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| Tachometer (AC) (DC) |
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A device which generates an AC or DC signal proportional to the speed at which it is rotated and the polarity of which is dependent on the direction of rotation of the rotor.
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| Tailspar |
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A spar at the outer end of a skyline system, away from the landing, which elevates and supports one end of the skyline.
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| Tailtree |
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A standing tree used as tailspar.
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| Tangential |
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A tangential section is a longitudinal section through a tree perpendicular to a radius. Flat-grain lumber is sawn tangentially.
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| Tank |
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The reservoir or sump.
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| Taper |
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1. The difference in diameter between the top end and the butt end of a log.
2. Boards that are thicker or wider on one end than on the other. Graded as skip.
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| Target moisture content |
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The amount of moisture targeted to be left in the lumber at the end of a dry kiln charge.
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| Target size |
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The size that lumber must be cut in the green form to allow for sawing deviation, shrinkage in drying and allowance for fibre removed in the finishing process.
View: Target Size
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| Temperature drop across the load (TDAL) |
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Also called DAL and Delta T (change in temperature). The temperature of the air entering a package minus the temperature of the air exiting a package.
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| Temposonics |
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Linear displacement transducer.
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| Tension gauge |
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Similar to a straightedge but having a convex edge, the curvature of which exactly coincides with the concave curvature of a properly tensioned saw; used when making the test for tension.
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| Tension or tensioning |
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A method of stretching the saw body in the inner area of either a circular saw or band saw to compensate for heating that expands the circular saw periphery or the band saw edges. The amount of tension required is affected by gauge, saw speed, number and kind of teeth, diameter of a circle saw, width of a band saw, wood species, horsepower, feed speed, etc. As a general rule on circular saw, large, thin, fast, heavily loaded saws require more tension than small, thick, slow, lightly loaded saws. Wide, thick band saws require more tension than narrow, thin bands. A very thin, narrow band may need no tensioning.
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| Tension wood |
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Abnormal wood found in leaning trees of some species and characterized by the presence of gelatinous fibers and excessive longitudinal shrinkage. Tension wood fibers hold together tenaciously, so that the sawed surfaces usually have projecting fibers, and planed surfaces often are torn or have raised grain. Tension wood may cause warping.
View: Compression Wood
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| Thermal oil |
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A heat transfer fluid used instead of steam. They are not interchangeable within the same kiln. Thermal oil is capable of higher temperatures at low operating pressure and is not susceptible to freezing.
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| Thermocouple (TC) |
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A sensor that measures temperature based on the voltage difference between two dissimilar metals.
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| Thermomechanical pulp (TMP) |
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A high yield pulp produced by a process in which wood chips are softened by preheating under pressure prior to mechanical separation into a mass of fibers.
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| Thermosetting glues and resins |
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Glues and resins that are cured with heat but do not soften when subsequently subjected to high temperatures.
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| Thinning |
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A practice in which certain trees are removed from a dense stand to allow the remaining trees adequate sunlight, nutrients and moisture to grow at an even rate.
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| Tier |
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Horizontal course in a stack of lumber.
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| Timber supply area (TSA) |
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An area of forest land designated by the Minister of Forests of British Columbia and allocated an AAC from which non-area based timber tenures are granted.
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| Timber, standing |
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Timber still standing of the stump.
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| Timbers |
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Lumber that is nominally 5 inches or more in least dimension. Timbers may be used as beams, stringers, posts, caps, sills, girders, purlins, and so forth.
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| Timbers, round |
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Timbers used in the original round form, such as poles, piling, posts, and mine timbers.
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| Ton (T) |
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1. US unit of weight equal to 2,000 lb; also called a Short ton.
2. British unit of weight equal to 2,240 lb (1,016 kg); also called a Long ton.
View: Metric / Imperial Conversion
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| Tongue and groove |
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Lumber machined to have a groove on one side and a protruding tongue on the other, so that pieces will fit snugly together, with the tongue of one fitting into the groove of the other.
