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;
+catch_strap_thick = sm_main_thick;
catch_stem_end_h = catch_stem_h;
-
-cpp0 = [0,0];
+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 = cpp1 + [1,0] * (rivet_entry_width - catch_pin_gap);
+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,
- 0 - (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 ];
+ -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;
cpp11 = cpp7 + [1,0] * catch_cr;
-cpp6 = cpp5;
cpp10 = [ cpp11[0], 0 - catch_cr ];
cpp8 = cpp10 + [1,0] * catch_cr;
cpp9 = cpp8 + [0,1] * catch_cr;
-cppC = cpp8 + [1,1] * catch_cr;
-cppA = [ cpp5[0] - catch_cr*2, 0 ];
+cppC = [ cppxC, cpp9[1] ];
+cppA = [ -cppxC, 0 ];
cppD = cppC + [0,-1] * catch_strap_width;
cppE = [ cppA[0], cppD[1] ];
}
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,
cpp9,
cpp10,
cpp11,
- cpp6,
+ 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();
+}
+
//ProfilesDemo();
//BayonetCutout();
//MainProfile();