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Intermediate flagclip.scad

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Matthias Neeracher 2023-08-14 04:45:36 +02:00
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commit 7207aa3940
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/*
* Flagclip - Flag attachment carabine
*
* Copyright (C) 2022-23 Matthias Neeracher <microtherion@gmail.com>
*/
wire_dia = 3.9; /* Diameter of flagpole wire */
thickness = 4.0; /* Thickness (Z) */
wall = 4.0; /* Width of outer wall */
function intersect_circle(p0, v, r) =
let (num = sqrt((r^2-p0[0]^2)*v[1]^2+2*p0[0]*p0[1]*v[0]*v[1]+(r^2-p0[1]^2)*v[0]^2)-p0[1]*v[1]-p0[0]*v[0],
l = num/(v[1]^2+v[0]^2)) p0+l*v;
module flagclip(wire_dia=wire_dia, thickness=thickness, wall=wall,
spring_center= 3.0, /* */
spring_gap = 3.0, /* */
cara_aperture= 45.0, /* */
cara_arm = 15.0, /* */
gap = 1.0, /* */
clip_aper = 2.5, /* */
clip_base = 12.0, /* */
clip_arm = 18.0, /* */
clip_arc = 290.0, /* */
clip_wall = 2.0, /* */
clip_clear = 4.0, /* */
clip_lever = 4.0) /* */
{
spring_inner_in_r = spring_center;
spring_inner_out_r = spring_inner_in_r + wall;
spring_outer_in_r = spring_inner_out_r + spring_gap;
spring_outer_out_r = spring_outer_in_r + wall;
cara_ratio_r = [sin(0.5*cara_aperture), cos(0.5*cara_aperture)];
cara_ratio_out_r = [cos(0.5*cara_aperture), -sin(0.5*cara_aperture)];
cara_inner_bot_r = spring_outer_in_r*cara_ratio_r;
cara_outer_bot_r = (spring_outer_in_r+0.5*wall)*cara_ratio_r+wall*cara_ratio_out_r;
cara_inner_top_r = (spring_outer_in_r+cara_arm)*cara_ratio_r;
cara_outer_top_r = cara_inner_top_r+wall*cara_ratio_out_r;
cara_ratio_l = [-sin(0.5*cara_aperture), cos(0.5*cara_aperture)];
cara_ratio_out_l = [-cos(0.5*cara_aperture), -sin(0.5*cara_aperture)];
cara_inner_bot_l = spring_outer_in_r*cara_ratio_l;
cara_outer_bot_l = (spring_outer_in_r+0.5*wall)*cara_ratio_l+wall*cara_ratio_out_l;
cara_inner_top_l = (spring_outer_in_r+cara_arm)*cara_ratio_l;
cara_outer_top_l = cara_inner_top_l+wall*cara_ratio_out_l;
cara_inner_gap_l = (spring_outer_in_r+cara_arm-gap)*cara_ratio_l;
cara_outer_gap_l = cara_inner_gap_l+wall*cara_ratio_out_l;
cara_loop_center = [0,cara_inner_top_r[1]];
cara_loop_in_r = cara_inner_top_r[0];
cara_loop_out_r = cara_loop_in_r+wall;
clip_half_aperture = asin(0.5*(clip_base-clip_aper)/clip_arm);
clip_ratio_r = [sin(clip_half_aperture), -cos(clip_half_aperture)];
clip_ratio_out_r = [-clip_ratio_r[1], clip_ratio_r[0]];
clip_inner_in_r = [0.5*clip_aper, -spring_inner_in_r*cos(asin(0.5*clip_aper/spring_inner_in_r))];
clip_inner_in_l = [-clip_inner_in_r[0], clip_inner_in_r[1]];
clip_inner_out_r = [0.5*clip_aper, -spring_inner_out_r*cos(asin(0.5*clip_aper/spring_inner_out_r))];
clip_inner_out_l = [-clip_inner_out_r[0], clip_inner_out_r[1]];
clip_bot_in_r = clip_inner_out_r+clip_arm*clip_ratio_r;
clip_bot_out_r = clip_bot_in_r+wall*clip_ratio_out_r;
