sm_bolt_head_thick = 2.14;
sm_bolt_nut_width = 5.89 + 0.25;
sm_bolt_nut_thick = 3.68;
+sm_bolt_tighten_allow = 2.0;
sm_bolt_y_clear = 0.5;
sm_bolt_y_over = 0.5;
handling_dia = oring_bore + oring_thick*2 + min_wall*2;
handling_angle = 45;
-sm_inner_rad = sm_inner_circum / TAU;
+sm_inner_rad = (sm_inner_circum + sm_bolt_tighten_allow/2) / TAU;
sm_outer_rad = sm_inner_rad + sm_main_thick;
smc_pos = [ 0, sm_inner_rad, 0 ];
smc_bolt_nut_dia = sm_bolt_nut_width / cos(30);
+smc_bolt_nut_eff_thick = sm_bolt_nut_thick + sm_bolt_tighten_allow;
smc_bolt_y = sm_bolt_dia/2 + sm_bolt_y_clear;
smc_max_y = smc_bolt_y + sm_bolt_y_over
+ max(sm_bolt_head_dia/2, smc_bolt_nut_dia/2);
smc_cnr_c_x = sm_bolt_shaft/2 - sm_closure_cnr
- - max(sm_bolt_head_thick, sm_bolt_nut_thick);
+ + sm_bolt_head_thick/2 + smc_bolt_nut_eff_thick/2;
$fs= coarse ? 2.5 : 0.5;
$fa= coarse ? 5 : 1;
}
}
-module StrapMountBolt(){ ///toplevel
+module StrapMountBolt(l_delta){ ///toplevel
// positioned relative to smc_pos
+ translate([(smc_bolt_nut_eff_thick - sm_bolt_head_thick)/2,
+ smc_bolt_y,
+ sm_main_width/2]){
+ translate([ -sm_bolt_shaft/2-1, 0,0 ]){
+ rotate([0,90,0]) cylinder(r= sm_bolt_dia/2, h= sm_bolt_shaft+2);
+ }
+ translate([ -sm_bolt_shaft/2, 0,0 ])
+ rotate([0,-90,0])
+ cylinder($fn=6, r=smc_bolt_nut_dia/2,
+ h=smc_bolt_nut_eff_thick + l_delta);
+ translate([ sm_bolt_shaft/2, 0,0 ])
+ rotate([0,90,0])
+ cylinder(r=sm_bolt_head_dia/2, h=sm_bolt_head_thick + l_delta);
+ }
+}
+
+module StrapMountProtrusion(half_x, max_y, cnr){
+ translate(smc_pos){
+ linear_extrude(height=sm_main_width, convexity=10){
+ hull(){
+ for (m = [0,1]) mirror([m,0,0]) {
+ translate([-(half_x - cnr), max_y - cnr])
+ circle(r=cnr);
+ translate([-half_x, -sm_inner_rad])
+ square([1,1]);
+ }
+ }
+ }
+ }
}
module StrapMount(){ ////toplevel
difference(){
union(){
cylinder(r=sm_outer_rad, h=sm_main_width);
- translate(smc_pos){
- linear_extrude(height=sm_main_width, convexity=10){
- hull(){
- for (m = [0,1]) mirror([m,0,0]) {
- translate([-smc_cnr_c_x, smc_max_y - sm_closure_cnr])
- circle(r=sm_closure_cnr);
- translate([-smc_cnr_c_x, -sm_inner_rad])
- square([1,1]);
- }
- }
- }
- }
+ StrapMountProtrusion(smc_cnr_c_x + sm_closure_cnr,
+ smc_max_y,
+ sm_closure_cnr);
}
translate([0,0,-1])
cylinder(r=sm_inner_rad, h=sm_main_width+2);
+ translate(smc_pos)
+ StrapMountBolt(10);
+ translate(smc_pos)
+ cube([ sm_bolt_tighten_allow, 40,100 ], center=true);
}
}