Page 1756 - All Industrial Tool Supply | General Catalog

Definitions
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gear blank-A stamping, casting or any index plate-A metal disk or plate punched lip of a drill-The sharp cutting edge on the nitrating-A case hardening process in
piece of material from which a gear is to be with many holes arranged in a series of end of a twist drill. which ammonia or some other form of
machined. rings, one outside, the other containing a loading-A condition caused by grinding the nitrogen is introduced to the surface of
gib-A tapered strip of metal placed between different number of holes. wrong material with a grinding wheel or certain alloys.
the bearing surface of two machine parts indicator-A high precision instrument using too heavy a grinding action. non-ferrous-Metal containing no iron,
to ensure a precision fit and provide an which shows variations of thousandths of machinability-The degree of difficulty with such as brass and aluminum.
adjustment for wear. an inch or less when testing the trueness which a metal potentially may be machined; normalizing-Process of heating a
half nut-A lever-operated mechanism that or alignment of a workpiece, fixture or may be found in appropriate handbooks. ferrous metal or alloy to above its critical
resembles a split nut that can be closed on machine. machine tool-A power-driven machine temperature and cooling in still air to room
the lead screw of a lathe when threads are jacobs chuck-Common term for the drill designed to bore, cut, drill, or grind metal or temperature to relieve internal stresses.
being cut. chuck used in either the headstock spindle other materials. off center-Not centered; offset, eccentric
handwheel-Adjusting or feeding or in the tailstock for holding straight-shank machining, finish-Machining a surface to or inaccurate.
mechanism shaped like a wheel and drills, taps, reamers, or small diameter give it the desired finish. oil hardening-The process of quenching
operated by hand. workpieces. machining, rough (rough finishing)- in oil when heat treating alloy steel to bring
hardening-A heat-treating process jarno-A standard taper having 0.600-inch Removing excess stock (material) with a out certain qualities.
for steel which increases its hardness taper per foot used on a variety of machine machine tool thus shaping it in preparation oilstones-Molded abrasives in various
and tensile strength and reduces its tools. for finish machining. shapes used to hand-sharpen cutting tools.
ductility. johannson blocks (Jo blocks)- magnesium-A lightweight, ductile overarm-The support for the end of a
headstock-The fixed or stationary end of a Common term for the precision gage metal similar to but lighter than milling cutter which is on the opposite side
lathe or similar machine tool. blocks used and accepted as dimensional aluminum. of the cutter from the spindle and column.
heat treatment-The process of heating standards by machinists, toolmakers and magnetic chuck-A flat smooth-surfaced pack hardening-A heat-treating process
and cooling a solid metal or alloy to inspectors. work holding device which operates in which the workpiece is packed into a
obtain certain desired properties or kerf-The width of cut made by a saw. by magnetism to hold ferrous metal metal box together with charcoal, charred
characteristics. key-One of the several types of small metal workpieces for grinding. leather or other carbonaceous material to
helical gear-A gear with teeth cut at some objects designed to fit mating slots in a malleable-Capable of being extended or case-harden the part.
angle other than at a right angle across the shaft and the hub of a gear or pulley to shaped by hammering or rolling. parallels-Hardened steel bars accurately
face of the gear, thus permitting more than provide a positive drive between them. Also mandrel-A precision-made tapered ground to size and ordinarily made in pairs
one tooth to be engaged at all times and the name of the T-handle wrench used on shaft to support work for machining in many different sizes to support work in
providing a smoother and quieter operation chucks. between centers. precision set-ups.
than the spur gear. key seat-A recessed groove (slot) machined mesh-To engage, as the teeth between two parting-The operation of cutting off a piece
helix-A path formed as a point advances into a shaft or a part going on the shaft gears. from a part held in the chuck of a lathe.
uniformly around a cylinder, as the thread (usually a wheel or gear). mic; mike-A term used for a micrometer or pawl-A pivoted lever or sliding bolt that
on a screw or the flutes on a drill. knee-That part of a column of a knee-type to measure with a micrometer. secures an automatic directional table
helix angle-The angle between the milling machine which carries the saddle micrometer, depth-A micrometer in control on a grinder.
direction of the threads around a screw and and the table and provides the machine which the spindle projects through a flat, peen-To draw, bend or flatten. Also the
a line running at a right angle to the shank. with vertical feed adjustments. Also, the accurately machined bar, used to measure formed side of a hammer opposite the face.
