X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=salter-scale-hook.scad;h=3a8cfa354c0ca1642c4415a734a2b2da4251efec;hb=d7b0d240a8d8cf34c040e32dd7fcbc146a9bcc28;hp=025e54a97e9d99dcc1ef2e553959c2371129783f;hpb=665a2c6a2e65094bcbe29993dcbe269f2c2564d3;p=reprap-play.git

diff --git a/salter-scale-hook.scad b/salter-scale-hook.scad
index 025e54a..3a8cfa3 100644
--- a/salter-scale-hook.scad
+++ b/salter-scale-hook.scad
@@ -9,7 +9,8 @@ screw_head_dia = 8.2 + 1.0;
 rod_offset = 14 + 2;
 mainheight = 25;
 width = 40;
-rearthick = 3;
+rearthick = 4;
+screw_head_depth = 2;
 
 // calculated
 
@@ -19,6 +20,13 @@ ymin = yminc-thick/2;
 ymaxc = mainheight;
 ymax = mainheight+thick/2;
 
+cutdepth = rod_offset - rod_dia/2 - rearthick;
+
+cut_z0 = screw_head_dia/2;
+cut_z1 = width/2 - rearthick;
+
+cutslopez = cutdepth * 0.5;
+
 module C() {
   circle(r = thick/2, $fn=30);
 }
@@ -42,8 +50,13 @@ module Profile() {
 }
 
 module CutProfile(){
-  x = rod_dia/2 + rearthick;
-  rectfromto([x,yminc], [30,ymaxc]);
+  hull(){
+    for (x = [rod_dia/2 + thick/2, 30]) {
+      for (y= [yminc,ymaxc] ) {
+	translate([x,y]) circle(r = (thick-rearthick)/2, $fn=20);
+      }
+    }
+  }
 }
 
 module ProfileDemo(){
@@ -51,4 +64,45 @@ module ProfileDemo(){
   color("red") translate([0,0,1]) CutProfile();
 }
 
-ProfileDemo();
+module Cut(less){
+  translate([0,0, cut_z0 + less])
+    linear_extrude(height = cut_z1 - cut_z0 - less*2)
+    CutProfile();
+}
+
+module ScrewHole(){
+  xd =  (screw_head_dia-screw_dia)/2;
+  translate([0,0,-50])
+    cylinder(h=100, r= screw_dia/2, $fn=20);
+  hull(){
+    translate([0,0,-xd])
+      cylinder(h=1, r= screw_dia/2, $fn=50);
+    cylinder(h=20, r= screw_head_dia/2, $fn=50);
+  }
+}
+
+module Hook(){
+  difference(){
+    translate([0,0, -width/2])
+      linear_extrude(height=width) Profile();
+
+    for (m=[0,1]) {
+      mirror([0,0,m]) {
+	hull(){
+	  Cut(cutslopez);
+	  translate([cutdepth,0,0]) Cut(0);
+	}
+      }
+    }
+
+    translate([rod_dia/2 + screw_head_depth,
+	       ymaxc - screw_head_dia,
+	       0]) {
+      rotate([0,-90,0])
+	ScrewHole();
+    }
+  }
+}
+
+//ProfileDemo();
+Hook();