Triangulation

# 26 Off-Centre Square to Round

The only difference with this fitting is a few more element line lengths than an on-centre, the process is exactly the same.

- Draw a full
**plan view**complete with all**element lines**and labeling. Choose a line of symmetry to place the seam so you only need to make 1 pattern. Label one half of the plan view, the round end with numbers and the square end with letters. - Create a
**TLD**and label it

- Draw a baseline equal to line A-B.

- Pick up the
**true length**of line A-4 and swing it from point A. - Next, pick up true length of line B-4 and swing it from point B. Where it crosses the first arc, becomes point 4.
- Pick up a step-off from the plan view and swing it from point 4.
**Unlike an on-centre square to round, this fitting needs to be developed one side at a time. Complete one side, then go back to finish the other side.** - Pick up the true length of line A-3 and swing it from point A.
- Pick a step-off and swing it from point 3.
- Pick up the true length of line A-2 and swing it from point A.
- Pick up a step-off and swing it from 2.

- Pick up the true length of line A-1 and swing it from point A.
- Pick up the true length of line D-1 and swing it from 1.
- Pick up line A-D from the plan view (remember that letter to letter is true length) and swing it from point A.
**Remember that point D should be 90****°. If it not, go back and check your work.**

- Now, go back to point 4 and work the pattern to the other side, completing it at point C. Notice in this example, line C-7 has no length in the plan view, it is a dot. The true length is the
**vertical**height. Zero plan length put 90 deg to the vertical height, will have no change to the vertical height. - Draw in the all the element lines and outside edges, using a flexible curve for the round end.

definition

looking down at something, a “birds eye view”, “floor plan” (2D)

a line representing an edge or bend

a 90° corner in that we use to find the actual length of a line

a dimension or line that is not distorted by the view

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