Parallel Line Pattern Development

# 16 Unequal Diameter 90 Degree Tee-Shop Method

- Calculate the blank size. Use the stretch-out for one dimension (
**horizontal**) and the seam height plus the radius of the pipe for the second (vertical) dimension. Add any seam allowances on before shearing the blank size.

- With your dividers, swing the
**radius**of the pipe to 180° at the bottom of the blank. Then, from the same radius point, swing the radius of the tee and divide it into 6 equal parts (see Divide a Circle Into 12 Equal Parts) and label it.**Remember that only the tee is divided**.**Also, notice that the half circles are symmetrical, so a quarter circle is the minimum required in this case.**

- Project the divisions of the tee
**vertically**into the pipe and where they intersect, project them horizontally.

- Divide the blank size into 12 equal parts (see Divide a Line Using a Ruler on an Angle).
**Remember to only divide the circumference, any seam allowance should not be included in the divisions.**

- Label the
**stretch-out**to match the**profiles**, starting at the seam.

- Start the
**pattern**at your seam and follow the labeling.**Notice the pattern of over 1, up/down 1, until you reach the last line and then it reverses.**

- Draw the
**miter line**on the**pattern**with a flexible curve

a line/plane level with the horizon. Flat, level

the distance from center to any point of the circumference, half the diameter

a line/plane straight up and down, vertically level (plumb)

a shape which has been “stretched out”, to take a perimeter and make it straight

a half of a plan view, drawn on the outside of an object

the shape of the object, still in 2D form

an intersection of 2 pieces- an irregular cut on the end of something