catch_knob_dia = 6;
catch_knob_above_gap = 8;
-catch_stem_end_h = 12;
catch_pin_height = 7;
catch_stem_below_gap = 1.0;
catch_stem_beside_gap = 2.0;
catch_pin_gap = 0.5;
+catch_hook_slope = 0.15;
// calculated
catch_cr = catch_knob_dia/2 + catch_stem_beside_gap;
catch_strap_width = sm_main_width;
-
-cpp0 = [0,0];
+catch_strap_thick = sm_main_thick;
+catch_stem_end_h = catch_stem_h;
+catch_pin_width = rivet_entry_width - catch_pin_gap;
+
+cppy6 = -catch_strap_width/2;
+cppxC = 0.34 * sm_inner_rad * TAU;
+cppB = [ catch_pin_width/2,
+ cppy6
+ + catch_stem_below_gap
+ + catch_pin_height
+ + catch_knob_dia/2 ];
+cpp0 = [ 0,
+ cppB[1]
+ + catch_knob_dia
+ + catch_knob_above_gap ];
+cpp12 = cpp0 + [1,0] * (catch_pin_height * catch_hook_slope);
cpp1 = cpp0 + [0,1] * catch_pin_height;
-cpp2 = cpp0 + [1,0] * (rivet_entry_width - catch_pin_gap);
-cpp3 = cpp2 + [0,-1] * catch_stem_end_h;
-cpp4 = cpp2 + [0,-1] * catch_stem_end_h;
+cpp2 = cpp1 + [1,0] * catch_pin_width;
+cpp4 = cpp0 + [0,-1] * catch_stem_end_h;
+cpp3 = [ cpp2[0], cpp4[1] ];
cpp5 = [ cpp0[0] - catch_stem_len,
- cpp0[1] - (catch_stem_h + catch_cr) ];
-cppB = [ 0.5*(cpp1 + cpp2)[0],
- cpp1[1] - catch_pin_height - catch_knob_above_gap -
- 0.5 * catch_knob_dia ];
-cpp7 = cppB + [-1,-1] * catch_knob_dia/2
+ -catch_stem_h ];
+cpp6 = [ cpp5[0], catch_cr ];
+cpp7 = cppB + [1,-1] * catch_knob_dia/2
+ [ catch_stem_beside_gap, -catch_stem_below_gap ]
+ [ 0, -catch_pin_height ]
+ [-1,1] * catch_cr;
-cpp6 = [ cpp5[0], cpp7[1] ];
-cpp8 = [ cpp7[0] + catch_cr*2,
- cpp0[0] - catch_cr ];
-cppC = cpp8 + [1,1] * catch_cr;
-cppA = [ cpp5[0] - catch_cr*2, cpp0[1] ];
+cpp11 = cpp7 + [1,0] * catch_cr;
+cpp10 = [ cpp11[0], 0 - catch_cr ];
+cpp8 = cpp10 + [1,0] * catch_cr;
+cpp9 = cpp8 + [0,1] * catch_cr;
+cppC = [ cppxC, cpp9[1] ];
+cppA = [ -cppxC, 0 ];
cppD = cppC + [0,-1] * catch_strap_width;
cppE = [ cppA[0], cppD[1] ];
ImplHeadCup();
}
+module SomeStrap(){
+ // children(0) is to add, (1) subtract
+ difference(){
+ union(){
+ cylinder(r=sm_outer_rad, h=sm_main_width);
+ StrapMountProtrusion(smc_cnr_c_x + sm_closure_cnr,
+ smc_max_y,
+ sm_closure_cnr);
+ children(0);
+ }
+ 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);
+ children(1);
+ }
+}
+
module StrapMountBolt(l_delta){ ///toplevel
// positioned relative to smc_pos
translate([(smc_bolt_nut_eff_thick - sm_bolt_head_thick)/2,
}
module StrapMount(){ ////toplevel
- difference(){
- union(){
- cylinder(r=sm_outer_rad, h=sm_main_width);
- StrapMountProtrusion(smc_cnr_c_x + sm_closure_cnr,
- smc_max_y,
+ SomeStrap(){
+ rotate([0,0,180]){
+ StrapMountProtrusion(strap_hoop_inside/2 + strap_hoop_thick,
+ strap_hoop_thick,
sm_closure_cnr);
- rotate([0,0,180]){
- StrapMountProtrusion(strap_hoop_inside/2 + strap_hoop_thick,
- strap_hoop_thick,
- sm_closure_cnr);
- translate(smc_pos +
- [0,0, sm_main_width] +
- strap_hoop_thick * [ 0, 0.5, -1.0 ])
- StrapHoop();
- }
+ translate(smc_pos +
+ [0,0, sm_main_width] +
+ strap_hoop_thick * [ 0, 0.5, -1.0 ])
+ StrapHoop();
}
- 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);
+ union(){ };
}
}
-module CatchCoreProfile(){
+module CatchCoreProfile(){ ////toplevel
+ hull(){
+ translate(cppB) circle(r= catch_knob_dia/2);
+ polygon([cpp4,
+ cppB,
+ cpp3]);
+ }
+ translate(cpp8)
+ circle(catch_cr);
+ polygon([
+ cpp4,
+ cppB,
+ cpp3,
+ cpp2,
+ cpp1,
+ cpp12,
+ ]);
difference(){
polygon([ cpp4,
cpp3,
- cpp2,
- cpp1,
- cpp0,
+ cpp12,
cppA,
cppE,
cppD,
cppC,
- ]);
+ cpp9,
+ cpp10,
+ cpp11,
+ cpp7,
+ cpp5,
+ ], convexity=10);
+ hull(){
+ translate(cpp7) circle(r= catch_cr);
+ polygon([ cpp7,
+ cpp5,
+ cpp11 ]);
+ }
+ hull(){
+ translate(cpp6) circle(catch_cr);
+ polygon([ cppA,
+ cpp0,
+ cpp1 ]);
+ }
+ }
+}
+
+module CatchPreDistort(){ /////toplevel
+ scale(100 / sm_inner_rad)
+ rotate([90,0,0])
+ linear_extrude(height=catch_strap_thick, convexity=10)
+ CatchCoreProfile();
+}
+
+module CatchAssembly(){ /////toplevel
+ rotate([0,0, -0.5 * (cpp1[0] + cpp2[0]) / sm_inner_rad * 360/TAU])
+ translate([0,0, catch_strap_width])
+ scale(sm_inner_rad / 100)
+ import(str("poster-tube-lid,CatchPostDistort-fa",
+ (coarse ? 20 : 1),
+ ".stl"),
+ convexity=20);
+
+ SomeStrap(){
+ union(){ }
+ union(){
+ translate([-200, -200, -200])
+ cube([400, 200, 400]);
+ }
}
}