X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=doveclip.scad;h=d336fc5aa91633c1d482ad0e78cedb94864b73ba;hp=cc2a02bcacd12c1554f66afae98bd6d78636e137;hb=4107a824f9108a3a4903f94f117219937550dc15;hpb=4dbc80ccc15f7880d408d9749c178b4fe759faae

diff --git a/doveclip.scad b/doveclip.scad
index cc2a02b..d336fc5 100644
--- a/doveclip.scad
+++ b/doveclip.scad
@@ -76,27 +76,57 @@ module DoveClipPairSane(baseextend=0, h=7, count=2) {
 function DoveClipPairSane_width(count=2) =
   2 * (nomrad + jawthick + ((nomrad*2 + jawthick) * (count-1)/2));
 
+module ExtenderPillars(length, width, height,
+		       pillarw=3.5, pillarslope=0.75, webthick=1) {
+  pillarr=pillarw/2;
+  pilesw = width - pillarw;
+  d = 0.25;
+
+  intangle = atan(pillarslope);
+  polyjx = sin(intangle)*pillarr;
+  polyjy = cos(intangle)*pillarr;
+  polyex = -tan(intangle+90)*pillarr;
+  webmidy = height/2+d;
+
+  for (ymir=[0,1]) mirror([0,ymir,0]) translate([0,-pilesw/2,0]) {
+      for (xmir=[0,1])
+	translate([0,0,height/2]) mirror([0,0,xmir])
+	  translate([0,0,-height/2]) {
+	  intersection() {
+	    translate([-1, -pillarr-5, 0.01])
+	      cube([length+2, height+pillarr*2+10, pilesw]);
+	    mirror([1,0,0]) rotate([0,-90,0])
+	      linear_extrude(height=length) 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]]);
+	    }
+	  }
+	}
+    }
+}
+
 module DoveClipExtender(length, ha=7, hb=7, counta=2, countb=2,
-			pillarw=3, pillarh=6, webthick=1) {
+			pillarw=3.5, pillarslope=0.75, webthick=1) {
+
   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;
+
+  pilesw = min(DoveClipPairSane_width(counta), DoveClipPairSane_width(countb))
+    - 0.5;
   pilesh = min(ha, hb) - 0.5;
-  d = 0.25;
+
   echo(pilesh);
-  translate([DoveClip_depth() - 1, 0, 0]) {
-    for (mir=[0,1]) mirror([0,mir,0]) translate([0,-pilesw/2,0]) {
-      mirror([1,0,0]) rotate([0,-90,0]) linear_extrude(height=pillarlen){
-	polygon([[0,0], [pillarh,0], [0,pillarw]]);
-	polygon([[pilesh,0], [pilesh-pillarh,0], [pilesh,pillarw]]);
-	polygon([[0,d], [0,webthick], [pilesh-d,webthick], [pilesh-d,0]]);
-      }
-    }
-  }
+
+  translate([DoveClip_depth() - 1, 0, 0])
+    ExtenderPillars(pillarlen, pilesw, pilesh,
+		    pillarw=pillarw, pillarslope=pillarslope,
+		    webthick=webthick);
 }
 
-//DoveClipExtender(length=100, ha=16, hb=12, counta=3, countb=4);
+//DoveClipExtender(length=100, ha=16, hb=20, counta=3, countb=4);