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| Mainline |
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The cable used to haul logs into the landing. Some cable yarder configurations, such as running skyline, may have more than one mainline.
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| Manifold |
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A fluid conductor which provides multiple connection ports.
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| Manual control |
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A control actuated by the operator, regardless of the means of actuation. Example: Lever or foot pedal control for directional valves.
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| Manual override |
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A means of manually actuating an automatically-controlled device.
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| Manufactured housing |
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Housing units partially or completely built in a factory.
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| Marine borers |
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Mollusks and crustaceans which attack submerged wood in salt and brackish water.
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| Market pulp |
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White pulp from hardwood trees that is dried into thick blotter-like sheets and baled for shipment to a paper mill for re-pulping to make paper products.
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| Material balance |
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A relationship, often portrayed in a diagram, that shows how all components of a raw material are allocated and used.
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| MBF |
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Thousand board feet.
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| Mechanical control |
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Any control actuated by linkages, gears, screws, cams or other mechanical elements.
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| Mechanical pulping |
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The production of fibers and fiber bundles by grinding wood with pulpstones or by mechanical refiners as opposed to chemical methods.
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| Mechanically laminated timber |
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Laminated timber where the laminations are joined with mechanical fasteners.
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| Medium density fiberboard (MDF) |
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A panel product manufactured from lignocellulosic fibers combined with a synthetic resin or other suitable binder. The panels are manufactured to a density of 31 pcf (0.50 specific gravity) to 55 pcf (0.88 specific gravity) by the application of heat and pressure by a process in which the interfiber bond is substantially created by the added binder. Other materials may have been added during manufacturing to improve certain properties.
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| Mende-process board |
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Made in a continuous ribbon from wood particles with thermosetting resins used to bond the particles. Thickness ranges from 1/32 to 1/4 inch.
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| Merchantable timber |
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A tree or stand that has attained sufficient size, quality and/or volume to make it suitable for harvesting.
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| Meter |
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To regulate the amount or rate of fluid flow.
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| Meter-in |
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To regulate the amount of fluid flow into an actuator or system.
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| Meter-out |
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To regulate the flow of the discharge fluid from an actuator or system.
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| Metre (m) |
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The metric basic unit for linear measurement equal to 39.37 inches (1.094 yards).
View: Metric / Imperial Conversion
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| Mfbm |
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Thousand board feet.
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| Micron |
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One-millionth of a metre or approximately .00004 inch.
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| Micron rating |
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The size of the particles a filter will remove.
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| Mile (mi) |
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A unit of linear measurement on land, equivalent to 5,280 feet (1,760 yd) or 1.6 kilometres.
View: Metric / Imperial Conversion
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| Millimetre (mm) |
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A unit of length equal to one thousandth of a metre (0.0394 inches).
View: Metric / Imperial Conversion
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| Millwork |
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Planed and patterned lumber for finish work in buildings, including items such as sash, doors, cornices, panelwork, and other items of interior or exterior trim, but not flooring or siding.
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| Mineral stain |
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An olive to greenish-black or brown discoloration believed to show regions of abnormal concentrations of mineral matter in some hardwoods. It is common in hard maple, hickory, and basswood. See also Mineral streaks.
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| Mineral streak |
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A discoloration of hardwood and hardwood veneer.
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| Mismanufacture |
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Wood imperfections or blemishes that result from manufacture.
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| MMBF |
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Million board feet.
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| MMSF |
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A unit of measure for MDF equal to one million square feet on a 3/4 inch basis.
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| Modular housing |
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A type of housing in which major components are assembled in a factory and then shipped to the building site to be joined with other components to form the finished structure.
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| Modulate |
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To control within an infinite range between 0 percent and 100 percent as opposed to on/off control.
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| Moisture content |
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The amount of water contained in the wood, either expressed as a percentage of the weight of the oven-dry wood or as a percentage of total weight of a piece.
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| Moisture distribution |
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Variation in moisture content within a board and/or variation in moisture content between boards.
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| Moisture gradient |
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The difference in moisture content between areas of a board. Usually refers to the moisture content difference between the surface and core of a board.
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| Monitor |
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Screen on which an electronics systems display information.
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| Motor |
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A device which converts electricity or hydraulic fluid power into mechanical force and motion. It usually provides rotary mechanical motion.
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| Motor control center (MCC) |
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Central location for circuit breakers for mill equipment.
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| Moulding |
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A wood strip having a curved or projecting surface used for decorative purposes.
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| Mountain pine beetle |
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A beetle that kills pine trees by eating the living layer of circulatory tissue underneath the bark of the tree. If the infected trees are not harvested in a timely manner the infestation will kill trees at an increasing rate.
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| MSF |
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Is a unit of measure for MDF and plywood equal to 1,000 square feet, on a 3/4 inch basis for MDF and on a 3/8 inch basis for plywood, and MMSF means one million square feet.
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| MSR |
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Machine stress rated lumber is dimension lumber that has been evaluated by mechanical stress-rating equipment. The stress-rating equipment measures the stiffness of the material and sorts it into various modulus of elasticity (E) classes.
View: MSR Examples
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| Multizone |
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Technique of dividing a dry kiln into more than two zones of heat control. Used in steam and hot oil kilns.
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