From 6b1b3d09170023b4bfa7d5609645de45805849cb Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Fri, 23 Feb 2024 18:00:05 +0000
Subject: [PATCH] mudguard-bracket: wip

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
---
 mudguard-bracket.scad | 45 +++++++++++++++++++++++++++++++++++++------
 1 file changed, 39 insertions(+), 6 deletions(-)

diff --git a/mudguard-bracket.scad b/mudguard-bracket.scad
index 52f654c..bded91b 100644
--- a/mudguard-bracket.scad
+++ b/mudguard-bracket.scad
@@ -10,11 +10,29 @@ wings_inner_th = 1;
 wings_main_th = 2.5;
 wings_cup_z = -34;
 
+tubeswidth_top = 23.5;
+tubeswidth_bot = 29;
+tubeswidth_dz = 26;
+tube_dia = 18;
+screw_hole_z = 13;
+
+beamacross_h = 15;
+
 $fs = 0.1;
 $fa = 3;
 
 // calculated
 
+function tubeswidth_at_z(z) =
+  tubeswidth_bot +
+  (tubeswidth_top - tubeswidth_bot) * (z / tubeswidth_dz);
+
+bracket_bot_z = screw_hole_z - beamacross_h/2;
+bracket_top_z = screw_hole_z + beamacross_h/2;
+bracket_bot_xsz = tubeswidth_at_z(bracket_bot_z) + tube_dia * 1.5;
+bracket_top_xsz = tubeswidth_at_z(bracket_top_z) + tube_dia * 1.5;
+
+wing_top_ea_x = -bracket_top_xsz/2 + wings_main_th/2;
 
 module AtWingCupElevation () {
   translate([ -wings_dist_x, wings_cup_z ])
@@ -54,17 +72,32 @@ module WingCupElevationPositive () {
 }
 
 module WingElevation(){
-  AtWingCupElevation(){
-    translate([ -(wings_inner_th + wings_main_th)/2,
-		wings_cup_inner/2 ])
-      circle(r = wings_main_th);
+  hull(){
+    AtWingCupElevation(){
+      translate([ -(wings_inner_th + wings_main_th)/2,
+		  wings_cup_inner/2 ])
+	circle(r = wings_main_th);
+    }
+    // TODO add the other end here
+  }
+}
+
+module BracketAcrossElevation(){
+  hull(){
+    translate([ 0, bracket_bot_z ])
+      rectfromto([ -bracket_bot_xsz/2, 0 ],
+		 [ +bracket_bot_xsz/2, 1 ]);
+    translate([ 0, bracket_top_z ])
+      rectfromto([ -bracket_top_xsz/2, -1 ],
+		 [ +bracket_top_xsz/2, 0 ]);
   }
 }
 
-module WingCupElevationDemo(){
+module ElevationDemo(){
   translate([0,0,2]) color("red") WingCupElevationNegative();
   translate([0,0,1]) color("blue") WingElevation();
   WingCupElevationPositive();
+  BracketAcrossElevation();
 }
 
 /*WingsElevation () {
@@ -75,4 +108,4 @@ module WingCupElevationDemo(){
 
 */
 
-WingCupElevationDemo();
+ElevationDemo();
-- 
2.30.2