Page 1757 - All Industrial Tool Supply | General Catalog

Definitions
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quick return-Mechanism on some machine shims-Very thin sheets of metal made in stop-A device attached to a machine tool thread root-The bottom surface joining the
tools that provides rapid movement of the precise thickness and used between parts to limit the travel of the worktable and sides of two adjacent threads.
ram or table on the return or anointing to obtain desired fits. Sometimes they are sometimes the work head. throw-The crankpin on a crankshaft. Also,
stroke of the machine. laminated, to be pulled off to the desired straddle milling-A milling setup where the length of the radius of a crank, eccentric
rack-Array of gears spaced on a straight depth. two side milling cutters are spaced on an or a cam.
bar. shoulder-A term for the step made arbor to machine two parallel surfaces with tolerance-The allowable deviation from a
radial-In a direction directly outward from between two machined surfaces. a single cut. standard size.
the center of a circle or sphere or from the shrink fit-A class of fit made when the stress-The internal force or resistance tool steel-A general classification for
axis of a cylinder. outer member is expanded by heating to fit developed in steel which was hardened, high-carbon steel that can be heat treated
radius-Distance from the center of a circle over a shaft, and then contracts or shrinks extensively machined or cold worked. to a hardness required for metal cutting
to its circumference (the outside edge). tightly to the shaft when cooled. surface grinding-The process of grinding tools such as punches, dies, drills, taps,
rake-That surface of a cutting tool side cutter-A milling cutter that has cutting flat surfaces on a surface grinding machine. reamers.
against which the chips bear while being teeth on the side as well as on the periphery With special setups, angular and form traverse-One movement across the surface
severed. If this surface is less than 90° from or circumference. surfaces may also be ground. of the work being machined.
the surface being cut, the rake is positive if side rake-Surface which slopes to the surface plate-An accurately machined and truing-The act of centering or aligning
more, the rake is negative. side of cutting edge. It may be positive or scraped flat metal piece (usually of cast a workpiece or cutting tool so that an
ram-That part of a shaper which moves negative & is combined with the back rake. iron) used to check the flatness of surfaces. operation may be performed accurately,
back and forth and carries the tool head See rake. swing-The dimension of a lathe correcting the eccentricity or out of round
assembly. sine bar-A precision instrument for laying determined by the maximum diameter of condition when dressing a grinding wheel.
rapid traverse-A lever-controlled, power- out, setting, testing and otherwise dealing the work that can be rotated over the ways T-slot-The slots made in the tables of
operated feature of machines that permits with angular work. of the bed. machine tools for the square-head bolts
rapid movement of the worktable from one slabbing cutter-Wide, plain milling cutter tailstock-That part of a machine tool such used to clamp the workpiece, hh
position to another. having helical teeth. Used for producing as a lathe or cylindrical grinder which attachments or workholding fixtures in
reaming, line-Process of reaming two or large, flat surfaces. supports the end of a workpiece with a position for performing the machining
more holes to bring them into very accurate, slitting saw-A narrow milling cutter center. It may be positioned at any point operations.
precise alignment. designed for cutoff operations or for cutting along the way of the bed and may be offset tumbler gears-A pair of small lever-
recalescence-An increase of temperature narrow slots. from center to machine tapers. mounted gears on a lathe used to engage or
that occurs while cooling metal through slotter-An attachment which operates with tang-The flat on the shank of a cutting tool, to change the direction of the lead screw.
a range of temperatures in which metal a reciprocating motion. Used for machining such as a drill, reamer or end mill, that fits a two-lip end mill-An end milling cutter
change. internal slots and other surfaces. slot in the spindle of a machine to keep the designed with teeth that cut to the center
relief-A term for clearance or clearance soft hammer-A hammer made of brass, tool from slipping. Also, the part of a file that so that it may be used to feed into the work
angle. copper, lead or plastic to a non-marring fits into a handle. like a drill.
roughing-The fast removal of stock finished surface. tap-A tool used to cut threads on the inside universal grinder-Grinding machine
to reduce a workpiece to approximate spherodizing-A process of heat treating of a round hole. designed to perform both internal and
dimensions, leaving only enough material to steel to produce a grain structure that is taper-A uniform increase or decrease in the external grinding operations including
finish the part to specifications. relatively soft and machinable. size or diameter of a workpiece. straight and tapered surfaces on tools
running fit-A class of fit intended for use spindle-A rotating device widely used tapping-Cutting screw threads in a round and cutters.
