimbMAX steep slope forestry harvester
ClimbMAX steep slope forestry harvester
Published: 2016/09/18
Channel: ClimbMAX
Huge trees being felled by John Deere Harvester in Galloway Forest, Scotland.
Huge trees being felled by John Deere Harvester in Galloway Forest, Scotland.
Published: 2016/01/20
Channel: Andrew Mellor
79. Wanna see a forest harvester, check this scorpion!
79. Wanna see a forest harvester, check this scorpion!
Published: 2013/06/22
Channel: Fotolainen
IMPRESSIVE Harvester by John Deere! Epic machine!
IMPRESSIVE Harvester by John Deere! Epic machine!
Published: 2016/04/13
Channel: monsterchannel24
Drive a tree harvester (forest machine) inside cabin
Drive a tree harvester (forest machine) inside cabin
Published: 2015/02/02
Channel: Skogsforum.se on YouTube
Track Harvester Sennebogen 718 Forestry
Track Harvester Sennebogen 718 Forestry
Published: 2013/08/16
Channel: woodharvesting
FOREST MACHINE RODEO - Meanwhile In Finland EP 1 | Dudesons
FOREST MACHINE RODEO - Meanwhile In Finland EP 1 | Dudesons
Published: 2017/02/19
Channel: Dudesons
AFM Forest 55 Wood Harvester Head,  Canada
AFM Forest 55 Wood Harvester Head, Canada
Published: 2017/04/25
Channel: Mega Machines Channel
Ponsse Harvester (Moeke Forestry)
Ponsse Harvester (Moeke Forestry)
Published: 2017/02/26
Channel: Moeke Forestry
🌲🌲🌲 Best of Logging 🌲🌲🌲 Compilation
🌲🌲🌲 Best of Logging 🌲🌲🌲 Compilation
Published: 2014/12/24
Channel: Harvester Forwarder & More
Bull Creek Forestry: Tigercat LH822C harvester
Bull Creek Forestry: Tigercat LH822C harvester
Published: 2013/06/24
Channel: TigercatForestry
Kesla harvester with Volvo Ecr145
Kesla harvester with Volvo Ecr145
Published: 2016/01/06
Channel: bruno michaud lavoie
Cat® 501HD Track Harvester with a PD-57 Harvester Head
Cat® 501HD Track Harvester with a PD-57 Harvester Head
Published: 2010/01/12
Channel: Cat Forestry
Maine Forestry - Processor/Harvester
Maine Forestry - Processor/Harvester
Published: 2012/08/16
Channel: Cathy Wolinsky-YES
Ponsse Scorpion King ᴴᴰ
Ponsse Scorpion King ᴴᴰ
Published: 2014/03/30
Channel: MyPonsse
Light effective excavator harvester.mp4
Light effective excavator harvester.mp4
Published: 2011/07/26
Channel: ilmari29
John Deere 1170E Harvester with Processor - Sauerland Forest - Padberg, Germany
John Deere 1170E Harvester with Processor - Sauerland Forest - Padberg, Germany
Published: 2013/08/17
Channel: Hans van het Goor
timberjack harvester extrem, timberjack accident, monster heavy equipment
timberjack harvester extrem, timberjack accident, monster heavy equipment
Published: 2016/07/11
Channel: MissFunzel
The Ultimate Wood Cutting Vehicle
The Ultimate Wood Cutting Vehicle
Published: 2012/01/14
Channel: jamsheerlive
Komatsu Forest Harvester Training Simulator
Komatsu Forest Harvester Training Simulator
Published: 2011/06/24
Channel: woodharvesting
Timberjack harvester in a forest on Gotland in June 2017
Timberjack harvester in a forest on Gotland in June 2017
Published: 2017/06/15
Channel: Olof Söderberg
Logset 12H GTE Hybrid - Biggest Harvester!!!
Logset 12H GTE Hybrid - Biggest Harvester!!!
Published: 2016/05/31
Channel: Harvester Forwarder & More
Stewart forestry harvester
Stewart forestry harvester
Published: 2015/05/19
Channel: jswplant
Cinematic Forestry - Harvester at work
Cinematic Forestry - Harvester at work
