Mechanical Drawing: Instruction PaperAmerican School of Correspondence, 1906 |
Άλλες εκδόσεις - Προβολή όλων
Mechanical Drawing, Τεύχη 1-14 Tom C. Plumridge,James M'Kinney,Ervin Kenison Προβολή αποσπασμάτων - 1935 |
Συχνά εμφανιζόμενοι όροι και φράσεις
ABC and CEF angle arrow arrowheads assembly drawing blue print CAST IRON chamfer coating construction line contour lines conventional crosshatching detail drawing Diameter of Bolt dimension line Draw the arcs edges elevation end view equal exact drawing extension lines figure finished given head or nut heavy lines HERBERT CHANDLER CHICAGO hexagonal head hexagonal prism horizontal center line indicated left-hand length lighter lines lines slant lines which represent looking machine MECHANICAL DRAWING methods number of threads one-fourth one-half orthographic projection ounces parallel dotted lines pencil drawing Pipe Coupling placed plan view points projections radius rectangular piece repre represent the thread right-handed thread sacrificing clearness scale SCREW THREADS shade lines shown in Fig side view sketches square STANDARD Franklin Institute standard sizes student surface T-square tangent taper taps and dies threaded hole threads per inch top view tracing cloth U. S. STANDARD Franklin various pieces Width of Head WROUGHT IRON
Δημοφιλή αποσπάσματα
Σελίδα 36 - These frames are made in many styles, some simple, some elaborate. A simple and efficient form is a flat surface usually of wood, covered with padding of soft material, such as felting. To this is hinged the cover, which consists of a frame similar to a picture frame, in which is set a piece of clear glass. The whole is either mounted on a track or on some sort of a swinging arm, so that it may readily be run in and out of a window. The print is made on paper prepared for the purpose by having one...
Σελίδα 36 - After a little practice, however, he will find that the tracing cloth is very satisfactory and that a good drawing can be made on it quite as easily as on paper. The necessity for making erasures should be avoided, as far as possible, but when an erasure must be made a good ink rubber or typewriter eraser may be used. If the...
Σελίδα 35 - In some offices the pencil drawing is made on a thin, tough paper, called board paper, and the ink:ng is done over the pencil drawing, in the manner with which the student is already familiar. It is more common to do the inking on thin, transparent cloth, called tracing cloth, which is prepared for the purpose. This tracing cloth is made of various kinds, the kind in ordinary use being what is known as "dull back," that is, one side is finished and the other side is left dull.
Σελίδα 35 - ... so that it will be difficult to complete the views and make the new lines fit those already drawn and at the same time conform to the pencil lines underneath. For this reason it is well, when possible, to complete a view before leaving the drawing for any length of time, although of course on views in which there is a good deal of work this cannot always be done. In this case the draftsman must manipulate his tracing cloth and instruments to make the lines fit as best he can. A skillful draftsman...
Σελίδα 8 - It should be borne in mind that ordinarily in making a crosssection we show not only those parts of the object which lie in the plane in which it is supposed to be cut, but also all which lie back of that plane. Sometimes it is desirable to show the inside and the outside of a piece on the same view. Fig. 10 shows the same piece as in Fig. 8, but in Fig 10 the left-hand half of the lower view is an elevation and the right-hand half is a cross-section, the section and the elevation each extending...
Σελίδα 31 - In the same way, if he wishes to make his drawing one-twelfth size he finds on his scale one inch divided into twelfths and fractions of twelfths and uses this as his standard of measurement; if he wishes to make his drawing one fortyeighth size he uses a quarter inch with its subdivisions. Sometimes if the piece to be drawn is very small, the drawing is made at an enlarged scale, such as twice size, three times size, etc. The mistake of choosing the wrong distance to use on a scale is often made....
Σελίδα 33 - All sketches should be made large to avoid confusion. Detail Drawing. After the sketches are made, the next step is the making of the pencil drawing from the sketches, accurately to scale. The size of the plate on which the drawing is to be made is usually fixed by some standard. 'Where many drawings are made and kept in an office, it is desirable to keep the plates of uniform size, as far as possible. It is good practice to have two or three standard sizes of plates, one for small drawings, one...
Σελίδα 26 - CC equal to the distance LL from NN and draw the arcs tangent to this line with radius B equal to one-half of A. The lines EF are then drawn as explained for Fig. 41. Referring again to Fig. 35, the dimension which shows the length of the bolt under the head should...
Σελίδα 7 - ... and the view of the left-hand side on the left. From now on, in our work on drawing, we shall follow this rule. Cross-sections. Very often it occurs that a piece is hollow and the inside construction is more or less complicated, so that if in the drawing the outside view is shown, with the invisible interior drawn in dotted lines, the latter are so confused that the drawing is not easily understood.
Σελίδα 36 - All moisture should be kept from the cloth. Blue Printing. The tracing, of course, cannot be sent into the shop for the workmen to use, as it would soon become soiled and in time destroyed, so that it is necessary to have some cheap and rapid means of making copies from it. These copies are made by the process of blue printing in which the tracing is used in a manner similar to the use made of a negative in photography. Almost all drafting rooms have a frame for the purpose of making blue prints....