78 lines
2.2 KiB
OpenSCAD
78 lines
2.2 KiB
OpenSCAD
// Calibration object for delta sizing
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//
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// Generate STL using OpenSCAD:
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// openscad calibrate_size.scad -o calibrate_size.stl
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base_radius = 70;
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base_height = 1.5;
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base_width = 8;
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cylinder_height = 5;
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cylinder_radius = 5;
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cylinder_outer_dist = 65;
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ridge_cut_radius = .5;
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text_height = 1;
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text_size = 5;
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spoke_angles = [0, 60, 120, 180, 240, 300];
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CUT=0.01;
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// Circular ring around entire object (to help reduce warping)
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module base_ring() {
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difference() {
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cylinder(h=base_height, r=base_radius);
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translate([0, 0, -CUT])
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cylinder(h=base_height + 2*CUT, r=base_radius-base_width);
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}
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}
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// The base ring plus the base spokes
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module base() {
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base_ring();
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// Spokes
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for (angle=spoke_angles)
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rotate([0, 0, angle])
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translate([-base_width/2, -CUT, 0])
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cube([base_width, base_radius-base_width+2*CUT, base_height]);
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}
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// Cylinder that measurement ridges are cut out of
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module measuring_cylinder() {
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cut_width = cylinder_radius;
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difference() {
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cylinder(h=cylinder_height+CUT, r=cylinder_radius, $fn=60);
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for (angle=spoke_angles)
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rotate([0, 0, angle])
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translate([-cut_width, cylinder_radius - ridge_cut_radius, -CUT])
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cube([2*cut_width, cut_width, cylinder_height+3*CUT]);
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}
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}
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// All the measuring cylinders around the ring
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module measuring_cylinders() {
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measuring_cylinder();
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for (angle=spoke_angles)
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rotate([0, 0, angle])
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translate([0, cylinder_outer_dist, 0])
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measuring_cylinder();
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}
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// Text writing
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module write_text(angle, dist, msg) {
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text_offset = dist + 1 - text_size/2;
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rotate([0, 0, angle])
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translate([0, text_offset, base_height - CUT])
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linear_extrude(height=text_height + CUT)
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text(msg, size=text_size, halign="center");
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}
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// Final object with text descriptions
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module calibration_object() {
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base();
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translate([0, 0, base_height-CUT])
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measuring_cylinders();
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write_text(120, cylinder_outer_dist - 20, "A");
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write_text(240, cylinder_outer_dist - 20, "B");
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write_text(0, cylinder_outer_dist - 20, "C");
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}
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calibration_object();
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