20 mountscrew_dia = 4 + 0.5;
21 clipbolt_dia = 5 + 0.5;
29 lockshaft_r = [1, 1] * lockshaft_dia / 2;
33 tube_or = tube_dia/2 + tube_th;
34 back_ohw = back_gap/2 + backflange_th;
35 backflange_ymin = tube_or+backflange_d;
37 lock_0y = tube_dia/2 + lock_d/2 + midweb_d;
39 lock_or = [lock_w, lock_d]/2 + [front_th,front_th];
41 module oval(sz){ // sz[0] > sz[1]
46 translate([sx * (xr-yr), 0])
56 translate([-back_ohw,0]) mirror([0,1])
57 square([back_ohw*2, backflange_ymin]);
59 circle(r = tube_dia/2);
60 translate([-back_gap/2,1]) mirror([0,1])
61 square([back_gap, backflange_ymin+2]);
63 translate([0, lock_0y]){
68 oval([lock_w/2, lock_d/2]);
73 lockshaft_or = lockshaft_r + [clip_th,clip_th];
74 cliprecess_ymax = cliprecess_h - lockshaft_r[1];
75 clip_ymin = cliprecess_ymax - total_h;
76 clip_ogap = clip_gap + clip_th*2;
78 module ClipElevationPositive(){
81 translate([0, -lockshaft_or[1] * sqrt(2)])
82 square(center=true, 0.5);
84 translate([-lockshaft_or[0], 0])
85 square([lockshaft_or[0]*2, cliprecess_ymax]);
86 translate([-clip_ogap/2, 0]) mirror([0,1]) square([clip_ogap, -clip_ymin]);
89 module ClipElevationNegative(){
91 for (y=[0, cliprecess_ymax+1])
95 translate([-clip_gap/2, 1]) mirror([0,1]) square([clip_gap, 2-clip_ymin]);
98 module ClipElevation(){
100 ClipElevationPositive(1);
101 ClipElevationNegative(0);
105 module ExtrudeClipElevation(extra=0){
107 lock_0y + lock_d/2 + clip_d + extra,
110 linear_extrude(height= clip_d + extra*2, convexity=100)
114 module ThroughHole(r, y, z) {
115 translate([-50, y, z])
117 cylinder(r=r, h=100, $fn=20);
120 module ThroughHoles(){
121 for (z=[ 1/4, 3/4 ]) {
122 ThroughHole( mountscrew_dia/2,
123 -tube_or -0.5*backflange_d,
127 ThroughHole( clipbolt_dia/2,
128 lock_0y + lock_d/2 + clip_d/2 + front_th/2,
129 total_h - cliprecess_h - clip_th - clip_d/2 );
132 module MainPositive(){
135 linear_extrude(height=total_h, convexity=100) MainPlan();
136 ExtrudeClipElevation() ClipElevationPositive();
138 ExtrudeClipElevation(1) ClipElevationNegative();
150 //ClipElevationPositive();