Alternate for Square to Round

Page 96

Alternate for Square to

Round

Information Required: (Include insulation in

measurements) Turn height, square

dimensions, round dimensions

Step 1: Draw a plan view and letter as

shown. Mark the true height on the right

vertical line.

Step 2: Trisect the bottom right quarter

circle into equal parts and label.

Step 3: Set dividers at point A and point 1

and swing an arc from the base line to the

right vertical line. Do the same for point 2.

Points 1 and 4 intersect as do points 2 and

3.

Step 4: Set dividers at point S and point 4

and transfer to the horizontal line going

from bottom right point A to the left. Label

the points on the horizontal line as shown

Step 5: Draw lines from the apex (true

height point) to all points on the horizontal

line. These will be the slant heights.

Step 6: For the stretch-out draw a line the

exact length of a square side and label both

points A.

Step 7: From the plan view, set dividers at

the apex and points 1-4 on the horizontal

line. Transfer these points to the layout

from both points A to an intersecting point

on the layout to from point 1 on the layout.

Step 8: Using a second pair of dividers, take

a set from 1 to 2 on the quarter circle of the

plan view and on the layout draw arcs to

both sides of point 1.

Step 9: From the plan view, set dividers at

the apex and point 2-3 on the horizontal

line and transfer them to the layout from

both A points to intersect with the last arcs

shown.

Step 10: Do the same to obtain points 3 and

4 on the layout.

Step 11: From points A, draw arcs to either

side using half the distance of a square side.

Step 12: From the plan view set dividers at

the apex the S-4 point and the 4 points on

the layout draw intersecting arcs to the last

arcs drawn. These points will be pint S on

the layout.

Step 13: Connect all the points to form half

the fitting.

Step 14: Add for laps and notches where

required.