Triangulation applied to sheet metal pattern cutting; a comprehensive treatise for cutters, draftsmen, foremen and students; progressing from the simplest phases of the subject to by Kidder F. S. (Fred SMith) b. 1863

Author:Kidder, F. S. (Fred SMith), b. 1863
Language: eng
Format: epub
Tags: Sheet-metal work
Publisher: New York, The Sheet metal publication company
Published: 1917-03-25T05:00:00+00:00

Fig. 67. Side Elevations of Tapering Elbows,

form when viewed from the side, and allows the ends to be comparatively straight for connecting. There is, of course, some slight distortion in these pieces, which is

the outcome of making both ends round when not parallel.

Assuming that each piece in the elbows whose elevations are shown in Fig. 67 is to be round at each end, and of diameters equal to the lengths of lines which represent those ends in elevation, we have an exact counterpart of the ship's ventilator when a formula is supplied for a side elevation of that object. To secure the pattern we may proceed in precisely the same manner as has been explained for the ship's ventilator. . In discussing this matter with a man familiar with this class of work, the question was raised: "What shall we do if it is required to make the elbow straight on one side?" The reply was: "If you wish to secure the pattern for an elbow of this class when the ends are what you call 'off center' construct your plans accordingly. This will demand a full plan for each piece, as one-half is not a duplicate of the other. Therefore the complete pattern for each piece must be developed."

To Draw the Plan When the Elbow is to be

Straight on One Side.

Fig. 68 is shown in an endeavor to illustrate methods which may be employed to draw the plan when a fitting of this class is required, which is commonly known as "straight on one side." It is, in fact, presumed to represent the piece marked A in the elevation for the ship's ventilator, if it was required to make that piece straight on the side furthest from the eye, and with the form and diameter of the ends remaining the same. As will be noted, the elevation is substantially the same as shown in Fig. 65, Chapter XVI.

For the plan a circle is drawn equal in diameter to the length of the base line and in a position as indicated by

TRIANGULATION

the vertical projectors. We may now presume the oblique line X Y of the elevation Fig. 68 to be the intersecting line between the vertical plane and a supplementary oblique plane.

Draw in position as shown a circle whose diameter is

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