2 function ClipHook_r2(w,g,l,ye,k) = w/2 + g + w/2;
3 function ClipHook_r3(w,g,l,ye,k) = k * (ClipHook_r2(w,g,l,ye,k) + w + g);
4 function ClipHook_yd(w,g,l,ye,k) = g/2 + w + g + w/2 - ClipHook_r3(w,g,l,ye,k);
5 function ClipHook_xe(w,g,l,ye,k) =
7 sqrt(pow( ClipHook_r3(w,g,l,ye,k), 2) -
8 pow( ClipHook_yd(w,g,l,ye,k) - ye, 2));
10 module FlatArc(cx,cy,r1,r2,a1,a2=361,$fn=$fn) {
13 translate([cx,cy,0]) {
22 echo(" jarc ", a1,a2, astep, ai, a1 + astep*ai );
23 rotate(a1 + astep*ai) {
24 polygon([ [0,0], [1,0],
25 [cos(astep*2),sin(astep*2)] ]);
33 module ClipHook_2D(w,g,l,ye,k,h) {
34 r2 = ClipHook_r2(w,g,l,ye,k);
35 r3 = ClipHook_r3(w,g,l,ye,k);
36 yd = ClipHook_yd(w,g,l,ye,k);
37 xe = ClipHook_xe(w,g,l,ye,k);
43 alpha = atan2((xe-xd)/r3, (ye-yd)/r3);
45 echo("ClipHook(w g l ye k h) ", w, g, l, ye, k, h);
46 echo("ClipHook r2 r3 xd yd xe =", r2,r3, xd,yd, xe);
50 module jcirc(x,y) { translate([x,y,0]) circle(r=w/2); }
51 module jbox(y,x1,x2) { translate([x1,y-w/2,0]) square(size=[x2-x1, w]); }
52 module jarc(cx,cy,r,a1=0,a2=360) { FlatArc(cx,cy,r-w/2,r+w/2,a1,a2); }
56 jarc(xc, yc, r2, 90, 270);
58 jarc(xd, yd, r3, 90-alpha, 90);
62 module ClipHook(w=1.2, g=0.2, l=0.0, ye=0, k=2.0, h=3.5, demo=false,
63 cupcaph=0, cupgapg=0) {
65 linear_extrude(height=h)
66 ClipHook_2D(w,g,l,ye,k);
68 translate([-g+0.01,-(w+g),h-cupcapg])
69 cube([w,(w+g),cupcaph+1]);
73 translate([-l/2, g/2+w/2, h-0.01])
75 cylinder(r=ClipHook_r2(w,g,l,ye,k)+w*0.4, h=cupcaph, $fn=16);
76 translate([-50-g,-50,-1]) cube([50,100,h+2]);
82 ClipHook(l=0, k=1, cupcaph=1, cupcapg=0.4);
83 %translate([l+w,0,0]) rotate(180) ClipHook(l=0, k=1, cupcaph=1, cupcapg=0.4);