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added chamfer distance variable to taper in the bottom of the dome heads

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texas
2024-08-16 16:49:04 -05:00
parent e9292d9165
commit 37fe83e2e0
2 changed files with 22 additions and 14 deletions
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34
vitamins/screw.scad
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@ -235,27 +235,35 @@ module screw(type, length, hob_point = 0, nylon = false) { //! Draw specified sc
cylinder(h=2 * eps, r=socket_rad + eps); cylinder(h=2 * eps, r=socket_rad + eps);
shaft(); shaft();
} }
if(head_type == hs_dome) { if(head_type == hs_dome) {
R_minus_h = head_height; // h would be the height of the sphere cap that's cut off of the top of the screw dome edge_height = head_rad / 7.5;
a= socket_rad; head_chamfer_x=edge_height/2;
// this is the trig way to do this, head_fillet_radius= 0.5;
// alpha=atan(R_minus_h/a); p0 = [head_rad, edge_height]; // Lowest point on the arc
// R = R_minus_h/sin(alpha); //Radius if the cap was a perfect unscaled sphere p1 = [1.3 * socket_rad / cos(30), head_height]; // Highest point on the arc
// this is mathematcially equivalent, but may run faster computationally with sqrt and ^2 instead of trig p = (p0 + p1) / 2; // Start of bisector
R= a*sqrt((R_minus_h^2/a^2)+1); // Radius if the cap was a perfect unscaled sphere gradient = (p0.x - p1.x) / (p1.y - p0.y); // Gradient of perpendicular bisector = -1 / gradient of the line between p10 and p1
dome_height_scaling_factor= R/head_rad; c = p.y - gradient * p.x; // Y ordinate of the centre of the dome
r = norm(p1 - [0, c]); // Dome radius is distance from centre
color(colour) { color(colour) {
rotate_extrude() { rotate_extrude() {
difference() { difference() {
intersection() { intersection() {
scale([1,dome_height_scaling_factor]) translate([0, c])
circle(r=head_rad); circle(r);
square([head_rad, head_height]); // square([head_rad, head_height]);
offset(head_fillet_radius) offset(-head_fillet_radius)
polygon(points = [
[0,0],
[head_rad-head_chamfer_x,0],
[head_rad, edge_height],
[head_rad,head_height],
[0,head_height],
]);
} }
translate([0, head_height - socket_depth]) translate([0, head_height - socket_depth])
square([socket_rad, 20]); square([socket_rad, 10]);
} }
} }
linear_extrude(head_height) linear_extrude(head_height)