clip_inner_r = clip_bot_out_r-(clip_arm+0.5*wall)*clip_ratio_r;
clip_inner_inter_r = intersect_circle(clip_inner_r, clip_ratio_r, spring_inner_out_r);
clip_ratio_l = [-clip_ratio_r[0], clip_ratio_r[1]];
clip_ratio_out_l = [clip_ratio_l[1], -clip_ratio_l[0]];
clip_bot_in_l = clip_inner_out_l+clip_arm*clip_ratio_l;
clip_bot_out_l = clip_bot_in_l+wall*clip_ratio_out_l;
clip_inner_l = clip_bot_out_l-(clip_arm+0.5*wall)*clip_ratio_l;
clip_outer_inter_l = intersect_circle(clip_inner_l, clip_ratio_l, spring_outer_out_r);
clip_inner_inter_l = intersect_circle(clip_inner_l, clip_ratio_l, spring_inner_out_r);
clip_outer_gap_t = clip_outer_inter_l+clip_clear*clip_ratio_l;
clip_outer_gap_b = clip_outer_gap_t+gap*clip_ratio_l;
clip_inner_gap_t = clip_outer_gap_t-wall*clip_ratio_out_l-clip_lever*clip_ratio_l;
clip_inner_gap_b = clip_inner_gap_t+gap*clip_ratio_l;
wire_center = [0, clip_bot_in_r[1]+0.5*wire_dia];
linear_extrude(height=thickness) {
/* Spring */
difference() {
union() {
difference() {
circle(r = spring_outer_out_r);
circle(r = spring_outer_in_r);
}
circle(r = spring_inner_out_r);
translate([-spring_outer_in_r-1,-0.5*wall,0])
square(size=[2*spring_outer_in_r+2, wall]);
}
circle(r = spring_inner_in_r);
/* Opening for Carabine */
polygon(points=[cara_inner_bot_r, cara_inner_top_r, cara_inner_top_l, cara_inner_bot_l]);
/* Opening for Clip */
polygon(points=[clip_inner_in_l, clip_inner_out_l, clip_bot_in_l, clip_bot_in_r, clip_inner_out_r, clip_inner_in_r]);
polygon(points=[clip_inner_gap_b, clip_inner_gap_t, clip_outer_gap_t, clip_outer_gap_b]);
}
/* Carabine */
difference() {
translate(cara_loop_center) circle(r = cara_loop_out_r);
translate(cara_loop_center) circle(r = cara_loop_in_r);
polygon(points=[cara_outer_top_r, cara_inner_top_r, cara_loop_center, cara_inner_top_l, cara_outer_top_l, [cara_outer_top_l[0], 0], [cara_outer_top_r[0], 0]]);
}
polygon(points=[cara_outer_bot_r, cara_outer_top_r, cara_inner_top_r, cara_inner_bot_r]);
polygon(points=[cara_outer_bot_l, cara_outer_gap_l, cara_inner_gap_l, cara_inner_bot_l]);
/* Clip */
difference() {
translate(clip_bot_in_r) circle(r=wall);
translate([clip_bot_in_r[0]-wall, clip_bot_in_r[1]-wall]) square(size=[wall, 2*wall]);
}
polygon(points=[clip_bot_in_r, clip_bot_out_r, clip_inner_inter_r, clip_inner_out_r]);
difference() {
translate(clip_bot_in_l) circle(r=wall);
translate([clip_bot_in_l[0], clip_bot_in_r[1]-wall]) square(size=[wall, 2*wall]);
}
difference() {
polygon(points=[clip_bot_in_l, clip_inner_out_l, clip_inner_inter_l, clip_bot_out_l]);
polygon(points=[clip_inner_gap_b, clip_inner_gap_t, clip_outer_gap_t, clip_outer_gap_b]);
}
translate([clip_bot_in_l[0], clip_bot_in_l[1]-wall]) square(size=[clip_base, wall]);
difference() {
translate(wire_center) circle(r=0.5*wire_dia+clip_wall);
translate(wire_center) circle(r=0.5*wire_dia);
}
}
}
flagclip();