// -*- C -*- include module FArcSegment_mask(beta) { for (i=[0 : 0.75 : 3]) { rotate(i*beta/4) polygon([[0, 0], [1, 0], [cos(beta/4), sin(beta/4)]]); } } module FArcSegment(xc,yc,inrad,outrad,alpha,delta) { translate([xc,yc]) { intersection() { difference() { circle(r=outrad, $fn=70); circle(r=inrad, $fn=70); } rotate(alpha) scale(outrad*2) { FArcSegment_mask(delta); } } } } tubeslop = 0.5; tubeheight = 30 + tubeslop; tubewidth = 15 + tubeslop; mainthick = 4; clipthick = 2; clipang = 135; stemlen = 40; topwidth = 20; hookinrad = 7.5; hookcurl = 60; hookwidth = 4; tuberad = tubewidth/2; bend = atan(tuberad/stemlen); mainoutrad = tuberad + mainthick; hookoutrad = hookinrad + hookwidth; hookcy = -(stemlen - hookoutrad); eltop = [topwidth/2, -tuberad + tubeheight + mainthick + 0.1]; elmid = [topwidth/2, -tuberad]; ellow = tangent_intersect_b([0,hookcy], hookinrad, elmid); ellowextra = 180 - tangent_intersect_beta([0,hookcy], hookinrad, elmid); module ClipPlan(qbend, qstemleny){ dy = tubeheight - tuberad*2; FArcSegment(0, dy, tuberad, mainoutrad, -1, 181); FArcSegment(0, 0, tuberad, mainoutrad, -qbend, qbend+1); translate([tuberad, 0]) square(center=false, size=[mainthick,dy]); FArcSegment(0, 0, tuberad, tuberad + clipthick, 360-clipang, clipang+1); rotate(-qbend) translate([tuberad, 0]) mirror([0,1]) square(center=false, size=[mainthick, qstemleny/cos(qbend)]); } module Plan(){ ClipPlan(bend,stemlen); } module ElevationCore(){ FArcSegment(0, hookcy, hookinrad, hookoutrad, 180 - ellowextra, 90 + hookcurl + ellowextra); translate([-hookoutrad*sqrt(0.5), hookcy - hookoutrad*sqrt(0.5) + 0.1]) mirror([1,0]) square(center=false, size=[topwidth, stemlen + tubeheight + 20]); polygon([[-hookoutrad, ellow[1]], reflect_in_y(eltop), eltop, elmid, ellow]); } // after here is all 3D module Primary(){ intersection(){ translate([0,0, -(topwidth+10)/2]) linear_extrude(height=topwidth+10) Plan(); translate([50,0]) rotate([0,-90,0]) linear_extrude(height=100) ElevationCore(); } } module PlaneAbove(){ translate([-100,-100,0]) cube(center=false,size=[200,200,200]); } taperangle = -270 + tangent_intersect_beta([-hookcy, 0], hookoutrad, [-eltop[1], -eltop[0]]); module HookL(){ ////toplevel difference(){ rotate([taperangle,0,0]) translate([0,-eltop[1],0]) Primary(); translate([0,0,topwidth/2]) rotate([taperangle*2,0,0]) PlaneAbove(); translate([0,0,-topwidth/2]) mirror([0,0,1]) PlaneAbove(0); } } // straight-on version, everything prefixed with s or S shookcy = -(stemlen-hookoutrad); sstemleny = -shookcy; sbend_raw = tangents_intersect_beta([0,0],tuberad, [0,shookcy],hookinrad); sbend = angle_map_range(360-sbend_raw, -180); module SPlan(){ ClipPlan(sbend, sstemleny); FArcSegment(0,shookcy, hookinrad,hookoutrad, 270 - hookcurl, hookcurl + 90 - sbend); } module SElevation(){ boty = shookcy - hookoutrad - 1; polygon([[-1, tubeheight], [topwidth, tubeheight], [topwidth, elmid[1]], [hookwidth, shookcy], [hookwidth, boty], [-1, boty]]); } module SElevationPlaced(){ rotate([0,-90,0]) translate([0,0,-100]) linear_extrude(height=200) SElevation(); } module SHookL(){ ///toplevel intersection(){ linear_extrude(height=topwidth) SPlan(); SElevationPlaced(); } } // straight-on version, reversed, everything prefixed with t or T tjoinrad = mainoutrad * 0.7; tstem0leny = tuberad - tjoinrad*0.5; tjoinoutrad = tjoinrad + mainthick; thookcy = shookcy; tjoin0c = [tuberad - tjoinrad, -tstem0leny]; tjoin1c = [0, thookcy]; tbend_raw = tangents_intersect_beta(tjoin0c, tjoinrad, tjoin1c, -hookoutrad); tbend0 = angle_map_range(tbend_raw, 0); tbend1 = angle_map_range(tbend_raw + 180, -180); tbend0p = circle_point(tjoin0c, tjoinrad, tbend_raw); tbend1p = circle_point(tjoin1c, -hookoutrad, tbend_raw); module TPlan(){ ClipPlan(0, tstem0leny); FArcSegment(tjoin0c[0],tjoin0c[1], tjoinrad,tjoinoutrad, tbend0, 360-tbend0); FArcSegment(0,shookcy, hookinrad,hookoutrad, tbend1, 270+hookcurl - tbend1); translate(tbend0p) { rotate(tbend_raw+180) mirror([1,0]) { translate([0,-0.1]) square(size=[mainthick, dist2d(tbend0p,tbend1p)+0.2]); } } } module THookR(){ ///toplevel intersection(){ linear_extrude(height=topwidth) TPlan(); SElevationPlaced(); } } // other toplevels etc. module HookR(){ ////toplevel mirror([1,0,0]) HookL(); } module SHookR(){ ////toplevel mirror([1,0,0]) SHookL(); } module THookL(){ ////toplevel mirror([1,0,0]) THookR(); } module Demo(){ ////toplevel translate([-30,tubeheight,0]) HookL(); translate([ 0,tubeheight,0]) HookR(); translate([ 30, 0,0]) SHookL(); translate([ 60, 0,0]) SHookR(); translate([ 90, 0,0]) THookL(); translate([120, 0,0]) THookR(); }