0,0 → 1,54 |
Clear=0.175; // size of tolerance zone |
thickness = 2; // global wall thickness |
height = 15; // height of one screen element |
screen_radius = 75/2; // outer radius of screen |
tube_radius=30/2; // inner radius of the space for a sensor |
screen_bevel = 10; // bevel of outer screen wall |
num_ribs = 3; // number of holding ribs |
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angle_sep = 360/num_ribs; |
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translate ([0,0,height]) |
// screen upper rim |
difference () { |
cylinder (h=thickness*2,r= screen_radius - screen_bevel,$fn=100); |
translate ([0,0,-Clear/2]) |
cylinder (h=thickness*2 +Clear,r= (screen_radius - screen_bevel)- thickness ,$fn=100); |
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// screen upper rim gabs for ribs from another screen. |
for (i = [0 : (num_ribs-1)]) { |
rotate ([0,0,60 + (angle_sep * i)]) |
translate ([(screen_radius - screen_bevel)- thickness - Clear/2 ,-Clear/2,-Clear/2]) |
cube(size = [thickness + 2*Clear, thickness + Clear,thickness*2 + Clear]); |
} |
} |
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//screen |
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difference () { |
cylinder (h=height,r1=screen_radius ,r2=screen_radius - screen_bevel,$fn=100); |
translate ([0,0,-Clear/2]) |
cylinder (h=height+Clear,r1=screen_radius - thickness ,r2=(screen_radius - screen_bevel) - thickness,$fn=100); |
} |
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//inner ring |
inner_ring_thickness = thickness *2; |
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difference () { |
cylinder (h=inner_ring_thickness,r = tube_radius + thickness,$fn=100); |
translate([0,0,-Clear/2]) |
cylinder (h=inner_ring_thickness +Clear,r = tube_radius,$fn=100); |
} |
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// center ribs |
for (i = [0 : (num_ribs-1)]) { |
rotate ([90,0,angle_sep * i]) |
translate ([0,0,-thickness/2]) |
linear_extrude (height = thickness, convexity = 10) |
polygon(points=[[tube_radius + thickness, inner_ring_thickness],[tube_radius + thickness - Clear, 0],[screen_radius - thickness,0],[screen_radius - screen_bevel,height]]); |
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} |