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flag-clip
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SCAD implementation seems to match

This commit is contained in:
Matthias Neeracher 2023-08-14 05:54:12 +02:00
parent 7207aa3940
commit 3565bb7357
2 changed files with 26 additions and 9 deletions
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35
flagclip.scad
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@ -12,6 +12,9 @@ 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;
function intersect_lines(p0, v, q0, w) =
let (l = (-q0[0]*w[1]+p0[0]*w[1]+(q0[1]-p0[1])*w[0])/(v[1]*w[0]-v[0]*w[1])) p0+l*v;
module flagclip(wire_dia=wire_dia, thickness=thickness, wall=wall,
spring_center= 3.0, /* */
spring_gap = 3.0, /* */
@ -33,17 +36,19 @@ module flagclip(wire_dia=wire_dia, thickness=thickness, wall=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_inner_bot_r = [0.5*spring_gap, spring_outer_in_r*cos(asin(0.5*spring_gap/spring_outer_in_r))];
cara_inner_top_r = cara_inner_bot_r+cara_arm*cara_ratio_r;
cara_outer_top_r = cara_inner_top_r+wall*cara_ratio_out_r;
cara_outer_top_rp = cara_inner_top_r+(wall+1)*cara_ratio_out_r;
cara_outer_bot_r = cara_outer_top_r-(cara_arm-0.5*wall)*cara_ratio_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_inner_bot_l = [-cara_inner_bot_r[0], cara_inner_bot_r[1]];
cara_inner_top_l = cara_inner_bot_l+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_top_lp = cara_inner_top_l+(wall+1)*cara_ratio_out_l;
cara_outer_bot_l = cara_outer_top_l-(cara_arm-0.5*wall)*cara_ratio_l;
cara_inner_gap_l = cara_inner_bot_l+(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];
@ -72,6 +77,12 @@ module flagclip(wire_dia=wire_dia, thickness=thickness, wall=wall,
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];
clip_angle = 180-0.5*clip_arc;
wire_ratio = [sin(clip_angle), cos(clip_angle)];
wire_out_r = clip_wall*[wire_ratio[1], -wire_ratio[0]];
clip_wire_inter_r = intersect_lines(clip_bot_in_r, clip_ratio_r, wire_center, wire_ratio);
clip_wire_inter_l = [-clip_wire_inter_r[0], clip_wire_inter_r[1]];
wire_out_l = clip_wall*[-wire_ratio[1], -wire_ratio[0]];
linear_extrude(height=thickness) {
/* Spring */
@ -96,7 +107,7 @@ module flagclip(wire_dia=wire_dia, thickness=thickness, wall=wall,
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_top_rp, cara_inner_top_r, cara_loop_center, cara_inner_top_l, cara_outer_top_lp, [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]);
@ -116,8 +127,14 @@ module flagclip(wire_dia=wire_dia, thickness=thickness, wall=wall,
}
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);
union() {
translate(wire_center) circle(r=0.5*wire_dia+clip_wall);
polygon(points=[wire_center, wire_center+wire_out_r, clip_wire_inter_r+wire_out_r, clip_wire_inter_r]);
polygon(points=[wire_center, clip_wire_inter_l, clip_wire_inter_l+wire_out_l, wire_center+wire_out_l]);
}
translate(wire_center) circle(r=0.5*wire_dia);
polygon(points=[wire_center, clip_wire_inter_r, clip_wire_inter_l]);
translate(clip_wire_inter_l) square([clip_base, wall]);
}
}
}

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flagclip.stl
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