20 mountscrew_dia = 4 + 0.5;
21 clipbolt_dia = 5 + 0.5;
30 tube_or = tube_dia/2 + tube_th;
31 back_ohw = back_gap/2 + backflange_th;
32 backflange_ymin = tube_or+backflange_d;
34 lock_0y = tube_dia/2 + lock_d/2 + midweb_d;
36 lock_or = [lock_w, lock_d]/2 + [front_th,front_th];
38 module oval(sz){ // sz[0] > sz[1]
43 translate([sx * (xr-yr), 0])
53 translate([-back_ohw,0]) mirror([0,1])
54 square([back_ohw*2, backflange_ymin]);
56 circle(r = tube_dia/2);
57 translate([-back_gap/2,1]) mirror([0,1])
58 square([back_gap, backflange_ymin+2]);
60 translate([0, lock_0y]){
65 oval([lock_w/2, lock_d/2]);
70 lockshaft_or = lockshaft_r + [clip_th,clip_th];
71 cliprecess_ymax = cliprecess_h - lockshaft_r[1];
72 clip_ymin = cliprecess_ymax - total_h;
73 clip_ogap = clip_gap + clip_th*2;
75 module ClipElevationPositive(){
77 translate([-lockshaft_or[0], 0])
78 square([lockshaft_or[0]*2, cliprecess_ymax]);
79 translate([-clip_ogap/2, 0]) mirror([0,1]) square([clip_ogap, -clip_ymin]);
82 module ClipElevationNegative(){
84 for (y=[0, cliprecess_ymax+1])
88 translate([-clip_gap/2, 1]) mirror([0,1]) square([clip_gap, 2-clip_ymin]);
91 module ClipElevation(){
93 ClipElevationPositive(1);
94 ClipElevationNegative(0);
98 module ExtrudeClipElevation(extra=0){
100 lock_0y + lock_d/2 + clip_d + extra,
103 linear_extrude(height= clip_d + extra*2, convexity=100)
107 module ThroughHole(r, y, z) {
108 translate([-50, y, z])
110 cylinder(r=r, h=100, $fn=20);
113 module ThroughHoles(){
114 for (z=[ 1/4, 3/4 ]) {
115 ThroughHole( mountscrew_dia/2,
116 -tube_or -0.5*backflange_d,
120 ThroughHole( clipbolt_dia/2,
121 lock_0y + lock_d/2 + clip_d/2,
122 total_h - cliprecess_h - clip_th - clip_d/2 );
125 module MainPositive(){
128 linear_extrude(height=total_h, convexity=100) MainPlan();
129 ExtrudeClipElevation() ClipElevationPositive();
131 ExtrudeClipElevation(1) ClipElevationNegative();