88 lines
2.4 KiB
OpenSCAD
88 lines
2.4 KiB
OpenSCAD
include <common.scad>
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use <skin.scad>
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L_minor = 1/2 * 25.4;
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L_major = 3/4 * 25.4;
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L_thick = 1.8; //9/128 * 25.4; //1/16 * 25.4;
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T_flat_top = L_minor * 2; // 1"
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T_spine = L_major; // 3/4"
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T_tolerance = 0.285;
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// Cap_Length = 150;
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Cap_Thick = 3;
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Cap_Spine = T_spine + Cap_Thick;
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points = [[-T_spine, 0], [0, -L_minor], [0, L_minor]];
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function tri_circumcenter(pts) =
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let(
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v0 = pts[1] - pts[0],
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v1 = pts[2] - pts[1],
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d0 = (pts[1] + pts[0])/2 * v0,
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d1 = (pts[2] + pts[1])/2 * v1,
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det = -cross(v0, v1)
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)
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[cross([d1, d0], [v1.y, v0.y]), cross([d0, d1], [v0.x, v1.x])] / det;
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T_circumcenter = tri_circumcenter(points);
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tube_radius = Cap_Spine + T_circumcenter[0];
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module cap_outline(radius = 1.5, fingerboard_min_thick = 2.5, fingerboard_max_thick = 5) {
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minkowski($fn = mink_fn_2d) {
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circle(r = radius);
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difference() {
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translate(T_circumcenter) circle(r = tube_radius - radius);
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translate([fingerboard_max_thick - radius, -50]) square([100,100]);
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}
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}
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}
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module cap_outline_bridge(radius = 1.5, fingerboard_min_thick = 2.5, fingerboard_max_thick = 5) {
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minkowski($fn = mink_fn_2d) {
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circle(r = radius);
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difference() {
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translate(T_circumcenter) hull() {
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circle(r = tube_radius - radius);
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translate([50,0]) square([1,(tube_radius - radius)*2], true);
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}
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translate([fingerboard_max_thick - radius, -50]) square([100,100]);
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}
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}
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}
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function T_hole_points(r = 4, a_step = 5, offset = 0) =
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let(
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x0 = T_tolerance + offset,
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x1 = x0 - L_thick - (T_tolerance*2) - (offset*2),
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x2 = -T_spine - T_tolerance - offset,
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y_out = L_minor + T_tolerance + offset,
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y_in = L_thick + T_tolerance + offset,
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top_points = [
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[x1, -y_out],
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[x0, -y_out],
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[x0, y_out],
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[x1, y_out]
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],
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bottom_points = [
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[x2, y_in],
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[x2, -y_in],
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],
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joint_corner_left = [x1, -y_in],
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joint_corner_right = [x1, y_in],
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join_points_left = [for (a = [0:a_step:90]) joint_corner_left + [-r * (1-sin(a)), -r * (1-cos(a))]],
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join_points_right = [for (a = [0:a_step:90]) joint_corner_right + [-r * (1-cos(a)), r * (1-sin(a))]]
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)
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concat(top_points, join_points_right, bottom_points, join_points_left);
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module T_hole(r = 4, a_step = 5, offset = 0)
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polygon(T_hole_points(r=r, a_step=a_step, offset=offset));
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module tapered_T_hole(z0 = 0, z1 = 4, o0 = 1, o1 = 0) {
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// z1 must > z0 for faces to work
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pts0 = [for (pt = T_hole_points(offset = o0)) concat(pt, z0)];
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pts1 = [for (pt = T_hole_points(offset = o1)) concat(pt, z1)];
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skin([pts0, pts1]);
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}
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