Section 36: Rectangular to Round

Required Information

• Height
• True height

Formulas and Measurements

• Divide this line into 2 equal parts and label as shown in Figure 3.
• From Point B draw a 90 degree vertical line; this will be the Center From the Elevation View, set dividers at Slant Height B-1 and transfer this set to the layout going from point B to an intersecting point on the Center Line to form Draw a 90 degree horizontal line to each side of Point 1.
• The ends of these lines will be labeled From both Points 2, swing arcs to either side using half the small square dimensions From the elevation view, set dividers at Slant Height A-3 and transfer to the layout by using A as the Apex and going to an intersecting point on the last arcs drawn.
• Label this point as Set dividers at slant height B-1 and swing arcs off to the side of Point A, using Point 3 as an Apex.
• Then using half the large square dimension, set dividers at Point A and swing an intersecting arc to the last arc drawn to obtain Point C Connect all points to form half the fitting.

Procedure

1. Step 1

   Draw both Elevation and Plan Views. On the Plan View draw lines to the various points as shown in Figure 2, and label those points as shown. Also on the Elevation View draw a Center Line dividing the fitting in half

2. Step 2

   From the Plan View take measurements from B-1 and transfer it to the Elevation View. This measurement is placed on the horizontal line going from the Center Line to the right. Do the same for Points A-2 and A-3. As this is an equal sized fitting, we only need to measure one quarter of the fitting. Label these three points as shown

3. Step 3

   To start the layout, draw a line the width of the large square. Divide this line into 2 equal parts and label as shown in Figure 3. From Point B draw a 90 degree vertical line; this will be the Center

4. Step 4

   From the Elevation View, set dividers at Slant Height B-1 and transfer this set to the layout going from point B to an intersecting point on the Center Line to form

5. Step 5

   Draw a 90 degree horizontal line to each side of Point 1. These lines to each side will be half the dimension of a small square side. The ends of these lines will be labeled

6. Step 6

   From both Points 2, swing arcs to either side using half the small square dimensions

7. Step 7

   From the elevation view, set dividers at Slant Height A-3 and transfer to the layout by using A as the Apex and going to an intersecting point on the last arcs drawn. Label this point as

8. Step 8

   Set dividers at slant height B-1 and swing arcs off to the side of Point A, using Point 3 as an Apex. Then using half the large square dimension, set dividers at Point A and swing an intersecting arc to the last arc drawn to obtain Point C

9. Step 9

   Connect all points to form half the fitting. For the other half, add a lap