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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.
321:"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.
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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
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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 0.76 meters (30 in) in diameter was developed in the US called The Mammoth Tree Shears. After shearing off the tree, the operator
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Harvesters are routinely available for cutting trees up to 900 millimetres (35 in) in diameter, built on vehicles weighing up to 20 metric tons (20 long tons; 22 short tons), with a boom reaching up to 10 metres (33 ft) radius. Larger, heavier vehicles do more damage to the
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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
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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
291:", and the harvester and forwarder allow this to be achieved. Keeping workers inside the driving cab of the machine provides a safer and more comfortable working environment for industrial scale logging.
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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 by
Finnish systems engineer
318:, 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.
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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.
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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.
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to cut the tree at its base, and cut it to length. The saw is hydraulically powered, rather than using the
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of a portable version. It has a stronger chain and a higher power output than any saw a person can carry.
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A typical harvester head consists of (from bottom to top, with head in vertical position)
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two or more curved delimbing knives which reach around the trunk to remove branches.
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Department of Forest
Resource Management, University of Helsinki, Finland. 1992.
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diameter sensors to calculate the volume of timber harvested in conjunction with
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Harvesters are built on a robust all terrain vehicle, either
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208:. A forest harvester is typically employed together with a
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Organization and technology of wood harvesting in
Finland.
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314:. An extensible, articulated boom, similar to that on an
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https://www.youtube.com/channel/UCMmjUfmI81ZTBZFDKs6e44Q
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Type of forestry vehicle employed in logging operations
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Logging complex (harvester) at work. Buryatia, Russia
49:. Unsourced material may be challenged and removed.
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394:The approximate equivalent type of vehicle in
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452:. Unsourced material may be challenged and
239:Forest harvesters were mainly developed in
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472:Learn how and when to remove this message
109:Learn how and when to remove this message
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58:"Harvester" forestry
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582:"Paul Bunyan Scissors."
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606:Harvesters (forestry)
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191:cut-to-length logging
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446:improve this section
43:improve this article
842:Aerial firefighting
587:, July 1946, p. 83.
185:is a type of heavy
177:harvester in Sweden
1407:Forestry equipment
1182:Hydraulic debarker
1157:Firewood processor
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688:Groasis Waterboxx
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304:walking excavator
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212:that hauls the
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99:December 2006
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60: –
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54:Find sources:
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38:
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32:This article
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21:
20:
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1172:Hand compass
1124:Steam donkey
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1009:Lumber edger
994:Crosscut saw
939:Log splitter
864:Fire flapper
819:Tree caliper
787:Inclinometer
772:Cruising rod
721:(Tuley tube)
719:Tree shelter
715:(dibble bar)
703:Root trainer
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501:Kone Ketonen
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444:Please help
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398:systems are
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389:forest floor
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325:Felling head
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289:forest floor
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274:clearcutting
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189:employed in
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41:Please help
36:verification
33:
1367:Woodworking
1237:Woodchipper
1029:Two-man saw
944:Marking axe
925:(shake axe)
824:Wedge prism
797:Rangefinder
757:Angle gauge
744:Mensuration
677:Caulk boots
525:SP Maskiner
511:Caterpillar
1391:Categories
1255:Categories
1077:Helicopter
918:Brush hook
752:3D scanner
725:Tree spade
698:Pottiputki
554:References
536:John Deere
534:(owned by
532:Timberjack
504:AFM-Forest
462:April 2021
302:, or on a
278:chain saws
258:plantation
254:harvesting
175:John Deere
164:Timberjack
139:6-wheeled
69:newspapers
1287:equipment
1265:equipment
1217:Tree tyer
1197:Log flume
1177:Hand hook
1107:Skid cone
1102:Pike pole
1097:Pickaroon
1082:Log truck
1072:Harvester
1062:Forwarder
1052:Cant hook
886:(rakehoe)
869:Fire rake
859:Driptorch
814:Relascope
809:Microtome
708:Seed trap
656:equipment
542:Kesla Oyj
433:does not
355:chain saw
316:excavator
260:forests.
218:forwarder
199:delimbing
183:harvester
166:harvester
155:harvester
143:harvester
1322:Forestry
1312:Cleaning
1192:Log pond
1152:Denailer
1067:Go-devil
1004:Head saw
977:Chainsaw
913:Broadaxe
908:Billhook
879:Helitack
684:(hoedag)
649:Forestry
546:Prosilva
528:Tigercat
343:chainsaw
282:thinning
1402:Logging
1347:Masonry
1337:Kitchen
1277:Commons
1202:Machete
1112:Skidder
1044:Logging
1034:Whipsaw
1014:Polesaw
999:Dragsaw
972:Bucksaw
967:Bow saw
929:Hatchet
890:Pulaski
693:Mattock
454:removed
439:sources
368:knives.
345:visible
300:tracked
296:wheeled
245:Finland
235:History
210:skidder
203:bucking
195:felling
83:scholar
1357:Mining
1327:Garden
1222:Tsakat
1129:Yarder
1092:Peavey
934:Labrys
884:McLeod
682:Hoedad
521:Ponsse
498:EcoLog
494:Logset
489:Rottne
241:Sweden
153:Rottne
141:Valmet
85:
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71:
64:
56:
1362:Power
1282:tools
1260:tools
1145:Other
1134:swing
1024:Resaw
847:DC-10
802:laser
767:Chain
652:tools
206:trees
90:JSTOR
76:books
1332:Hand
959:Saws
923:Froe
900:Axes
852:UAVs
654:and
437:any
435:cite
268:Uses
243:and
214:logs
201:and
62:news
448:by
256:of
45:by
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