Published: 2017/03/14
Channel: EYGENCY // Agentur für Marken & Marketing
Forestry machines in a row from the harvester to the forwarder Valmet, Timberjack and Ponsse
Forestry machines in a row from the harvester to the forwarder Valmet, Timberjack and Ponsse
Published: 2012/09/23
Channel: Olof Söderberg
Waratah
Waratah's big-timber-tackling HTH624C Harvester Head
Published: 2010/11/19
Channel: WaratahAttachments
Forest Machine - Harvester CAT 320D FM
Forest Machine - Harvester CAT 320D FM
Published: 2011/04/26
Channel: woodharvesting
MTZ harvester in forest |praca leśna| erdészeti munka|
MTZ harvester in forest |praca leśna| erdészeti munka|
Published: 2017/02/06
Channel: Anti Viirmets
JOHN DEERE 1270D TIMBER HARVESTER
JOHN DEERE 1270D TIMBER HARVESTER
Published: 2007/01/05
Channel: mohastie
BIG FORESTRY WORK: Cutting Down Threes | TIMBERJACK 1270D Harvester + 762C - JD Engine BRUTAL SOUND
BIG FORESTRY WORK: Cutting Down Threes | TIMBERJACK 1270D Harvester + 762C - JD Engine BRUTAL SOUND
Published: 2017/02/24
Channel: Agri957
First thinning of forest at winter with harvester
First thinning of forest at winter with harvester
Published: 2013/03/14
Channel: Antti Huhtala
forestry harvester 10h logset
forestry harvester 10h logset
Published: 2009/10/03
Channel: sliperytimberjack
Forestry on steep slope
Forestry on steep slope
Published: 2013/04/16
Channel: ADVideofilm
Forestry Tree Harvester GoPro
Forestry Tree Harvester GoPro
Published: 2013/11/07
Channel: Pen Cil
Koehring Shortwood Harvester 1970
Koehring Shortwood Harvester 1970's
Published: 2011/12/04
Channel: JRtransport379
RC Harvester
RC Harvester
Published: 2014/01/30
Channel: RC Nordbau AG
Farming Simulator 2015: Scorpion King Forestry Harvester (MONEY MAKING MACHINE!)
Farming Simulator 2015: Scorpion King Forestry Harvester (MONEY MAKING MACHINE!)
Published: 2014/11/03
Channel: HardcoreGamingTips
PONSSE Scorpion summer video
PONSSE Scorpion summer video
Published: 2013/06/05
Channel: PonssePlc
Naarva S23C stroke harvester in forestry trailer - S23C metsäkärryssä
Naarva S23C stroke harvester in forestry trailer - S23C metsäkärryssä
Published: 2015/08/04
Channel: Naarva
Harvester Komatsu Forest 941.1
Harvester Komatsu Forest 941.1
Published: 2011/11/21
Channel: woodharvesting
Forest machine operator training
Forest machine operator training
Published: 2017/06/14
Channel: Teagasc Forestry
Caterpillar Cut-to-Length Forestry Products
Caterpillar Cut-to-Length Forestry Products
Published: 2009/03/11
Channel: Cat Forestry
Koehring Shortwood Harvester from Ministere de L
Koehring Shortwood Harvester from Ministere de L'education du Quebec
Published: 2013/01/12
Channel: JRtransport379
Harvester John Deere Forestry
Harvester John Deere Forestry
Published: 2010/05/30
Channel: gustavopcastro
Colheita Mecanizada - Harvester Aranha
Colheita Mecanizada - Harvester Aranha
Published: 2010/12/19
Channel: Saymon Soares
Komatsu 931XC Harvester | SPECIAL!!! | 4k
Komatsu 931XC Harvester | SPECIAL!!! | 4k
Published: 2017/03/18
Channel: Harvester Forwarder & More
Doosan DX210W Forestry Exhavator with Woody 60 harvester head
Doosan DX210W Forestry Exhavator with Woody 60 harvester head
Published: 2014/01/08
Channel: Iva Stanoeva
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WIKIPEDIA ARTICLE

