pin-hinge: wip

[reprap-play.git] / pin-hinge.scad

diff --git a/pin-hinge.scad b/pin-hinge.scad
index 9fa22de01e7866a11a728bf0befdf84b9e529301..c17ce811dfeaa01c09929f38b4947e4fce2a7e6b 100644 (file)
--- a/pin-hinge.scad
+++ b/pin-hinge.scad
@@ -1,8 +1,11 @@
 // -*- C -*-
 
+include <utils.scad>
+
 $hinge_pin_dia = 0.795 + 0.35;
 $hinge_main_dia = 4.0;
 $hinge_inter_gap = 0.50;
+$hinge_prong_minwidth = 3.0;
 $hinge_noncrit_gap = 1.0;
 
 $fa = 3;
@@ -13,14 +16,11 @@ module HingePinPlan(){
 }
 
 module HingeProngPlan(behind){
-  difference(){
-    hull(){
-      circle(r= $hinge_main_dia/2);
-      polygon([[0,0],
-              [-$hinge_main_dia/2, -behind],
-              [+$hinge_main_dia/2, -behind]]);
-    }
-    HingePinPlan();
+  hull(){
+    circle(r= $hinge_main_dia/2);
+    polygon([[0,0],
+            [-$hinge_main_dia/2, -behind],
+            [+$hinge_main_dia/2, -behind]]);
   }
 }
 
@@ -31,6 +31,34 @@ module HingeGapPlan() {
 module PlanDemo(){
   HingeProngPlan(5);
   %HingeGapPlan();
+  translate([0,0,1]) color("red") HingePinPlan();
+}
+
+module HingePositive(l, behind){
+  linextr_x_yz(0, l)
+    HingeProngPlan(behind);
+}  
+
+module HingeNegative(l){
+  eff_l = l + $hinge_inter_gap;
+  pairs = floor(eff_l / (2*($hinge_prong_minwidth + $hinge_inter_gap)));
+  stride = eff_l / pairs;
+  prong_width = stride/2 - $hinge_inter_gap;
+  linextr_x_yz(-0.1, l+0.1)
+    HingePinPlan();
+  for (i=[0:pairs-1]) {
+    translate(stride * i * [1,0,0])
+      linextr_x_yz(0 + (i==0 ? -0.1 : 0), prong_width + $hinge_inter_gap)
+      HingeGapPlan();
+  }
+}
+
+module Demo(){
+  difference(){
+    HingePositive(30, 10);
+    %HingeNegative(30);
+  }
 }
 
-PlanDemo();
+//PlanDemo();
+Demo();