20 mountscrew_dia = 4 + 0.5;
21 clipbolt_dia = 5 + 0.5;
27 tube_or = tube_dia/2 + main_th;
28 back_ohw = back_gap/2 + main_th;
29 backflange_ymin = tube_or+backflange_d;
31 lock_0y = tube_dia/2 + lock_d/2 + midweb_d;
33 lock_or = [lock_w, lock_d]/2 + [front_th,front_th];
35 module oval(sz){ // sz[0] > sz[1]
40 translate([sx * (xr-yr), 0])
50 translate([-back_ohw,0]) mirror([0,1])
51 square([back_ohw*2, backflange_ymin]);
53 circle(r = tube_dia/2);
54 translate([-back_gap/2,1]) mirror([0,1])
55 square([back_gap, backflange_ymin+2]);
57 translate([0, lock_0y]){
62 oval([lock_w/2, lock_d/2]);
67 lockshaft_or = lockshaft_r + [clip_th,clip_th];
68 cliprecess_ymax = cliprecess_h - lockshaft_r[1];
69 clip_ymin = cliprecess_ymax - total_h;
70 clip_ogap = clip_gap + clip_th*2;
72 module ClipElevationPositive(){
74 translate([-lockshaft_or[0], 0])
75 square([lockshaft_or[0]*2, cliprecess_ymax]);
76 translate([-clip_ogap/2, 0]) mirror([0,1]) square([clip_ogap, -clip_ymin]);
79 module ClipElevationNegative(){
81 for (y=[0, cliprecess_ymax+1])
85 translate([-clip_gap/2, 1]) mirror([0,1]) square([clip_gap, 2-clip_ymin]);
88 module ClipElevation(){
90 ClipElevationPositive(1);
91 ClipElevationNegative(0);
95 module ExtrudeClipElevation(extra=0){
97 lock_0y + lock_d/2 + clip_d + extra,
100 linear_extrude(height= clip_d + extra*2, convexity=100)
104 module ThroughHole(r, y, z) {
105 translate([-50, y, z])
107 cylinder(r=r, h=100, $fn=20);
110 module ThroughHoles(){
111 for (z=[ 1/4, 3/4 ]) {
112 ThroughHole( mountscrew_dia/2,
113 -tube_or -0.5*backflange_d,
117 ThroughHole( clipbolt_dia/2,
118 lock_0y + lock_d/2 + clip_d/2,
119 total_h - cliprecess_h - clip_th - clip_d/2 );
122 module MainPositive(){
125 linear_extrude(height=total_h, convexity=100) MainPlan();
126 ExtrudeClipElevation() ClipElevationPositive();
128 ExtrudeClipElevation(1) ClipElevationNegative();