General DraftingU.S. Government Printing Office, 1972 |
Common terms and phrases
AGO 19A alined angle arc intersecting Architect's scale auxiliary view axes axis base baseline beam compass Bisecting blueprint centerline chart circle color compass and straightedge cone construction coordinates cutting plane cylinder diameter diazo dimension lines distance divide drafting draftsman Draw line Drawing a line Drawing an arc drawn edge ellipse engineer's scale eraser extension lines freehand front view frustrum generatrix geometric given line given one side given point graph graphic grid guidelines height hexagon hidden lines holes horizontal hyperbola hypotenuse inch isometric drawing isometric projection Knurls lettering line weight locate points method nibs number of equal object orthographic parabola parallel pencil perpendicular pictorial point of tangency position prints prism radius reference line regular polygon ruling pen scale shading shape sheet sketch space square straight line strokes T-square and triangle tailpin tangent arc template tion title block top view tracing paper true length vertical width
Popular passages
Page 6-40 - Cycloid. The cycloid is a curve generated by a point on the circumference of a circle which rolls on a straight line tangent to the circle.
Page 6-34 - An ellipse (Fig. 48), is a curve formed by a point moving so that the sum of its distances from two fixed points is a constant.
Page 2-16 - Drawing pencils are furnished in the following seventeen grades: 6B, 5B, 4B, 3B, 2B, B, HB, F, H, 2H, 3H, 4H, 5H, 6H, 7H, 8H and 9H.
Page 6-3 - If the hypotenuse has measure c and the legs have measures a and b, the relationship among the measures, known as the Pythagorean Theorem, is given by c2 = a2 + b2.
Page 10-1 - ... used to establish datum points, lines, planes, or areas for special function, or manufacturing and inspection repeatability. Dimension — A dimension is a numerical value expressed in appropriate units of measure and indicated on a drawing. Feature — Features are specific component portions of a part and may include one or more surfaces such as holes, screw threads, profiles, faces, or slots. Features may be "individual
Page 3-2 - VERTICAL line should always begin with a dash in contact with the line from which it starts, except when the dash would form a continuation of a full line. Dashes should touch at corners.
Page 7-1 - Any position of the generatrix is called an element of the surface. This surface has a second rectilinear generation in which any two rectilinear elements of the first generation may be taken as directrices and a plane which is parallel to the first directrices as a plane directer.
Page 7-6 - A surface generated by a straight line moving so that it always remains parallel to a plane director and at the same time touches two plane curves, not lying in the same plane, is called a cylindroid. These curves are usually parts of circles or ellipses. Construction. Since this problem is more frequently encountered in arch construction where the plane director is likely to be the horizontal plane, it is so illustrated here. However, it should be clear that...
Page 7-11 - From the time men had ceased to believe in the flatness of the earth, and had begun to regard it as a sphere, their investigations had been directed toward its size alone; now, however, the inquiry assumed a new phase, and its shape came up again for discussion.
Page 9-9 - C' and AFCf' will be the oblique projection of AB. 6.19. TO MAKE AN OBLIQUE DRAWING. Oblique drawing is similar to isometric drawing in that it has three axes that represent three mutually perpendicular edges and upon which measurements can be made. Two of the axes are always at right angles to each other, as they are in a plane parallel to the picture plane. The third, or depth, axis may be at any angle to the horizontal, 30° or 45° being generally used (Fig.