Draw perpendicular construction lines at each of these points.
Sheet metal sphere layout.
If you have been working in a sheet metal shop plan to work in one or just want to sharpen and improve your skills with sheet metal then this manual will help you to do that.
Starting at the base using the dividers place station marks at 6 inch intervals on the pattern centerline and number the stations 1 through 10 to correspond to the quarter dome layout in detail 13 8c.
Measure and mark out 5 in 13 mm on the reference line.
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Holding it there press in the third tack.
Place the compass on point 4 and swing arcs to mark to the right and to the left.
Darken lines 1 2 3 and 4 1.
Using a piece of metal at least 18 inches wide by 54 inches long place a centerline along it length.
I d like to make a sheet metal ball maybe two inches in diameter.
C d c 3 14 x 2 in 50 mm 6 2 in 157 mm 1 12th of the circle 6 2 in 157 mm 12 5 in 13 mm 12.
Slide the hand from the center of the paper toward the lower right hand corner and insert the fourth tack.
Lay the left hand on the middle of the sheet and slide it toward the upper left hand corner.
The paper is die cut in a pattern so that the cut pieces come together to form the hemisphere with no creasing or folding.
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This completes the operation.
Project the points 1 2 3 and 4 from the front view step 2.
Set the compass at 5 in 13 mm 1 12th circumference.
I ve seen on how they make it or some show that they die cut paper for globes and then form the cut paper over a cardboard hemisphere.
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This will become the guideline of the pattern for the dome panels.
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