From Wikipedia, the free encyclopedia
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6-wheeled Valmet harvester
Small 4-wheeled Rottne harvester
Timberjack harvester
John Deere harvester in Sweden

A harvester is a type of heavy forestry vehicle employed in cut-to-length logging operations for felling, delimbing and bucking trees. A forest harvester is typically employed together with a forwarder that hauls the logs to a roadside landing.

History[edit]

Forest harvesters were mainly developed in Sweden and Finland and today do practically all of the commercial felling in these countries. The first fully mobile timber "harvester", the PIKA model 75, was introduced in 1973[1] by Finnish systems engineer Sakari Pinomäki and his company PIKA Forest Machines. The first single grip harvester head was introduced in the early 1980s by Swedish company SP Maskiner. Their use has become widespread throughout the rest of Northern Europe, particularly in the harvesting of plantation forests.

Before modern harvesters were developed in Finland and Sweden, two inventors from Texas developed a crude tracked unit that sheared off trees at the base up to 30 inches in diameter was developed in the US called The Mammoth Tree Shears. After shearing off the tree, the operator could use his controls to cause the tree to fall either to the right or left. Unlike a harvester, it did not delimb the tree after felling it.[2]

Uses[edit]

Harvesters are employed effectively in level to moderately steep terrain for clearcutting areas of forest. For very steep hills or for removing individual trees, humans working with chain saws are still preferred in some countries. In northern Europe small and manoeuvrable harvesters are used for thinning operations, manual felling is typically only used in extreme conditions, where tree size exceeds the capacity of the harvester head or by small woodlot owners.

The principle aimed for in mechanised logging is "no feet on the forest floor", and the harvester and forwarder allow this to be achieved. Keeping humans inside the driving cab of the machine provides a safer and more comfortable working environment for industrial scale logging.

Harvesters are built on a robust all terrain vehicle, either wheeled, tracked or on Walking Excavator. The vehicle may be articulated to provide tight turning capability around obstacles. A diesel engine provides power for both the vehicle and the harvesting mechanism through hydraulic drive. An extensible, articulated boom, similar to that on an excavator, reaches out from the vehicle to carry the harvester head. Some harvesters are adaptations of excavators with a new harvester head, while others are purpose-built vehicles.

"Combi" machines are available which combine the felling capability of a harvester with the load-carrying capability of a forwarder, allowing a single operator and machine to fell, process and transport trees. These novel type of vehicles are only competitive in operations with short distances to the landing.

Felling head[edit]

Harvester head
Harvester head, chainsaw visible

A typical harvester head consists of (from bottom to top, with head in vertical position)

  • a chain saw to cut the tree at its base, and cut it to length. The saw is hydraulically powered, rather than using the 2-stroke engine of a portable version. It has a stronger chain and a higher power output than any saw a person can carry.
  • two or more curved delimbing knives which reach around the trunk to remove branches.
  • two feed rollers to grasp the tree. The wheels pivot apart to allow the harvester head to grasp the tree and pivot together to hug the tree tightly. The wheels are driven in rotation to force the cut tree stem through the delimbing knives.
  • diameter sensors to calculate the volume of timber harvested in conjunction with
  • a measuring wheel which measures the length of the stem as it is fed through the head.

One operator in the vehicle's cab can control all of these functions. A control computer can simplify mechanical movements and can keep records of the length and diameter of trees cut. Length is computed by either counting the rotations of the gripping wheels or, more commonly, using the measuring wheel. Diameter is computed from the pivot angle of the gripping wheels or delimbing knives when hugging the tree. Length measurement also can be used for automated cutting of the tree into predefined lengths. Computer software can predict the volume of each stem based on analysing stems harvested previously. This information when used in conjunction with price lists for each specific log specification enables the optimisation of log recovery from the stem.

Harvesters are routinely available for cutting trees up to 900 mm in diameter, built on vehicles weighing up to 20 t, with a boom reaching up to 10 m radius. Larger, heavier vehicles do more damage to the forest floor, but a longer reach helps by allowing harvesting of more trees with fewer vehicle movements.

The approximate equivalent type of vehicle in full-tree logging systems are feller-bunchers.

Manufacturers[edit]

References[edit]

  1. ^ Rihko Haarlaa: Organization and technology of wood harvesting in Finland. Department of Forest Resource Management, University of Helsinki, Finland. 1992.
  2. ^ "Paul Bunyan Scissors." Popular Science, July 1946, p. 83.

External links[edit]

Media related to Harvesters (forestry) at Wikimedia Commons


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