Gores to A Domed Head

Page 136

Gores to A Domed Head

Information Required: Height of domed

head (from weld to tank top) and radius of

the tank.

Step 1: Draw a horizontal line the exact

length of the radius of the tank and the rise

combined. Draw a 90-degree vertical line

the exact length of the radius of the tank

and rise combined. The two lines intersect

as shown in the drawing.

Step 2: Draw a quarter circle in the top left

area using the rise as the radius. Draw a

quarter circle in the bottom right area using

the radius of the tank.

Step 3: Divide the bottom right quarter

circle into 12 equal parts and from these

points set a straight edge that intersects the

apex to points on the small quarter circle.

Mark all 11 points on the small quarter

circle.

Step 4: Draw 90-degree vertical lines up

from every point on the large quarter circle

as shown.

Step 5: Draw 90-degree horizontal lines

from every point on the small quarter circle

as shown.

Step 6: Label all points on both quarter

circles as shown.

Step 7: Where lines 2 intersect, mark with a

dot. Do the same for lines 3-12.

Step 8: Connect all the dots to from the

tank top curve.

Step 9: Determine the gore width by trial

and error method, then draw half the gore

width on the vertical line 12 and from that

point draw a line to the Apex.

Step 10: Add a ½” bead and crimp

allowance tot eh initial horizontal line. Draw

the stretch-out the regular way.