UPMSP Intermediate Technical Drawing flashcards
UPMSP Intermediate Technical Drawing · 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.
- Representative Fraction (RF)
- The ratio of a drawing length to the corresponding actual length, expressed as a fraction such as 1/50. It defines the scale of the drawing and appears in the scale's title.
- Diagonal scale
- A scale that reads three successive units by dividing the first primary unit into ten parts and the scale height into ten parts, with diagonals giving the second decimal place.
- First-angle projection
- A projection in which the object lies between the observer and the plane of projection. The top view is placed below the front view and the left-side view on the right.
- Third-angle projection
- A projection in which the plane of projection lies between the observer and the object. The top view appears above the front view and the right-side view on the right.
- True length of inclined line
- The actual length of a line inclined to a reference plane, found by rotating its view parallel to the reference plane and projecting the new position onto the other view.
- Horizontal trace (HT)
- The point where a line or plane meets the horizontal plane, located in the top view on the line produced. It lies on XY when the line is parallel to HP.
- Section plane
- An imaginary cutting plane that passes through a solid to reveal its interior. The cut surface is hatched, and its true shape is found by projection parallel to the plane.
- Frustum
- The portion of a solid remaining between its base and a section plane parallel to that base, with the apex or top portion removed.
- Development of a surface
- The true shape of a surface laid out flat on a plane. It is exact only for developable surfaces such as prisms, cylinders, pyramids and cones.
- Method of triangulation
- A development technique for oblique or transition surfaces in which the surface is divided into small triangles and each triangle's sides are found in true length.
- Intersection curve
- The curve along which two solid surfaces meet. Its points are located by cutting both solids with auxiliary planes and finding common points on their surfaces.
- Isometric scale
- A scale giving isometric lengths, which are 0.816 times true lengths. It is constructed using a 45-degree line for true lengths and a 30-degree line for isometric lengths.
- Isometric ellipse axes
- For a circle of diameter D drawn isometrically, the major axis equals 1.22D and the minor axis equals 0.71D, with the major axis perpendicular to the third isometric axis.
- Cabinet oblique projection
- An oblique projection in which the front face is drawn true shape and the receding edges are drawn at an angle, usually 45 degrees, at half scale.
- Cavalier oblique projection
- An oblique projection in which the front face is drawn true shape and the receding edges are drawn at full scale, usually at 45 degrees to the horizontal.
- Non-isometric line
- A line in an isometric view that is not parallel to any of the three isometric axes. Its length cannot be scaled directly and must be found from end coordinates.
- Conventional thread representation
- A simplified drawing of a screw thread using a thick line for the crest and a thin line for the root, with the thin line omitted at about one quarter of internal threads.
- Sunk key
- A key seated half in the shaft and half in the hub to transmit torque. Common forms are rectangular, square and gib-head, with width about one quarter of shaft diameter.
- Cotter joint
- A joint in which a tapered cotter passes through slots in a socket and a rod end to lock them together, used for axial loads in tension or compression.
- Riveted lap joint
- A joint in which two plates overlap and are fastened by a row or rows of rivets. It is simpler than a butt joint but weaker in tension.
- Journal bearing
- A plain bearing in which a rotating shaft (the journal) turns inside a lubricated bush or housing, supporting radial load without rolling elements.
- Floor plan
- A horizontal section through a building taken about 1.2 m above floor level, showing walls, openings, doors, windows and room names to a stated scale.
- Reduced level mark
- A symbol on a building drawing, usually a downward triangle with a horizontal line, giving the height of a floor, plinth or roof above a datum in metres.
- Centre-line plan
- A foundation drawing showing the centre lines of all walls as dash-dot lines with the trench width marked on both sides, used to set out the building.
- Single-stroke italic lettering
- Standard drawing lettering of capital letters sloped at 75 degrees to the horizontal, with a height-to-width ratio of about 7 to 4 and even stroke spacing.
- Aligned dimensioning
- A dimensioning system in which figures are placed above the dimension line and read from the bottom or from the right-hand edge of the sheet.
- Extension line
- A thin line drawn from the feature being measured to the dimension line, starting clear of the outline and extending a few millimetres past the dimension line.
- Leader line
- A thin straight inclined line ending in an arrowhead or dot on a feature, used to attach a note or dimension where a dimension line will not fit.
- Circumradius of regular hexagon
- The distance from the centre to a corner of a regular hexagon, equal to the side length. The distance across flats equals the square root of three times this radius.
- Dividers
- A drawing instrument with two pointed legs used to transfer measurements and to step off equal distances along a line or around a circle.
- Standard drawing sheet A2
- An ISO A-series sheet measuring 420 mm by 594 mm, obtained by halving A1. A1, A2, A3 and A4 sheets are used on matching drawing boards.
- Compass
- A drawing instrument with one pointed leg and one leg holding a pencil or pen lead, used to draw circles and arcs of a set radius.