Cyclopedia of Modern Shop Practice: A Manual of Shop Practice, Pattern Making, Machine Design...etc, Volume 4

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American technical society, 1906 - Machine-shop practice
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Page 539 - In the following pages are given a large number of test questions and problems which afford a valuable means of testing the reader's knowledge of the subjects treated. They will be found excellent practice for those preparing for College, Civil Service, or Engineer's License. In some cases numerical answers are given as a further aid in this work. REVIEW QUESTIONS ON THH SUnjEOT OB1 HEAT.
Page 322 - To obtain these light lines a hard lead pencil must be used. Lead pencils are graded according to their hardness, and are numbered by using the letter H. In general a lead pencil of 5H (or HHHHH) or 6H should be used. A softer pencil, 4H, is better for making letters, figures and points. A hard lead pencil should be sharpened as shown in Fig. 1. The wood is cut away so that about | or | inch of lead projects. The lead can then be sharpened to a chisel edge by rubbing it against a bit of sand paper...
Page 359 - We are able to draw the plan at once, because the width will be 1| inches, and the top edge will be projected half way between the other two. The length of the prism will also be shown. Before we can draw the elevation, we must find the height of the top edge. This height, however, must be equal to the altitude of the triangle forming the end of the prism. All that is necessary, then, is to construct an equilateral triangle 1|" on each side, and measure its altitude.
Page 358 - The prism has been turned as if on the line lh 1 as an axis, so that the inclination of all the faces of the prism to the vertical plane remains the same as before. That is, if in the first figure the side ABCD makes an angle of 30 with the vertical, the same side in the second position still makes 30 with the verFig.
Page 408 - ... tracing laid over it right side up, and the glass pressed down firmly and fastened in place. Springs are frequently used to keep the paper, tracing, etc., against the glass With some frames it is more convenient to turn them over and remove the backs. In such cases the tracing is laid against the glass, face down; the coated paper is then placed on it with the coated side against the tracing cloth. The sun is allowed to shine upon the drawing for a few minutes, then the blue-print paper is taken...
Page 320 - The usual method of fastening paper to a drawing board is by means of thumb tacks or small one-ounce copper or iron tacks. In fastening the paper by this method first fasten the upper left hand corner and then the lower right pulling the paper taut. The other two...
Page 323 - It gets its name from the general shape. T-squares are made of various materials, wood being the most commonly used. Fig. 4 shows an ordinary form of T-square which is adapted to most work. In Fig. 5 is shown a T-square with edges made of ebony or mahogany, as these woods are much harder than pear wood or maple, which is generally used. The head is formed so as to fit against the lefthand edge of the drawing board, while the blade extends over the surface. It is desirable to have the blade of the...
Page 320 - The other two corners are then fastened, and sufficient number of tacks are placed along the edges to make the paper lie smoothly. For very ,fine work the paper is usually stretched and glued to the board. To do this the edges of the paper are first turned up all the way round, the margin being at least one inch. The whole surface of the paper included between these turned up edges is then moistened by means of a sponge or soft cloth and paste or glue is spread on the turned up edges. After removing...
Page 461 - Packing | inch square will do for this size of piston rod, hence the faces of the yoke are easily determined, and its detail, with the stuffing boxes, proceeded with as on Plate L. The length of yoke may be brought to an even figure ; and proceeding on the above plan the length can be conveniently made in even inches without any fractions ; viz., 28 inches.
Page 286 - E1, as shown by similar numbers 3 to 1 to 3 to 1 to 3 on the stretchout line F G. From these points, at right angles to GF, draw lines, and intersect them by lines drawn parallel to the cylinder B from similar numbers in the joint line. Trace a line through these points in the development...

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