Manufacturing Engineering: Machining, Joining, and Finishing Processes

Vocabulary practice flashcards covering metal cutting, turning, milling, drilling, grinding, non-traditional machining, gear/thread making, welding, fastening, brazing, soldering, and metal finishing operations.

Machining

The process of removing unwanted material from a workpiece in the form of chips, commonly called metal cutting or metal removal when applied to metals.

Hacksaw Blade

A straight, relatively rigid cutting blade of limited length with teeth on one edge, used in a power hacksaw machine with a back-and-forth reciprocating motion.

Bandsaw Blade

A blade sufficiently flexible that a long length can be joined into a continuous loop band with teeth on one edge, producing continuous cutting action.

Circular Saw Blade

A rigid circular disk having cutting teeth along its periphery, used for sawing materials.

Shaping

A machining process where a reciprocating single-point tool moves along a straight line path across a stationary workpiece to generate a flat surface, typically for surfaces not exceeding $24'' \times 24''$.

Planing

A machining process used to produce flat surfaces on workpieces too large for shapers, in which the workpiece reciprocates past one or more stationary, single-point cutting tools.

Parting / Cutoff

A lathe operation that severs a section off the workpiece by plunging a narrow parting tool radially to slice a deep groove entirely through it.

Facing

A lathe operation that produces a flat surface at the end of a workpiece by feeding the cutting tool across the face, perpendicular to the axis of rotation.

Turning

The removal of metal from the outer diameter of a rotating cylindrical workpiece by moving the tool parallel to the axis of rotation to reduce part diameter.

Taper Turning

A turning operation that generates a conical surface through the gradual, linear reduction of diameter along the length of a cylindrical workpiece.

Form Turning

A lathe operation where a single straight plunge of a form tool matching the intended contour replicates its custom profile onto the workpiece.

Knurling

An operation performed on a lathe that produces a regularly shaped, roughened diamond or straight pattern on the workpiece surface for grip or aesthetics.

Lathe Centers

Support devices consisting of a live center (which rotates with the work) and a dead center (solid hardened steel) used to support long workpieces between the headstock and tailstock.

Three-jaw Self-Centering Chuck

A lathe chuck whose three jaws move radially inward or outward simultaneously to provide automatic centering for cylindrical or hexagonal stock.

Four-jaw Independent Chuck

A lathe chuck where each jaw adjusts independently, allowing the mounting and centering of irregular, non-symmetrical, or rectangular workpieces.

Collet

A slotted, tubular sleeve with a tapered head used to grip smooth cold-rolled, extruded, drill-rod, or previously machined bar stock with high accuracy.

Faceplate

A circular mounting plate attached to a lathe spindle, using clamps to hold irregularly shaped workpieces that cannot be held in chucks or collets.

Up Milling (Conventional Milling)

A milling method where the cutter rotates against the direction of table feed; chip thickness begins at zero and increases to a maximum, generating lifting forces on the workpiece.

Down Milling (Climb Milling)

A milling method where the cutter rotates in the same direction as the table feed; maximum chip thickness occurs at entry, pressing the work down into the table.

Vertical Milling Machine

A milling machine where the spindle axis is positioned vertically; built primarily for precision and detail work.

Horizontal Milling Machine

A milling machine featuring a horizontal spindle driven arbor, widely used for precision heavy material removal.

Slab Milling

A peripheral milling operation where the cutter width extends beyond the workpiece on both lateral ends to machine an entire flat horizontal surface.

Slot Milling

A peripheral milling process where the cutter width is narrower than the workpiece width, cutting a defined slot or channel into the stock.

Straddle Milling

A peripheral milling setup using two spaced cutters on an arbor to machine both opposing outer sides of a workpiece simultaneously.

Conventional Face Milling

A face milling process where the diameter of the cutter exceeds the width of the workpiece, entirely covering and machining the surface in one pass.

Pocket Milling

A milling operation where material located inside an arbitrary closed boundary on a flat workpiece surface is hollowed out to a fixed depth.

Surface Contouring

A milling operation where a ball-end mill is fed along a curvilinear path across a workpiece at close intervals to produce complex 3D contoured surfaces.

Drilling

A machining operation that produces internal cylindrical holes in solid material using a rotating cutting tool with two cutting edges, termed a twist drill.