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| Tonne |
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A unit of weight in the metric system equal to 1,000 kilograms or approximately 2,204 pounds. Also called a Metric ton.
View: Metric / Imperial Conversion
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| Tooth bite |
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The length of cut for each tooth on a saw as wood is feed to the saw. Tooth bite will vary based on arbor rpm, tooth pitch, saw diameter and feed speed.
View: Bandmill Formula, Gang Edger Formula, Quad Sawbox Formula
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| Tooth pitch |
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The distance between teeth on a saw.
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| Tooth pressure |
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The force each tooth exerts when cutting.
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| Top bevel |
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An angle filed across the top of the tooth, usually staggered on alternate teeth. If all teeth are angled in one direction, the saw will pull to one side.
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| Top clearance |
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The angle of clearance on the top of a saw tooth. Also "Clearance angle" or "Back clearance angle".
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| Torque |
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A rotary thrust. The turning effort of a fluid motor usually expressed in inch pounds.
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| Torque converter |
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A rotary fluid coupling that is capable of multiplying torque.
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| Torque motor |
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A type of electromechanical transducer having rotary motion used in the input stages of servo valves.
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| Total reduced sulphur (TRS) |
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Sulphur compounds produced in a kraft pulping process that can exhibit a "rotten egg" smell.
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| Total suspended solids (TSS) |
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The total amount of suspended solids dispersed in a liquid.
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| Tower |
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A steel mast or framework, generally portable, used instead of a spar tree for cable yarding.
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| TPD |
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Tons per day.
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| Tracheids, longitudinal |
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The elongated cells or fibers that comprise the majority of the anatomical structure of softwoods. Also present in some hardwoods.
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| Transducer (or feedback transducer) |
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An element which measures the results at the load and sends a signal back to the amplifier.
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| Traps |
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A device that separates condensate and air from the steam within the steam heating coils.
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| Traps, float and thermostatic |
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Traps that discharge condensate at a rate dependent on the position of an internal float. Air is removed through a thermostatic air vent.
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| Traps, inverted bucket |
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Mechanical traps that operate on the difference in the density between steam and water.
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| Traps, orifice |
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Traps that discharge steam at a constant rate and have no internal moving parts to alter or stem its flow.
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| Traps, thermostatic |
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Traps that use an internal bellows, which expands when steam flows to the trap, closing the orifice. As condensate accumulates the bellows contracts to release it.
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| Trim |
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The amount of extra length allowed when bucking logs or sawing green lumber to compensate for end checking and damage in transit, and for "squaring up" at the mill. The allowance is specified in contracts and by log scaling agencies.
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| Trimmer |
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Machine centre with multiple saws for trimming defect from boards and producing a defined length of lumber.
View: Trimmer Examples
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| Trimming |
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The manufacturing step that squares the length of boards.
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| Truss |
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An assembly of members combined to form a rigid framework. All members are interconnected to form triangles. Light frame trusses are made from dimension lumber restrained by toothed plates. Heavy trusses are made for large members restrained by bolts and connectors or glulam rivets.
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| Turbine |
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A rotary device that is actuated by the impact of a moving fluid against blades or vanes.
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| Turbulent flow (turbulence) |
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A condition where the fluid particles move in random paths rather than in continuous parallel paths.
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| Turn |
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Any log or group of logs attached by some means to power and moved from a point of rest to a landing.
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| Twin circular |
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A mill that has both a right-hand and a left-hand saw; used to slab logs or to rip cants. Both saws may be so mounted as to permit altering the distance between them. Also used to describe an over-under circular saw headrig.
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| Twist |
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A spiral distortion along the length of a piece of timber so that the four corners of any face are no longer in the same plane.
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| Twists |
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Ridged projections on the surface of a circular saw.
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| Two-way valve |
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A directional control valve with two flow paths.
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