JCE Metalwork flashcards
JCE Metalwork · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Ferrous metal
- A metal containing iron as its main constituent; it is magnetic and susceptible to rusting.
- Thermoplastic
- A plastic that softens when heated and can be reshaped repeatedly because its polymer chains are not cross-linked.
- Ductility
- The ability of a material to be drawn out into a thin wire without breaking.
- Hardness
- A material's resistance to indentation, scratching, or wear.
- Alloy
- A mixture of two or more metals, or a metal and a non-metal, to improve properties such as strength or corrosion resistance.
- Hacksaw blade pitch
- The number of teeth per inch on a hacksaw blade; 14 TPI is for thick sections and 24 TPI for thin sections.
- File card
- A wire brush used to clean metal filings from the teeth of a file and prevent clogging.
- Centre punch
- A hardened steel punch with a 90° point used to mark the centre of a hole before drilling.
- Scriber
- A sharp-pointed hardened steel tool used to scribe lines on metal surfaces.
- Bench vice jaw height
- The top of the vice jaws should be approximately at elbow height when standing for comfortable filing and sawing.
- Drill speed formula
- RPM = (cutting speed × 1000) / (π × drill diameter), with cutting speed in m/min and diameter in mm.
- Centre drill
- A short, rigid drill with a 60° countersink and pilot drill used to start holes accurately on a lathe.
- Climb milling
- A milling operation where the cutter rotation feeds the workpiece in the same direction as the feed.
- Chuck key
- A tool used to tighten or loosen a drill chuck; it must be removed before starting the machine.
- Brazing
- A joining process using a filler metal that melts above 450°C but below the melting point of the parent metal.
- Soft soldering
- Joining metals with a filler alloy that melts below 450°C, using flux to remove oxides.
- Rivet
- A permanent fastener with a head and a shank; the tail is deformed to clamp materials together.
- Clearance hole
- A hole slightly larger than the fastener diameter, allowing the bolt to pass through without threading.
- Tapping hole
- A hole drilled to a specific size so that a thread can be cut into it with a tap.
- Vernier caliper
- A measuring instrument with a main scale and sliding vernier scale, typically reading to 0.02 mm or 0.05 mm.
- Micrometer
- A precision measuring instrument using a screw thread, typically reading to 0.01 mm.
- Datum
- A reference point, line, or surface from which measurements are taken.
- Tolerance
- The total permissible variation in a dimension; for example, 25.00 ±0.05 mm gives a tolerance of 0.10 mm.
- Allowance
- The intentional difference between the sizes of mating parts, such as clearance or interference.
- First-angle projection
- A drawing convention where the view from the left is placed on the right and the view from above is placed below.
- Isometric drawing
- A pictorial drawing showing three faces of an object with vertical lines and 30° axes.
- Section view
- A drawing view showing internal features by cutting away part of the object, with hatching on cut surfaces.
- Title block
- A section on a drawing giving the part name, scale, material, date, and drawing number.
- Design brief
- A statement of the problem and constraints that a design must address.
- Ergonomics
- The study of how people interact with products, considering reach, grip, posture, and force.
- Risk assessment
- A process of identifying hazards, evaluating the risk, and recording control measures.
- Fire triangle
- The three elements needed for fire: heat, fuel, and oxygen; removing any one extinguishes the fire.