From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 5 Nov 2022 00:13:05 +0000 (+0000)
Subject: topeak-mtx-tortec-expeditionrack-adapter: wip
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=commitdiff_plain;h=dd9e4ea9676f23a22f449907d5b288638f376a95;p=reprap-play.git

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 ffb437a..e6e897d 100644
--- 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) {