Sawmill

A sawmill or lumber mill describes either a facility where logs are cut into lumber, or the machine that mills the logs in such a facility. Modern sawmills use a motorized saw powered by either electricity or an internal combustion engine to cut logs lengthwise to make long pieces known as flitches, and crosswise to length depending on standard or custom sizes. The "portable" sawmill is a mobile version that is less complicated to operate, for a single sawyer.

The log lies flat on a steel bed, and the motorized saw cuts the log horizontally along the length of the bed, either driven by a separate motor or by the operator manually pushing the saw.
The most basic kind of sawmill consists of a chainsaw and a customized jig, with similar horizontal operation.
The chainsaws used in these mills cut with a ripping chain ground to cut along the length of the log as opposed to across the diameter of the log.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0