77 lines
2.7 KiB
OpenSCAD
77 lines
2.7 KiB
OpenSCAD
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inner_d = 18.2;
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outer_d = 23;
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bearing_d = 2.5;
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res = 50;
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num_bearings = 3;
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delta = 360 / num_bearings;
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bearing_circle_r = 7.8;
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bearing_circle_y = -3;
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tube_h = 4.5;
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offset = 30;
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screw_d = 1.85;
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screw_x = 12.8;
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screw_y = 9.05;
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screw_y2 = 9.3;
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plate_thickness = 3.1; // was 2.6
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difference() {
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union() {
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difference() {
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union() {
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translate([0,0,2]) sphere(d = outer_d, $fn = res);
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translate([-6.12, 0, -tube_h - tube_h/2]) cylinder(h = tube_h, d=4, $fn = res, center = true);
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translate([ 6.12, 0, -tube_h - tube_h/2]) cylinder(h = tube_h, d=4, $fn = res, center = true);
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}
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translate([-4,-4,-11]) cube([8,8,9]);
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translate([-12,-12,0]) cube([24,24,14]);
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union() {
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for (i = [0:2]) {
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phi = offset + i * delta;
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translate([
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bearing_circle_r * cos(phi),
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bearing_circle_r * sin(phi),
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bearing_circle_y])
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sphere(d = 0.5+bearing_d, $fn=res);
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}
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translate([0,0,2]) sphere(d = inner_d, $fn=res);
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// tube screw cuts
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translate([-6.12, 0, -tube_h - tube_h/2]) cylinder(h = tube_h+2, d=screw_d, $fn = res, center = true);
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translate([ 6.12, 0, -tube_h - tube_h/2]) cylinder(h = tube_h+2, d=screw_d, $fn = res, center = true);
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}
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}
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// bearings
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/*for (i = [0:2]) {
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phi = offset + i * delta;
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translate([
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bearing_circle_r * cos(phi),
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bearing_circle_r * sin(phi),
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bearing_circle_y])
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sphere(d = bearing_d, $fn=res);
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}*/
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// plate
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translate([0,0.5,0]) difference() {
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translate([0, 0, -plate_thickness/2]) cube([28.5, 21.5, plate_thickness], center = true);
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translate([0,-0.5,0]) translate([0, 0, plate_thickness]) sphere(d = outer_d-0.5, $fn = res);
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translate([-screw_x, screw_y, 0]) cylinder(h = 8, d=screw_d, $fn = res, center = true);
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translate([ screw_x, screw_y, 0]) cylinder(h = 8, d=screw_d, $fn = res, center = true);
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translate([-screw_x,-screw_y2, 0]) cylinder(h = 8, d=screw_d, $fn = res, center = true);
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translate([ screw_x,-screw_y2, 0]) cylinder(h = 8, d=screw_d, $fn = res, center = true);
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}
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// trackball itself
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//translate([0,0,1]) sphere(d = 15, $fn=res);
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}
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// cut away outer sphere overhang (due to assymetry)
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translate([0,-21.5/2 - 0.5,-plate_thickness/2]) cube([30,2,plate_thickness+1], center = true);
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// cut view
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//translate([0,0,-10]) cube(20, center=false);
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};
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