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@xunker
Last active November 8, 2016 23:14
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Drawing an N-gon around a circle using OpenSCAD
/*
Drawing an N-gon around a circle using OpenSCAD
https://gist.github.com/xunker/daabf70dbb8e990077d3a1a11d1e06dd
Matthew Nielsen - github.com/xunker
Math credit: http://mathcentral.uregina.ca/QQ/database/QQ.09.06/s/cliff1.html
*/
/* Diameter of the circle around which the n-gon will be built. */
circle_d = 21.6; // 21.6mm is 3/4 inch.
/* Number of sides the n-gon should have. Needs to be 3 or more, or else it's
not a polygon anymore. */
sides = 8;
/* -- no more changes needed below this -- */
circle_r = circle_d/2;
theta = 360 / (sides*2); // sides*2 because each section has two radians to centre.
side_length = (circle_r*2)*tan(theta);
side_angle = theta*2;
%cylinder(h=1, d=circle_d, $fn=32, center=true);
for (angle = [0:side_angle:359]) {
rotate([0,0,angle])
translate([0,circle_d/2,0])
cube([side_length,0.1,1], center=true);
}
Display the source blob
Display the rendered blob
Raw
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