Cnc glossary 2

anandengg's version from 2018-03-23 04:13


Question Answer
Caliper– A device used to measure inside or outside dimensions.
Caliper, gear tooth– A special caliper used to measure both the “choral thickness” and the depth of a gear tooth.
Cam –A device for converting regular rotary motion to irregular rotary or reciprocating motion. Sometimes the effect of off-center lathe operations.
Carbide Tool Bits– Lathe cutting tools to which carbide tip inserts have been brazed, to provide cutting action on harder materials than the high speed cutters are capable of.
Carbon Steel– A broad term applied to tool steel other than high-speed or alloy steel.
Carborundum– A trade name for an abrasive compounded of silicon and carbon (silicon carbide).
Carbonizing –The process of adding carbon to the outer surface of steel to improve its quality by heat treating it in contact with a carbonaceous material.
Carriage – A principal part of a lathe that carries the cutting tool and consists of the saddle, compound rest. and apron.
Case Hardening –A heat treating process, basically carbonizing. that makes the surface layer or case of steel substantially harder than the interior or core.
Castigated Nut (castle nut) –A nut with grooves cut entirely across the top face.
Casting –A part made by pouring molten metal into a mold.
Cathead –A collar or sleeve which fits loosely over a shaft to which it is clamped by setscrews.
Center –A point or axis around which anything revolves or rotates. In the lathe. one of the parts upon which the work to be turned is placed. The center in the headstock is referred to as the “live’ center and the one mounted in the tailstock as the ‘dead’ center.
Center, dead– A center that does not rotate; commonly found on the tailstock of a lathe. Also, an expression for the exact center of an object.
Center Drill– A combined countersink and drill used to prepare work for mounting centers.
Center Gage – A small ‘, flat gage having 60 degree angles that is used for grinding and setting the thread cutting tools in a lathe. It may also be used to check the pitch of threads and the points of center.
Center, half male– A dead center that has a portion of the 60 degree cone cut away.
Center Head– A part of a combination square set that is used to find the center of or to bisect a round or square workpiece.
Center, live– A center that revolves with the work. Generally. this is the headstock center; however, the ball bearing type tailstock center is also called a live center.
Center Punch – A pointed hand tool made of hardened steel and shaped somewhat like a pencil.
Ceramic– A new type of cutting tool material made of aluminum oxide . or silicon carbide that is finding increased use where high speed and resistance to high temperatures and wear are factors.
Chain Gearing (chain drive)– Power transmission by means of an endless chain running around chain wheels (chain pulley) and/or sprocket wheels.
Chamfer– The bevel or angular surface cut on the edge or a corner of a machined part.
Chasing Threads– Cutting threads in a lathe or screw machine.
Chatter– The vibrations caused between the work and the cutting tool which leave distinctive tool marks on the finished surface that are objectionable.
Chip Breaker– A small groove ground back of the cutting edge on the top of a cutting tool to keep the chips short.
Chipping –The process of cutting metal with a cold chisel and hammer.
Chisel – Any one of a variety of small hand cutting tools, generally wedge-shaped.
Chuck –A device on a machine tool to hold the workpiece or a cutting tool.
Circular Pitch– The distance measured on the pitch circle from a point on a gear tooth to the same point on the next gear tooth.
Clearance– The distance or angle by which one objector surface clears another.
Clearance Angle– The angle between the rear surface of a cutting tool and the surface of the work at the point of contact.
Climb Milling– A method of milling in which the work table moves in the same direction as the direction of rotation of the milling center. Sometimes called down cutting or down milling.
Clutch, friction (friction coupling)– A shaft coupling used where it is necessary to provide a connection that can be readily engaged or disengaged while one of the shafts is in motion.
Cog– A tooth in the rim of a wheel – a gear tooth in a gear wheel.
Cold-Rolled Steel– Steel that has been rolled to accurate size and smooth finish when made. In contrast, hot-rolled steel may have a rough, pitted surface and slag inclusion.
Collet– A precision work holding chuck which centers finished round stock automatically when tightened. Specialized collets are also a-, available in shapes for other than round stock.
Color Method– A technique of heat treating metal by observing the color changes that occur to determine the proper operation to perform to achieve the desired results.
Combination Square– A drafting and layout tool combining a square, a level. A protractor, and a center head.
Compound (rest)– The part of a lathe set on the carriage that carries the tool post and holder. It is designed to swing in any direction and to provide feed for turning short angles or tapers.
Concave– A curved depression in the surface of an object.
Concentric– Accurately centered or having a common center.
Cone Pulley– A one-piece stepped pulley having two or more diameters.
Contour– The outline of an object
Convex– The curved surface of a cylinder, as a sphere when viewed from without.
Coolant – A common term given to the numerous cutting fluids or compounds used with cutting tools to increase the tool life and to improve surface finish on the material.
