X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=doveclip.scad;h=db8d85c75dc5e3a8a7a4031c1407b710d8ad32ff;hp=589db5e5094d1df518365572d0e34a5a74c677a6;hb=ad602f0e94f6799569844990ca76b63108e90f96;hpb=2daba192f31dc1d70566a60cb25691f18304cbb3

diff --git a/doveclip.scad b/doveclip.scad
index 589db5e..db8d85c 100644
--- a/doveclip.scad
+++ b/doveclip.scad
@@ -32,10 +32,8 @@ module DoveClipPin(h=height) {
   }
 }
 
-function DoveClip_depth(baseextend) =
-  basethick + nomrad*2 + toothheight + baseextend;
-function DoveClip_width() =
-  nomrad*2 + jawthick*2 + toothgap;
+function DoveClip_depth() =
+  basethick + nomrad*2 + toothheight;
 
 module DoveClipEnd(baseextend=1, h=7) {
   cubex = nomrad*2 + jawthick*2;
@@ -52,25 +50,73 @@ module DoveClipEnd(baseextend=1, h=7) {
 }
 
 module DoveClipPair(baseextend=1, h=7) {
-  delta = DoveClip_width();
+  delta =  nomrad*2 + jawthick*2 + toothgap;
   for (x=[-delta/2,delta/2])
     translate([x,0,0])
       DoveClipEnd(baseextend=baseextend, h=h);
 }
 
-module DoveClipPairBase(baseextend=0.1, h=7) {
+module DoveClipPairBase(baseextend=0.1, h=7, count=2) {
   delta = nomrad*2 + jawthick;
   intrude = nomrad + basethick - basepinclear;
-  for (x=[-delta/2,delta/2]) {
-    translate([x,0,0])
+  for (i=[0:count-1]) {
+    translate([(i - (count-1)/2) * delta, 0, 0])
       DoveClipEnd(baseextend=baseextend, h=h);
   }
-  translate([-delta, -intrude, 0])
-    cube([delta*2, intrude+0.1, h]);
+  translate([-delta * count/2, -intrude, 0])
+    cube([delta * count, intrude+0.1, h]);
 }
 
-module DoveClipPairSane(baseextend=0, h=7) {
+module DoveClipPairSane(baseextend=0, h=7, count=2) {
   rotate([0,0,90])
-    translate([0, DoveClip_depth(baseextend=0), 0])
-    DoveClipPairBase(baseextend=baseextend, h=h);
+    translate([0, DoveClip_depth(), 0])
+    DoveClipPairBase(baseextend=baseextend, h=h, count=count);
+}
+
+function DoveClipPairSane_width(count=2) =
+  2 * (nomrad + jawthick + ((nomrad*2 + jawthick) * (count-1)/2));
+
+module DoveClipExtender(length, ha=7, hb=7, counta=2, countb=2,
+			pillarw=3.5, pillarslope=0.75, webthick=1) {
+  pillarr=pillarw/2;
+
+  mirror([1,0,0])
+    DoveClipPairSane(h=ha, count=counta);
+  translate([length,0,0])
+    DoveClipPairSane(h=hb, count=countb);
+  pillarlen = length - DoveClip_depth() * 2 + 2;
+  pilesw = min(DoveClipPairSane_width(counta), DoveClipPairSane_width(countb))
+    - 0.5 - pillarr*2;
+  pilesh = min(ha, hb) - 0.5;
+  d = 0.25;
+  echo(pilesh);
+
+  intangle = atan(pillarslope);
+  polyjx = sin(intangle)*pillarr;
+  polyjy = cos(intangle)*pillarr;
+  polyex = -tan(intangle+90)*pillarr;
+  webmidy = pilesh/2+d;
+
+  translate([DoveClip_depth() - 1, 0, 0]) {
+    for (ymir=[0,1]) mirror([0,ymir,0]) translate([0,-pilesw/2,0]) {
+	for (xmir=[0,1])
+	  translate([0,0,pilesh/2]) mirror([0,0,xmir])
+	      translate([0,0,-pilesh/2]) {
+	    intersection() {
+	      translate([-1, -pillarr-5, 0.01])
+		cube([pillarlen+2, pilesh+pillarr*2+10, pilesw]);
+	      mirror([1,0,0]) rotate([0,-90,0])
+		linear_extrude(height=pillarlen) union(){
+		  circle(r=pillarr, $fn=20);
+		  polygon([[polyjx,polyjy-0.1], [polyex, 0],
+			   [polyjx,-(polyjy-0.1)]]);
+		  polygon([[0,-webthick/2], [0,webthick/2],
+			   [webmidy,webthick/2], [webmidy,-webthick/2]]);
+	      }
+	    }
+	  }
+      }
+  }
 }
+
+DoveClipExtender(length=100, ha=16, hb=20, counta=3, countb=4);