topeak-mtx-tortec-expeditionrack-adapter: wip

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/topeak-mtx-tortec-expeditionrack-adapter.scad b/topeak-mtx-tortec-expeditionrack-adapter.scad
index ffb437ada7389abbb2adca65ffa2b615b1b72f75..e6e897deb63de145ece01ad734b1935e047f426a 100644 (file)
--- a/topeak-mtx-tortec-expeditionrack-adapter.scad
+++ b/topeak-mtx-tortec-expeditionrack-adapter.scad
@@ -16,12 +16,18 @@ rear_to_front_distance = 230;
 
 general_gap_y = 1.0;
 
-main_sz_z = 20; // xxx
+strap_w = 8.0;
+strap_th = 2.5;
+strap_barrel_dia = 8;
+
 main_sz_y = 20;
 grasp_sz = 12;
+beside_strap_sz = 8;
 
 // calculated
 
+main_sz_z = beside_strap_sz*2 + strap_w;
+
 brk_bottom_y = -brk_recess_actual;
 adapt_main_top_y = brk_bottom_y + general_gap_y;
 
@@ -72,16 +78,35 @@ module GraspFixingElevation(){
   }
 }
 
+module StrapBarrelElevation(){
+  translate([ rack_width_inner/2 + strap_barrel_dia/2,
+             $rack_rail_y + rack_rail_dia/2 + strap_barrel_dia/2 ])
+    circle(strap_barrel_dia/2);
+}
+
 module Principal(){
   // calculated
   $rack_rail_y = brk_bottom_y - $elevation_nominal
     - general_gap_y  - rack_rail_dia/2;
 
   difference(){
-    linextr(0, main_sz_z){
-      GraspElevation();
-      BlockElevation();
-      GraspFixingElevation();
+    union(){
+      linextr(0, main_sz_z){
+       GraspElevation();
+       BlockElevation();
+       StrapBarrelElevation();
+      }
+
+      difference(){
+       linextr(0, main_sz_z){
+         GraspFixingElevation();
+       }
+
+       translate([0,0, main_sz_z/2]) linextr(-strap_w/2, +strap_w/2) {
+         translate([ rack_width_inner/2 - strap_th, 0 ])
+           rectfromto([ 0, -50 ], [ 50, 50 ]);
+       }
+      }
     }
 
     linextr(-10, main_sz_z+10) {