Corrosion – Oxidation (rusting) or similar chemical change in metals.
Counterbore– To enlarge the top part of a hole to a specific size, as for the head of a socket-head or cap screw. Also, the tool that is used.
Countersink– To enlarge the top part of a hole at an angle for a flat-head screw. Also, the tool that is used.
Cross Feed –The feed that operates across the axis of the workpiece or at right angles to the main or principal feed on a machine.
Cross Section – A view showing an internal structure as it would be revealed by cutting through the piece in any plane.
Crucible Steel –A high-grade tool steel made by melting selected materials in a crucible.
Cutting Fluid – A liquid used to cool and lubricate the cutting to improve the work surface finish.
Cutting Speed– The surface speed of the workpiece in a lathe or a rotating cutter, commonly expressed in feet per minute (FPM) and converted to revolutions per minute (RPM) for proper setting on the machine.
Cutting Tool– A hardened piece of metal (tool steel) that is machined and ground so that it has the shape and cutting edges appropriate for the operation for which it is to be used.
Cyaniding –A process of case hardening steel by heating in molten cyanide.
Dead Smooth– The term applied to the finest cut of a file.
Deburr –To remove sharp edges.
Decalescence – A decrease in temperature that occurs while heating metal through a range in which change in structure occurs.
Dedendum –The depth, or that portion of a gear tooth from the pitch circle to root circle of gear.
Diametral Pitch – Ratio of the number of teeth on a gear to the number of inches of pitch diameter or the number of teeth to each inch of pitch diameter.
Die– A tool used to form or stamp out metal parts’, also, a tool used to cut external threads.
Die Stock – The frame and two handles (bars) which hold the dies (chasers) used for cutting (chasing) external screw threads.
Dividers, spring –Dividers whose legs are held together at the hinged end by the pressure of a C-shaped spring.
Dividing Head (index bead) – A machine tool holding fixture which positions the “,-work for accurately spacing holes. slots. flutes. and gear teeth and for making geometric shapes. When geared to the table lead screw, it can be used for helical milling operations.
Do-All Saw –A trade name given to a type of band saw used for sawing metal.
Dog – A clamping device (lathe dog) used to drive work being machined between centers. Also, a part projecting on the side of a machine worktable to trip the automatic feed mechanism off or to reverse the travel.
Dovetail– A two-part slide bearing assembly used in machine tool construction for the precise alignment and smooth operation of the movable components of the machine.
Dowel– A pin fitted or keyed in two adjacent parts to accurately align the parts when assembling them.
Down Feed (climb cutting, climb milling)– A seldom used method of feeding work into milling cutters. The work is fed in the same direction as the portion of the cutter which comes in contact with it.
Draw– See tempering.
Dressing– The act of removing the glaze and dulled abrasives from the face of a grinding wheel to make it clean and sharp. See truing.
Drift – A tapered. flat steel used to remove drills and other tapered shank tools from spindles, sockets, or sleeves. Also a round, tapered punch used to align or enlarge holes.
Drill– A pointed tool that is rotated to cut holes in material.
Drill Bushing – A hardened steel guide inserted in jigs, fixtures. or templates for the purpose of providing a guide for the drill in drilling holes in their proper or exact location.
Drill, center – A combination drill and countersink
Drill Chuck– A device used to grip drills and attach them to a rotating spindle.
Drill, Twist – A commonly used metal-cutting drill, usually made with two flutes running around the body.
Drill Jig –A jig which holds parts or units of a structure and. by means of bushings, guides the drill so that the holes are properly located.
Drill Press– An upright power-driven machine for drilling holes in metal, wood, or other material.
Drill Press, radial (radial drill)– A machine tool for drilling holes. The drill head is so supported that it may be moved over a large area to drill holes in objects of large size or to drill several holes in an object without shifting the object.
Drill Press – A drilling machine with a counterbalanced spindle which makes it possible for the operator to control accurately the rate at which the drill is fed into the work. The sensitive drill press usually contains drills that are less than 1/2 inch in diameter and which rotate at high speeds.
Drill Rod –A high-carbon steel rod accurately ground to size with a smooth finish. It is available in many sizes and is used extensively in tool making.
Drill Sleeve – An adapter with an internal and external taper which fits tapered shank tools such as drills or reamers to adapt them to a larger size machine spindle.
Drill Socket– An adapter similar to a sleeve except that it is made to adapt a larger tapered-shank tool to a smaller size spindle.
Drill, twist – A commonly used metal-cutting drill, usually made with two flutes running around the body
Drive Fit – One of several classes of fits in which parts are assembled by pressing or forcing one part into another.
Ductility– The property of a metal that permits it to be drawn. rolled, or hammered without fracturing or breaking.