Mechanical drawing for industrial and high schools by Leeds Charles Carley 1870-

Author:Leeds, Charles Carley, 1870- [from old catalog]
Language: eng
Format: epub, pdf
Tags: Mechanical drawing
Publisher: New York, D. Van Nostrand company
Published: 1917-03-25T05:00:00+00:00

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LESSON No. 19.

PROJECTION.—In all of our previous lessons which dealt with the subject of projection, we have considered problems in which the planes were parallel to the surface projected.

The major portion of the drawings made in commercial drafting rooms are made after this fashion, at the same time there are many pieces of such shape that it is necessary to use planes which are placed at some other angle to the object than the conventional one.

It naturally follows that the student should be able to place a plane in any position in relation to an object, so that he may project a certain surface in such manner as to obtain the desired view.

While the plane may form any angle with the surfaces of the object, when the view is projected the projection lines must form right angles with the plane just as when the plane is placed in the conventional manner.

The piece used in the illustration is not of a type to need a special

angle plane, but this simple shape wUl serve very well to demonstrate the principle involved.

THE DRAWING.—On Drawing C-1012 is shown a partially finished problem in projection. View (a) is an end view of a rectangular block with all the dimensions shown; view (b) is a partially finished, foreshortened top and edge view, showing the length of the block.

View (a) is projected upon a plane which is set at an angle of 45°; this plane is then raised to a vertical position and swung around one-fourth turn or 90°, so as to show view {b).

View (c) should be an end view of the block tilted at an angle

of 45°-

Lay out the three views full-size, finishing them completely and placing them in the positions indicated on the drawing.

The student should note that the plane between view (6) and view (c) is parallel with the end of the block.

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