Sheet Metal Drafting, Prepared in the Extension Division of the University ... by Ellsworth M . Longfield

Author:Ellsworth M . Longfield
Language: eng
Format: epub
Publisher: McGraw-Hill book company, inc.
Published: 1921-03-25T05:00:00+00:00

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Objectives of Problems on Sections Formed by Cutting Planes.

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Problem 29

SPRINKLING CAN

55. The Sprinkling Can. —Figure 164 represents a section of a sprinkling can with the names of the various parts. Special attention should be given to the methods of assembly.

An elevation, Fig. 165, should be drawn according to the dimensions given in Fig. 164.

The Spoid. —The sides of the spout. Fig.. 165, should be carried upwards until they meet at the apex. The top side of the spout, Fig. 165, is extended into the elevation so that the distance from the apex to point 1 will be equal to the distance from the apex to point 5. The straight line 1-5 is drawn to serve as the base of the cone. A half-profile of the cone (spout) is drawn and divided into four equal spaces. Extension Unes are carried from each division, meeting the base line at right angles. From the intersections of the base lines, extension lines are carried to the apex of the cone. The profile of the body of the sprinkling can. Fig. 166, is drawn next. The horizontal center line is extended to the right of the profile indefinitely. An extension Une is dropped from the apex of Fig. 165 until it intersects the horizontal center line of Fig. 166. This will locate the apex of Fig. 166. Extension Unes are dropped from the base of the cone (spout) in Fig. 165 until they intersect the horizontal center line of Fig. 166. These intersections should be numbered 1, 2, 3, 4, and. 5 to correspond to the half-profile. The distances a, fe, and c taken from corresponding lines in the half-profile of Fig. 165 are set off upon these extension lines. Lines are drawn from each of these points to the apex of Fig. 166. These lines intersect the profile of the body at three different points D, Ef and F. Extension lines should be carried upward until D intersects the line from 2, F intersects the line from 3, and E intersects the line from 4. A curved line passing through these points will give the developed miter line between the body and the spout.

With a radius equal to the distance from the apex to point 5, Fig. 165, and with the apex as a center, the arc of stretchout. Fig. 167, is drawn. Twice as many spaces as there are in the half-profile of the spout are set off upon this arc. Lines from each of these points should be drawn to the apex. Straight lines are drawn

parallel to the base line 1-5 across the elevation of the cone, Fig. 165, from each intersection of the developed miter line. These lines intersect the side or slant he^t of the cone at five different points. With the apex as a center, arcs are carried from each of these points over into the stretchout.

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