hex-Anything shaped like a hexagon. name of a precision angle plate called a the depth of holes or recesses. pilot-A guide at the end of a
high-speed steel-An alloy steel commonly ‘toolmaker's knee’. micrometer, thread-A micrometer in which counterbore which keeps it aligned with
used for cutting tools because of its ability knurl-A decorative gripping surface of the spindle is ground to a point having a the hole.
to remove metal at a much faster rate than straight-line or diagonal design made by conical angle of 60°. The anvil, instead of pilot hole-A starting hole for large drills to
carbon steel tools. uniformly serrated rolls called knurls. being flat has a 60° v-shaped groove which serve as a guide, reduce the resistance, and
hob-A cylindrical cutting tool shaped like a knurling-The process of finishing a part by fits the thread. aid in maintaining the accuracy of the larger
worm thread, used in industry to cut gears. scoring (also known as pressing) patterns mild steel-A term used for low-carbon hole. Also called a lead hole.
hobbing-cutting gears with a hob. on the surface of the work. machine steel. pinning-A term used to describe the
hog-To remove in excess of what is land-That surface on the periphery of a mill-A milling machine; the act of condition of a file clogged with metal filings
considered normal, sometimes causing rotary cutting tool, such as a milling cutter, performing an operation on the milling causing it to scratch the work.
accidents or tool breakage; also, to rough drill tap, or reamer, which joins the face machine. pitch-The distance from any point on a
out haphazardly. of the flute or tooth to make up the basic milling cutter-A cutting tool, generally thread to the corresponding point on the
hole saw-A cutting tool used to cut a cutting edge. cylindrical in shape. used on a milling adjacent thread. measured parallel to
circular groove into solid material. lap-A tool made of soft metal and charged machine and operated essentially like a the axis. Also applied to spur gears see
honing-The process of finishing ground with fine abrasives for precision finishing circular saw. diametral pitch.
surfaces to a high degree of accuracy and of metal surfaces. To perform the operation minor diameter-The smallest diameter pitch circle-The line (circle) of contact
smoothness with abrasive blocks applied to using a lap. of a screw thread. Also known as the ‘root between two meshing gears.
the surface under a very light controlled lard oil-A cutting oil made from animal fats diameter’. pitch diameter-The diameter of a thread
pressure and with a combination of rotary usually mixed with mineral oils to reduce its morse taper-A self-holding standard taper at an imaginary point where the width of
and reciprocating motions. cost and improve its qualities. largely used on small cutting tools such as the groove and the thread are equal.
hot-rolled steel-Steel which is rolled to layout-To locate and scribe on blank stock drills, end mills and reamers and on some pitch line-An imaginary line which passes
finished size while hot. Identified by a dark the shape and size dimensions required to machines, spindles in which these tools through threads at such points that the
oxide scale left on the surface. machine or form the part. are used. length of the part of the line between
idler-A gear or gears placed between two lead-The distance a thread will advance multiple-thread screw-A screw made of adjacent threads is equal to the length of
other gears to transfer motion from one along its axis in one complete revolution. two or more threads to provide an increased the line within a thread.
gear to the other gear without changing Also, a heavy, soft, malleable metal having lead with a specified pitch. plain cutter-A milling cutter with cutting
their speed or ratio. a low melting point. It has a bright silvery music wire-A high-quality steel wire teeth on the periphery (circumference) only.
independent chuck-A chuck in which color when freshly cut or poured and turns used for making springs. Also called piano play-The looseness of fit (slack) between
each jaw may be moved independently of to a dull gray with aging. wire. two pieces.
the others. lead screw-The long, precision screw necking-Machining a groove or undercut punch, prick-A solid punch with a sharp
indexing-The process of positioning a located in front of the lathe bed geared to in a shaft to permit mating parts to be point, used to mark centers or other
workpiece for machining it into equal the spindle and used for cutting threads. screwed tightly against a shoulder or to locations on metal.
spaces, dimensions or angles using an Also, the table screw on the universal provide clearance for the edge of a grinding pyrometer-A device for measuring the high
index or dividing head. milling machine when geared to the wheel. temperatures in a heat-treating furnace.
indexing fixture-A complete indexing unit indexing head for helical milling. nickel-An alloying element which increases quench-To rapidly cool heated metal in
composed of a dividing head and rootstock. limits-The smallest and largest dimension the strength, toughness, and wear and water, oil brine or air in the process of
( dividing head.) which are tolerable. corrosion resistance of steels. heat treating.