Swing yarder: Difference between revisions

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A swing yarder is a mobile piece of heavy duty forestry equipment used for pulling logs from the woods to a logging road with wire rope (cables). The swing yarder has several drums to pull in the wire rope. The wire rope runs up am angled boom and then to the far side of a setting. By using a minimum of two cables, logs can be pulled across a logging setting where the trees have been previously felled. This machine is most suitable for steep ground where it is difficult to access the logs with other machinery. Swing Yarders can also be used in flatter areas with lighter loads.

While there are various rigging options, the most common one uses a grapple that can be lowered onto a logs and closed via the cable system. Using a grapple avoids the need for people in the setting to attach chokers to the log. Choker setting as a profession is a very dangerous occupation.

The main difference between a swing yarder and a tower yarder is that the upperworks is mounted on a large slewing bearing. This bearing permits the boom and cable system to be 'swung' across a setting without relocating the machine. An experienced operator uses timing and cable tension to swing the grapple to the desired location.

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-A '''swing yarder''' is a piece of [[forestry]] [[machine|equipment]] used for hauling logs to a roadside.  The swing yarder uses a series of [[drum (disambiguation)|drum]]s with wire cables that run up a [[boom]] to the far side of a setting to pull the wood across a setting where the trees have been previously felled.  This machine is most suitable for steeper ground where it is difficult to access with other machinery but can also be used in flatter areas with lighter loads.  While there are various rigging options, the most common one involves a grapple that can be set onto the logs and closed via the cable system.  This avoids the need to have people in the setting to attach chokers to the log, which has traditionally been a very dangerous occupation.
+A '''swing yarder''' is a mobile piece of heavy duty [[forestry]] [[machine|equipment]] used for pulling logs from the woods to a logging road with wire rope (cables).  The swing yarder has several [[drum (disambiguation)|drum]]s to pull in the wire rope.  The wire rope runs up am angled [[boom]] and then to the far side of a setting.  By using a minimum of two cables, logs can be pulled across a logging setting where the trees have been previously felled.  This machine is most suitable for steep ground where it is difficult to access the logs with other machinery.  Swing Yarders can also be used in flatter areas with lighter loads.
+While there are various rigging options, the most common one uses a grapple that can be lowered onto a logs and closed via the cable system.  Using a grapple avoids the need for people in the setting to attach chokers to the log.  Choker setting as a profession is a very dangerous occupation.
-A swing yarder upperworks is mounted on a large slewing [[bearing (mechanical)|bearing]] which permits the cable system to be moved across a setting a certain amount without relocating the machine.  An experienced operator can swing the [[grapple (construction)|grapple]] and place it where desired by timing when the cables are slacked off.
+The main difference between a swing yarder and a tower yarder is that the upperworks is mounted on a large slewing [[bearing (mechanical)|bearing]].  This bearing permits the boom and cable system to be 'swung' across a setting without relocating the machine.  An experienced operator uses timing and cable tension to swing the [[grapple (construction)|grapple]] to the desired location.
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