Counterboring

A secondary hole-making operation that produces an enlarged cylindrical stepped recess with a flat bottom at the entry of a hole to seat bolt heads flush.

Countersinking

A secondary hole-making operation that creates a beveled or cone-shaped entry section at the opening of a hole to seat flat-head screws or rivets flush.

Spot Facing

A machining step that cleans up and flattens a localized rough surface around a hole to provide a smooth bearing surface normal to the hole axis.

Boring

The operation of enlarging and truing an existing drilled or cast hole using a single-point boring tool feeding axially inside the hole.

Reaming

A light finishing operation employing a multi-fluted tool (reamer) to slightly enlarge a pre-drilled or bored hole to achieve precise dimensions and high surface finish.

Broaching

A machining operation in which a multiple-toothed bar cutter with stepped cutting edges is pushed or pulled across or through a stationary workpiece to finish a surface in a single stroke.

Surface Grinding

An abrasive machining operation that produces flat, angular, or contoured surfaces by traversing a workpiece horizontally under a revolving grinding wheel.

Cylindrical Grinding

An abrasive finishing operation where a workpiece rotates on a fixed center while a grinding wheel machines external surfaces concentric to the rotational axis.

Internal Grinding

An abrasive process using a small high-speed grinding wheel to finish internal cylindrical surfaces of previously bored, drilled, or reamed holes.

Centerless Grinding

A high-production cylindrical grinding process where the workpiece rests on a work blade between a grinding wheel and a regulating drive wheel without mechanical centers.

Honing

A precision stock-removal finishing process that uses fine bonded abrasive stones undergoing combined rotation and reciprocation to finish internal bore surfaces.

Ultrasonic Machining (USM)

A non-thermal process that employs an ultrasonically vibrating tool to drive abrasive particles suspended in a slurry at high velocity against a workpiece surface.

Waterjet Cutting (WJC)

A hydrodynamic machining method that uses an ultra-high-pressure, high-velocity fluid jet to slit or slice materials without introducing thermal heat-affected zones.

Abrasive Jet Machining (AJM)

A machining method that removes material by impinging a focused, high-velocity stream of gas-propelled fine abrasive particles onto the workpiece.

Electrochemical Machining (ECM)

A non-traditional machining process that removes metal through controlled anodic dissolution using a conductive electrolyte pumped between a negative tool and positive workpiece.

Electrical Discharge Machining (EDM)

A thermal erosion process that removes metal through localized melting and vaporization induced by rapid, repetitive spark discharges across a dielectric fluid-filled gap.

Electron-Beam Machining (EBM)

A thermal machining method operated inside a vacuum chamber where high-velocity, focused streams of electrons convert kinetic energy into thermal energy to vaporize metal.

Laser-Beam Machining (LBM)

A non-contact process that converts optical light energy into intense thermal energy using a coherent, focused laser beam to melt, vaporize, or ablate material.

Plasma Arc Cutting (PAC)

A high-temperature thermal cutting process that uses an electric arc to create an ionized high-velocity plasma gas stream that melts and blows away conductive metal.

Machine Control Unit (MCU)

The microcomputer hardware in a numerical control (NC/CNC) setup that stores the programmed instructions and executes them into motion signals for the machine tool axes.

Thread Tapping

The cutting of internal screw threads in drilled holes using a multi-point threaded cutter termed a tap (typically available in taper, plug, and bottoming types).

Thread Milling

A machining method that generates internal or external threads via circular helical interpolation of a rotating multi-tooth milling cutter.

Thread Rolling

A chipless cold-forming process where threads are formed by squeezing and rolling a cylindrical blank between hardened dies, plastically displacing metal into threads.

Gear Shaping

A gear generating process using a reciprocating gear-shaped cutter that strokes vertically while rotating in synchronized conjugate roll with the gear blank.

Gear Hobbing

A continuous gear generation process in which teeth are progressively generated into a revolving blank by a fluted, worm-like rotating cutter called a hob.

Bead Welds

Surfacing fusion welds deposited directly onto a flat metal plate without edge preparation, typically used for joining thin sheets or applying hard-facing coatings.

Groove Welds

Fusion welds placed into prepared grooves or gaps between joint edges, utilized to ensure full-thickness joint strength on thicker materials.

