Single Function Machines Chipper – Designed to chip whole trees or their parts
Debarker – Designed to remove the bark from trees.
Drum Debarker – Used to remove bark from pulpwood. Bolts tumble together forcibly and repeatedly in their passage through a large drum, rubbing off bark as they roll against each other and against the corrugated interior of the drum. The drum’s corrugated interior keeps the bolts tumbling as the drum rotates, while gravity and the force of additional incoming bolts force the wood through.
Ring Debarker – Used to remove bark from saw logs and veneer bolts. As the in-feed conveyor advances the log longitudinally into the feed rollers, it automatically centers the log in the rotating mechanical ring. The ring has five crescent-shaped fingers that open automatically as the feed rollers force the log against them and the log advances through the rotating mechanical ring.
Delimber – Self-propelled or mobile machine designed to remove all limbs from trees with flailing chains or knives.
Feller – Self-propelled machine designed to fell standing trees.
Forwarder – Self-propelled machine, usually self-loading, designed to transport trees or their parts by carrying them completely off the ground.
Loader – Self-propelled or mobile machine with grapple and supporting structure designed to pick up and discharge trees or their parts for the purpose of loading or piling. Operation may be swing-to-load, slide-to-load, or travel-to-load. Also known as hydraulic loader or knuckle-boom if it swings to load and has hydraulically activated boom members.
Mobile Yarder – Self-propelled or mobile machine designed to perform cable logging with the use of a tower that may be integral to the machine or a separate structure.
Skidder – Self-propelled machine designed to transport trees or pans of trees by dragging or trailing.
Cable Skidder – Uses a man winch cable and cable chokers to assemble or hold a load.
Clam-Bunk Skidder – Uses an integrally mounted loader to assemble the load and clam or top-opening jaws to hold it. A grapple skidder uses a grapple or bottom-opening jaws to assemble and hold a load.
Slasher – Mobile machine designed to cut felled trees to a predetermined length with a shear or saw. Also known as a bucker.
Swath Cutter – Self-propelled harvesting machine capable of continuous movement while simultaneously felling multiple stems across a 6 to 8 foot wide swath.
Multi-Function Machines Delimber Buncher – Used to delimb trees and arrange logs in piles on the ground.
Delimber Slasher – Used to delimb and slash trees. Also known as a Delimber bucker.
Delimber Slasher Bucker – Used to delimb and slash trees and arrange logs in piles on the ground.
Feller Buncher – Self-propelled machine designed to fell standing trees and arrange them in bunches on the ground. May travel-to-bunch or swing-to-bunch.
Feller Chipper – Used to chip and fell whole trees.
Feller Delimber – Self-propelled machine designed to fell and delimb trees.
Feller Delimber Buncher – Self-propelled machine designed to fell, delimb, and arrange the trees in bunches. A feller Delimber Slasher buncher is a self-propelled machine designed to fell, delimb, and slash trees and arrange the tree parts in piles on the ground.
Fell Delimber Slasher Forwarder – Self-propelled machine designed to fell, delimb, and slash trees and carry tree parts to a landing.
Feller Forwarder – Self-propelled, self-loading machine designed to fell standing trees and transport the stems by carrying them completely off the ground.
Feller Skidder – Self-propelled, self-loading machine designed to fell standing trees and transport them by skidding.
Harvester – Self-propelled multifunction machine that may be capable of operating as a swath cutter but also performs chipping and/or forwarding functions in addition to felling.
Limited-Area Feller Buncher – Feller-buncher with a shear mounted on a knuckle-boom, allowing the machine to reach and fell several trees while remaining stationary.
Processor – Multifunction machine that does not fell trees but handles two or more subsequent functions.
Slasher Buncher – Used to cut logs to predetermined lengths and arrange them in piles on the ground.