Section 23: Another Method for an Unequal Tee (Stem Portion)

Required Information

Connect these points and label them as Points A and B as shown in Where the line drawn from 1 to 7 intersects with the Center Line, label that Point C Set dividers at Points A and C and do one walk-up on the Center Line from Point C to form Point D Connect these points going from A to D then to B Continue the vertical lines from the arc points to Lines A, D, and B For half the stem portion of the fitting, take half the Circumference and divide that into six equal parts in Figure 2.

Step 2
Trisect or bisect the semi-circle into equal parts and from the horizontal line draw 90 degree lines up through these trisected or bisected points of the semi-circle. Label these lines
Step 3
Using the radius set at half the O.D.I.., do one walk-up on Line 1 and three walk-ups on Line 7. Connect these points and label them as Points A and B as shown in
Step 4
Where the line drawn from 1 to 7 intersects with the Center Line, label that Point C
Step 5
Set dividers at Points A and C and do one walk-up on the Center Line from Point C to form Point D
Step 6
Connect these points going from A to D then to B
Step 7
Continue the vertical lines from the arc points to Lines A, D, and B
Step 8
For half the stem portion of the fitting, take half the Circumference and divide that into six equal parts in Figure 2. Label as shown
Step 9
Measuring from the Base Line to the A-D-B Line, measure each line and transfer that measurement to corresponding numbered lines on the Stretch-out and connect all these points. Step10. Draw a 90 degree horizontal line from Line 1 to Line 7 making sure to intersect with line 4 (Center Line) as shown in Figure 2. Save the portions as shown in Figure 2. For the other portion of the fitting add a lap allowance. Stepll. Using the cross-hair method, apply the pieces saved from Step10 to the cross-hairs as shown in Figure 3. This will be the hole cut- out. Add a lap allowance as required. Fig