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Timber harvester on huge tires gripping a tree trunk with its cutting head in a dense forest. A detailed page you can download as a free PDF.
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Download PDFPrintForest harvester with a glass cab, hydraulic boom, cutting head clamped on a trunk, big tires, evergreen forest and cut stumps.
Use different browns for the bark and the pale wood of the stumps.
Draw a young seedling planted where one of the stumps stands.
Stripped limbs are often laid down as a mat that shields the soil.
A timber harvester does in moments what once took a crew with axes and saws hours to finish. Its head grabs the tree, cuts it at the base, strips the branches and slices the trunk into logs of just the right length, all without the operator leaving the cab.
The head is a clever piece of gear. Arms clamp around the trunk and a chain saw cuts through it. As the tree tips over, spiked rollers feed it through the head while knives shave off the limbs. A sensor measures length and diameter, and a computer picks where to cut to get the most usable wood.
These machines were developed mainly in the Nordic countries, home to vast evergreen forests. They work alongside a forwarder, another machine that picks up the cut logs and carries them to the forest road where trucks wait.
Big tires and a hinged frame let the harvester cross rough ground while doing less damage to the soil. And not every tree gets cut: crews often thin a forest, removing only some trees so the rest get more sunlight and grow stronger.
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