Fillet Welds

Welds possessing a triangular cross section used to join components in tee, lap, and corner configurations without requiring special joint edge preparation.

Plug Welds

Welds deposited into drilled or punched holes through an overlapping workpiece to secure it to an underlying part, often serving as replacements for rivets or bolts.

Neutral Flame

An oxyfuel flame with an oxygen-to-fuel ratio between $1:1$ and $1.15:1$, producing minimal chemical reaction with heated metal and used for most general welding.

Oxidizing Flame

An oxyfuel flame possessing an excess oxygen-to-fuel ratio exceeding $1.15:1$, which burns hotter than a neutral flame and is used primarily when welding copper and copper alloys.

Carburizing Flame (Reducing Flame)

An oxyfuel flame produced with excess fuel gas that decomposes carbon and hydrogen, used when welding Monel, high-carbon steel, certain alloy steels, and hard-facing layers.

Shielded Metal Arc Welding (SMAW)

An arc welding process (stick welding) that uses an electric arc struck between a flux-covered consumable wire electrode and the workpiece pool, forming shielding gas and slag.

Resistance Spot Welding

A resistance welding method where overlapping sheets are clamped between two water-cooled copper electrodes and joined by resistance heat and force into a $1/16''$ to $1/2''$ weld nugget.

Resistance Seam Welding

A resistance welding variation that produces a continuous liquid-tight seam made of a series of overlapping spot welds using power-driven rotating wheel electrodes.

Resistance Projection Welding

A resistance welding process where pressure and current are localized at embossed dimples or projections pre-formed into the mating workpiece surface.

Integral Fasteners

Mechanical joining features formed directly from the component's parent material that interlock or interfere to assemble parts, such as lanced tabs or single-lock standing seams.

Discrete Fasteners

Independent, individual mechanical hardware items manufactured separately to join components, including bolts, nuts, screws, rivets, staples, and quick-release fasteners.

Brazing

A thermal joining method using a filler metal whose melting point is above $450^\circ\text{C}$ but below that of the base metals, bonding closely fitted joints via capillary action without melting the parent material.

Torch Brazing

A manual or automated brazing process where joint heat is applied externally using a gas-flame torch, such as an oxyacetylene or oxy-hydrogen torch.

Furnace Brazing

A batch brazing method where pre-assembled components with preplaced flux and filler metal are joined simultaneously inside a controlled-atmosphere or vacuum furnace.

Dip (Salt Bath) Brazing

A brazing method where preheated part assemblies are submerged into a bath of molten chemical salt maintained slightly above the filler metal's melting temperature.

Induction Brazing

A brazing technique that utilizes high-frequency alternating electromagnetic fields to induce eddy currents that heat electrically conductive workpieces.

Resistance Brazing

A brazing process that generates localized heat directly from the electrical resistance of the joint parts when clamped between electrodes carrying an electric current.

Soldering

A joining operation wherein a nonferrous filler metal with a melting point below $450^\circ\text{C}$ is distributed into narrow joints by capillary attraction, often using a soldering iron.

Blast Cleaning

A mechanical cleaning technique that propels high-velocity abrasive particles (such as steel grit, glass beads, or plastic pellets) against a workpiece surface using compressed air, water, or wheels.

Barrel Finishing (Tumbling)

A bulk surface-finishing operation where numerous small parts and abrasive media are tumbled inside a rotating polygonal barrel to remove burrs, scale, and sharp edges.

Vibratory Finishing

A mass-finishing process performed in an open tub or bowl where high-frequency oscillatory vibrations cause media and workpieces to rub against each other for deburring and cleaning.

Buffing

A polishing operation where workpieces are brought into contact with high-speed revolving cloth wheels charged with fine abrasive compounds to create a high-luster finish.

Electropolishing

An electrochemical deplating method using an electrolytic cell with the workpiece as the anode, which preferentially strips microscopic high spots to smooth and polish the surface.

Anodizing

An electrochemical conversion process applied to aluminum in an electrolytic bath that thickens its natural oxide layer, improving corrosion resistance, hardness, and dye absorption.

Electroless Plating

A chemical reduction plating technique that deposits a uniform metallic coating onto a catalytic substrate surface from an aqueous chemical bath without using an external electrical current.