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Drafting Certification


Credential: Certificate

The purpose of our Drafting Certificate program is to provide more than basic Architectural and Mechanical Drafting Skills. Our students will receive the skills to create complete Residential Construction, Survey, and Mechanical / Machine drawings. Subjects include drafting practices, and CAD software. Students are taught by a professional General Draftsman who has over 39 years drafting experience.


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Working Drawings

A working drawing of a piece of machinery is a group of correctly and completely dimensioned orthographic views of that particular object which will give all the information necessary in constructing an actual duplicate of the drawing. Fig. 1.


Fig. 1

Detail Drawings

A detail drawing is a working drawing of one piece of any machine or a group of detail drawings of all of the parts of a machine or any collection of parts is termed a set of details.

Assembly Drawing

An assembly drawing of a machine is a one, two or three view orthographic projection of a machine completely assembled; i. e., all parts in their proper working place. Figs. 2a & 2b.


Fig. 2a


Fig. 2b


Assembly drawings have three important uses. (1) As an index to a working drawing; i. e., an assembly of a machine is ordinarily given with the set of detail working drawings to explain the use of each of these details in the machine; (2) For purposes of advertisement or magazine illustration; (3) As a construction guide in assembling machines which may be sent out from shops in sections.

Characteristics. Some characteristics which may be noted of assembly drawings when used for any of the above purposes are: (a) All dimensions are ordinarily omitted; (b) The several views are elaborately sectioned to explain clearly all inside constructions; (c) When given with a set of details the assembly will ordinarily occupy a fixed relative place on the sheet, i. e., the lower left corner or whole left side if necessary.

Detail Working Drawings

Arrangement of a set of details. In making a set of details a certain order of arrangement should be followed, both for appearances and ease in reading the drawing. As mentioned under assembly drawings, the assembly should occupy the left portion of the sheet. In general, the arrangement of the details on the sheet should be such as to suggest their direct relation in the machine itself; i. e.. such an arrangement as is suggested by the relation of these parts in the assembly. It may not always be possible to carry out this scheme completely; however, in general it will be found possible so to arrange the main details. For further explanation see Fig. 3. The assembly is here shown to the left, followed along the bottom of the sheet by the Fig-4 main detail, the remaining details being arranged about the sheet properly with relation to each other if not to the main details. Fig. 3a shows an arrangement with the assembly omitted.


Fig. 3


Fig. 3a


Fig 4

Order of work in a set of details. In making a set of details, e. g., of the bell crank, Fig. 4, the following order of work will be found to lend to the greatest speed: (a) Make list of details to be drawn and number of views required of each. (b) Select scale- (c) Draw on pieces of scrap paper rectangles or rectangular figures of the proper size to enclose the desired number of views of each detail- (d) Cut out these rectangles and arrange them on the sheet of drawing paper on which the details are to be drawn, (e) After the rectangles are arranged mark their positions, Fig. 5. (f) Divide the rectangles on the sheet of drawing paper into smaller rectangles to contain the separate views of each detail, Fig. 6. The rectangles mentioned in (e) and (f) should, of course, be put in only lightly and may be erased when no longer needed. Fig. 7.


Fig. 5


Fig. 6


Fig. 7

Detail signature. Accompanying each detail drawing, whether the detail drawing be by itself or one of a set, should be given a characteristic signature containing the following information: Name of the machine part, material of which it is made, number of parts required, and some arbitrary number for the pattern if the object is to be cast. This information should be given in the manner shown above.

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