Machine Shop Glossary
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Telescoping Gage: A T-shaped gage used to measure the diameter or width of holes.
Tempering: A heat-treating process to relieve the stresses produced when hardening and to impart certain qualities, such as toughness: sometimes called “drawing.”
Template: A pattern or guide for laying out or machining to a specific shape or form.
Tensile Strength: The resistance to breaking exhibited by a material when subjected to a pulling stress. Measured in lb/in˛ or kPa.
Thermal Expansion: The expansion of materials caused by heat input.
Thermal Stress Relieving: A process of relieving stresses by uniform heating of a structure or a portion of a structure, followed by uniform cooling.
Thread: A helical projection of uniform section on the internal or external surface of cylinder or cone. Also, the operation of cutting a screw thread.
Thread Axis: A line running lengthwise through the center of the screw.
Thread Crest: The top surface joining the two sides of a thread.
Thread Depth: The distance between the crest and the root of a thread.
Thread Micrometer: A micrometer in which the spindle is ground to a point having a conical angle of 60 degrees. The anvil, instead of being flat has a 60-degree V-Shaped groove, which fits the thread.
Thread Pitch: The distance from a point on one screw thread to a corresponding point on the next thread.
Thread Pitch Diameter: The diameter of a screw thread measured from the thread pitch line on one side to the thread pitch line on the opposite side.
Thread Root: The bottom surface joining the sides of two adjacent threads.
Tool Steel: A general classification for high-carbon steel that can be heat treated to a hardness required for metal cutting tools such as punches, dies, drills, taps, reamers and so forth.
Torsion: The stress produced in a body, such as a rod or wire, by turning or twisting one end while the other is held firm or twisting in the opposite direction.
Traverse: One movement across the surface of the work being machined.
Truing: The act of centering or aligning a workpiece or cutting tool so that an operation may be performed accurately. Also, correcting the eccentricity or out of round condition when dressing a gri . . . View Full Definition
Tumbler Gears: A pair of small lever-mounted gears on a lathe used to engage or to change the direction of the leadscrew.
Twist Drill: A commonly used metal-cutting drill, usually made with two flutes running around the body.
Two-Lip End Mill: An end-milling cutter designed with teeth that cut to the center so that it may be used to feed into the work like a drill.
Ultimate Tensile Strength (UTS): The maximum tensile stress a material placed in tension can bear without breaking.
Universal Milling Machine: A milling machine with a worktable that can be swiveled for milling helical work. It is always supplied with attachments, including an indexing fixture.
Universal Vise: A vise designed for holding work at a double or compound angle. Also called a toolmakers’ vise.
Volt: A unit of electrical force or potential.
Word of the Day:
Penetration: When the ball is dribbled or passed inside the defensive area toward the basket.