Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . quarter circle into eight equal parts, as i, 2,3, 4, etc. After having done this, draw lines from C throughthe points 2, 4, 6. On these points, at right angles to the radiallines and tangent to the circle, draw straight lines of an in-definite length, intersecting each other at MNPQ. Then onthe line CE, set off the half diameter of the large end on each joints of the intersection of these lines at the back and inthe throat with
Laying out for boiler makers and sheet metal workers; a practical treatise on the layout of boilers, stacks, tanks, pipes, elbows, and miscellaneous sheet metal work . quarter circle into eight equal parts, as i, 2,3, 4, etc. After having done this, draw lines from C throughthe points 2, 4, 6. On these points, at right angles to the radiallines and tangent to the circle, draw straight lines of an in-definite length, intersecting each other at MNPQ. Then onthe line CE, set off the half diameter of the large end on each joints of the intersection of these lines at the back and inthe throat with lines, the. different sections of the elbow aredefined. The side elevation is complete and the final shapeand correct dimensions are determined. Now, prepare for the development of the pattern of thelarge end, but in order not to get too many lines piled on topof one another, make a separate drawing of this end section,as shown in Fig. 2. Within the points i, 0, h, 9, continue thecenter line far enough above and below the figure so as to beable to lay Figs. 3 and 4 on it. Then below Fig. 2, draw ahorizontal line i, 9, Fig. 3, and from its intersection with the. PATTERN FOR END SECTION OF side of the center A, and on the line CD, set off the half di-ameter of the small end on each side of the center B. Now, in order to get a regular taper it is necessary to havethe diameters of the ends of the different sections at the miteror joint lines. To determine these, set off on the line AEfrom A, the half diameter of the small end, which leaves thedistance JK as the difference of half the diameters of thetwo ends. This difference must be divided into four equalparts, consisting of three whole and two half parts, just asthe elbow is divided into three whole and two half sections,and the half parts should be at the end as shown. Then thedistance Aq is the half the joint line 7; the dis-tance Ap is the half diameter on the joint line 5; the distanceAn is the half diameter on jo
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Keywords: ., bookcentury1900, bookdecade1900, bookidl, booksubjectsteamboilers
