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BP1062 Pyramid Template
by Uri Hofi
When I want or need to produce geometrical parts like pyramids, cones, pipe joinery, I like very much to use pattern development geometry or volume geometry. I am going here to demonstrate the pattern development of a pyramid, that the base is 7 inches and the height is 6 inches.
The tools
Thick cardboard, compass, ruler, right angle, Japanese knife and a sharpie.
Mark on the cardboard long line with the right angel
Two right angel lines to the first line 4 inches apart
With the compass mark to both sides 8 inches and down to the bottom
With the same 8 inch mark the 45 degrees. Line point on both sides
Connect the bisect points to the apex and we get the 45 degrees lines
Open the compass to 7 inches, the size of the pyramid base and mark the four corners of the square
Connect the point 1-2-3-4 to get a square, connect points 1-3 with a line and we get plan a the view of the pyramid from above.
Raise from points 1-3 up to bisect the upper parallel line
Mark 6 inches that will demonstrate the height of the pyramid
Mark the apex with o and then we get plan b the way we see the pyramid from the side on the diamond
The finished plan a--b
Now we are ready to develop the elevation of the pyramid templet
Open the compass from point o to 1 and draw a circle as shown
Open the compass to 7 inches of plan a and draw the marks on the circle starting from point 1 and on
Mark the sections 1-2-3-4-1'
Connect this points with lines which are the cords of the arc, then draw in the radial lines to the apex o
With a Japanese knife cut the frame lines of the developed elevation outer lines 0-1-2-3-4-1'-0
Take the template out
Cut shallow cuts along the radial lines and fold
Get the pyramid
6 inches height 7 inches wide
The tools again
If one knows the basic rules of the volume geometry a templet like this takes no more then 15 minutes to do with the very simple tools Of the shop no computer no equations no mathematics
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