Sheet-metal work; a manual of practical self-instruction in the art of pattern drafting and construction work in light and heavy gauge metal, including skylights, roofing, cornice work, etc by Neubecker William 1864- & American Technical Society

Author:Neubecker, William, 1864- & American Technical Society
Language: eng
Format: epub
Tags: Sheet-metal work
Publisher: Chicago American technical society
Published: 1917-03-25T05:00:00+00:00

Fig US will have no difficulty in laying out any patterns no matter what the pitch of the slqrlight may be, or what angle ita plan may have.

Krst draw any center line as A B, at right angles to which lay oil C 4', equal to 12 inches. Assuming that the light is to have one-third

Fig. 174. pitch, then make the dbtance C D equal to 8 inches which is one-third of 24 inches, and draw die slant line D 4.' At right angles to D 4' place a section of the common bar as shown by E, through which draw lines parallel to D 4', intersecting the curb showii from a to / at the bottom and the inside section of the ventilator from F to G at the top. At

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pleasure draw the sectiod of the outade v^it shown from % to I and the hood shown from miop. X represents the section of the brace resting <m t; to uj^old the hood resting on it in the comer o. 'Die condensa-

Iflg. 176. tion gutters of the common b^ E are cut out at the bottom at 5' 6' l^ch allows the drip to go Into the gutter d e f ot the curb and pass out of the opening indicated by the arrow. Number the comers of each half of the common bar section E as shown, from 1 to 6 on eadi side, through whicli draw lines parallel to D 4' until they intersect the curb at the bottom as shown by sdmilar numbers 1' to 6', and the in£dde ventilator at the top by similar figures 1"* to 6*. This completes the one half-section of the slgrlight. From tiiis section &e pattern for the oom-B mon bar can be obtained without

^■"^ the plan, as follows:

At right angles to D 4' draw the line I J upon whidb place the stretdiout of the section E as shown by similar figures on IJ. Ilirough these small figures, and at right angles to IJ, draw lines, and intersect them by lines drawn at right angles to D 4' from amilarly numbered intersections 1' to 6' on tlie curb and 1' to 6" on the inside ventilator. Trace a line throu^ points thus obtained; then A' B' C* D' will be the

pattern for the common bar in a hipped skylight. TTie some method would be employed if a pattern were developed tor a flat or a double-pitch light. From this smue half section the pattern for the curb is developed by taking the stretchout of the various corners in the curb, aby i' cde and /, and pladng them on the center line A B as shown by similar letters and figures. Through these divisions and at right angles to A B draw lines which intersect with lines drawn at right angles to C 4' from similar points in the curb section a f. Trace a line through points thus obtained; then E* P / a will be the half patton for the curb shown in the half section.

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