/* * Flagclip - Flag attachment carabine * * Copyright (C) 2022-23 Matthias Neeracher */ 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();