Another Method for a 45-Degree Equal Lateral

Page 113

Another Method for a 45-

Degree Equal Lateral

Information Required: ODI

Step 1: Draw a rectangle using the ODI

Step 2: Draw a semi-circle at each end of

the rectangle and trisect both bottom

quarters as shown in figure 1.

Step 3: Draw a horizontal line across to each

intersecting points of the arcs.

Step 4: Draw a 90-degree vertical line from

the base line to the top line. Where the

center line and the 90-degree vertical line

intersects is point A.

Step 5: Divide the diameter by 5 and set the

dividers to that measurement. On the

horizontal base line, draw 1 walk-out to the

left and 5 walk-outs to the right of the 90-

degree vertical center line.

Step 6: Connect walk-out point 1 and walk-

out point 5 to point A.

Step 7: Where these lines intersect with the

horizontal lines 1, 2, 3 and 4, draw 90-

degree lines downward as shown in figure

1.

Step 8: Set dividers at points 1 and 2 on the

semi0circle and do a 3-point walk-out down

on the lines just drawn in step 7. Draw 90-

degree horizontal lines across and label

these lines as shown in figure 1.

Step 9: Connect all intersecting points at

corresponding numbered lines. The

resulting drawing will be half the pattern

required for the hole cut-out.

Step 10: For the stem portion of the fitting,

lay the pattern on the material as shown in

figure 2. Allow for laps and tabs where

necessary.