on machinery with moderate speeds, where in machine tools such as lathes, milling hole with a tap (an internal thread cutting universal milling machine-A milling
accurate location & minimum play are machines, drill presses and so forth, to hold tool). machine with a worktable that can be
desired. the cutting tools or the work, and to give T-bolt-Term for the bolts inserted in swiveled for milling helical work. Always
SAE steel-Steel manufactured under the them their rotation. the T-slots of a worktable to fasten the supplied with attachments, including an
specifications by the Society of Automotive spindle speed-The RPM at which a workpiece or work-holding device to the indexing fixture.
Engineers. machine is set. spot facing-Finishing a table. universal vise-Designed for holding work
sandblasting-A process of blowing bearing surface around the top of a hole. tempering-A heat-treating process used at a double or compound angle. Also, a
sand by compressed air with considerable spring collet-See collet. to relieve the stresses produced when toolmaker's vise.
force through a hose against an object. spur gear-A gear having teeth parallel to hardening and to impart certain qualities, ways-The flat or V-shaped bearing surfaces
scale-The rough surface on hot finished the axis of the shaft on which it is mounted. such as toughness sometimes called on a machining tool that guide and align the
steel and castings. Also, a shop term for square, solid (toolmaker's tri-square)-A drawing. parts which they support.
steel rules. very accurate try square in which a steel template-A guide for laying out or wheel dresser-A tool or device for dressing
scraper-A hardened steel hand tool used to blade is set firmly into a solid, rectangular- machining to a specific shape or form. or truing a grinding wheel.
scrape surfaces very smooth by removing shaped handle so that each edge of the tensile strength-The property of a work-Workpiece or part being machined.
minute amounts of metal. blade makes an angle of exactly 90° with metal which resists force applied to pull it working drawing-A drawing, blueprint
scribe (scribe; scratch awl)-A steel rod 8 the inner face of the handle. apart. or sketch of a part, structure, or machine.
to 12" long and about 3/16" in diameter. It square surface-A surface at a right angle thread-A helical projection of uniform worm-The threaded cylinder or shaft
has a long, slender, hardened steel point on with another surface. section on the internal or external designed to mesh with a worm gear.
one or both ends. square threads-A thread having a depth. surface of cylinder or cone. Cutting a worm gear-A gear with helical teeth made
sector-A device that has two radial, beveled width and space between threads that are screw thread. to conform with the thread of mating worm.
arms which can be set to include any equal. It is used on heavy jack screws, vise thread angle-The angle formed by the two wrought iron-A commercially pure form
number of holes on the indexing plate of a screws and other similar items. sides of the thread (or their projections) of iron with minute slag inclusions which
dividing head to eliminate recounting the steady rest-A support that is clamped to with each other. make it soft, tough & malleable.
holes for each setting. the bed of a lathe used when machining a thread axis-A line running lengthwise zinc- A bluish white ductile metal used to
set-The bend or offset of a saw tooth to long workpiece. They are sometimes called through the center of the screw. make hard varieties of aluminium and light,
provide a clearance for the blade while a center rest. thread crest-The top surface joining the strong zinc casting alloys.
cutting. Also, the permanent change in the stellite-A cast alloy of chromium, cobalt two sides of a thread.
form of metal as the result of repeated or and sometimes tungsten, used to make thread depth-The distance between the
excessive strain. lathe cutter bits that will stand exceptionally crest and the root of a thread.
set screw-A plain screw used principally fast speeds and heavy cuts. thread pitch-The distance from a point on
for locking adjustable parts into a fixed step block-A fixture designed like a series one screw thread to a corresponding point
position. step to provide support at various heights on the next thread.
shank-That part of a tool or similar object required for set-ups. thread pitch diameter-The diameter of
which connects the principal operating part stock-A term for the materials used to a screw thread measured from the thread
to the handle, socket or chuck by which it is make parts in a machine tool. Also, the die pitch line on one side to the thread pitch
held or moved. stock used for threading dies. line on the opposite side.