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The single blade travels horizontally in one direction down the log, and returns in vertical position, thus removing a sawn piece of timber. The swingblade head unit is normally mounted on a moving frame that travels along a track or tracks, up and down a stationary log. [1]
Log driving is a means of moving logs (sawn tree trunks) from a forest to sawmills and pulp mills downstream using the current of a river. It was the main transportation method of the early logging industry in Europe and North America .
Logs further from the road can be shoveled to the landing in a few passes back and forth. Skidding and cable logging can be more cost efficient for logs further from the road. Shovel logging can make use of the loader between log truck arrivals. It can also reduce soil disturbance, since it requires only a single pass to move all the logs in reach.
Logs were moved more efficiently by railroads built into remote forest areas, often supported by additional methods like high-wheel loaders, tractors and log flumes. [14] The largest high-wheel loader, the "Bunyan Buggie," was built in 1960 for service in California, featuring wheels 24 feet (7.3 m) high. [15]
The circular motion of the wheel was converted to a reciprocating motion at the saw blade. Generally, only the saw was powered, and the logs had to be loaded and moved by hand. An early improvement was the development of a movable carriage, also water powered, to move the log steadily through the saw blade.
Horse skidder with high wheels. Early skidders were pulled by a team of oxen, horses or mules. The driver would straddle the cart over felled logs, where dangling tongs would be positioned to raise the end of the log off the ground. The team pulled the tongue forward, allowing the log to "skid" along between the rolling wheels.
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Oshkosh M911 tractor hauling logs. A logging truck or timber lorry is a large truck used to carry logs. [1] Some have integrated flatbeds, some are discrete tractor units, and some are configured to spread a load between the tractor unit and a dollied trailer pulled behind it. Often more than one trailer is attached.