X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=filamenttrestle.scad;h=924135230e684cd1c6b69d23ee08cdcbf987a488;hp=fac82b7f3c95e5e614a69100d7e4075fb8d0557e;hb=a29c73bb71de340433ee51a5ed92c04a39ea67ea;hpb=5476e5ba105673b154b43445d884cafb28d875fa

diff --git a/filamenttrestle.scad b/filamenttrestle.scad
index fac82b7..9241352 100644
--- a/filamenttrestle.scad
+++ b/filamenttrestle.scad
@@ -1,6 +1,8 @@
 // -*- C -*-
 
 spoolwidth = 80; // fixme needs to be measured
+trestleheight = 80; // fixme needs to be checked
+trestlebase = 80; // fixme needs to be checked
 
 include <doveclip.scad>
 
@@ -9,10 +11,48 @@ barrady = 5;
 barradz = 7;
 guidewidth = 3;
 guiderad = 20;
-clipdepth = 16;
-clipcount = 3;
 
-module Bar(){
+legw = 12;
+plugl = 20;
+plugwmin = 3;
+plugh = 10;
+plugslope = 0.5;
+plugwmax = plugwmin + plugh * plugslope * 2;
+
+trestlelegw = 10;
+trestlebaseh = 10;
+trestleplugd = 1;
+
+topblockthick = 4;
+topblockbasedepth = 5;
+
+pinbasew = 5.0;
+pinminh = 1.5;
+pinmaxh = 4.5;
+pindh = 0.50;
+pindwidth = 0.75;
+
+pintaperlen = plugwmax * 0.85;
+pinstraightlen = 10;
+
+module Plug(d=0){
+  dw = d;
+  dh = d;
+  dhb = d*2;
+  a = atan(plugslope);
+  bdy = -dhb;
+  bdx = dw / cos(a) + bdy * plugslope;
+  tdy = dh;
+  tdx = bdx + tdy * plugslope;
+  translate([-d,0,0]) rotate([90,0,90]) linear_extrude(height=plugl+0.1+d*2){
+    polygon([[-(plugwmin/2 + bdx),  bdy],
+	     [-(plugwmax/2 + tdx),  plugh + tdy],
+	     [+(plugwmax/2 + tdx),  plugh + tdy],
+	     [+(plugwmin/2 + bdx),  bdy]]);
+  }
+}
+
+module Bar(){ ////toplevel
   spoolw = spoolwidth + spoolwidthgap*2;
   barz = barradz * 0.5;
   biggestw = spoolw + 50;
@@ -26,11 +66,8 @@ module Bar(){
 	  translate([spoolw/2,0,0])
 	    rotate([0,90,0]) cylinder(r=guiderad, h=guidewidth, $fn=60);
 	}
-	translate([spoolw/2 + guidewidth +
-		   DoveClipPairSane_width(clipcount)/2 - 0.1,
-		   clipdepth/2, -0.01])
-	  rotate([90,90,0])
-	    DoveClipPairSane(h=clipdepth, count=clipcount, baseextend=barrady);
+	translate([spoolw/2 + guidewidth, 0, 0])
+	  Plug();
       }
     }
     translate([-biggestw/2, -50, 0])
@@ -38,4 +75,100 @@ module Bar(){
   }
 }
 
-Bar();
+module Trestle(){ ////toplevel
+  legang = atan2(trestlebase/2, trestleheight);
+  eplen = sqrt(trestleheight*trestleheight + trestlebase*trestlebase*0.25);
+  topblockw = plugwmax + trestleplugd*2 + topblockthick*2;
+
+  pinholebasew = pinbasew + pindwidth*2;
+  pinholeh =     pinmaxh +  pindh;
+
+  difference(){
+    union(){
+      for (mir=[0,1]) {
+	mirror([mir,0,0]) {
+	  rotate([0,0, -90-legang])
+	    ExtenderPillars(length=eplen+trestlelegw,
+			    width=trestlelegw,
+			    height=legw,
+			    baseweb=true);
+
+	  translate([-trestlebase/2, -trestleheight, 0])
+	    cylinder(r=trestlelegw/2*1.2, h=plugl);
+	}
+      }
+      translate([-topblockw/2, -topblockbasedepth, 0])
+	cube([topblockw,
+	      topblockbasedepth + plugh + topblockthick
+	      + (pinmaxh - pinminh)*0.6 + pindh,
+	      plugl]);
+
+      translate([-trestlebase/2, -trestleheight, 0])
+	ExtenderPillars(length=trestlebase, width=trestlebaseh*2, height=legw);
+    }
+    translate([-300, -trestleheight-50, -1])
+      cube([600, 50, plugl+2]);
+
+    rotate([-90,-90,0])
+      Plug(d=trestleplugd);
+
+    for (rot=[0,180]) {
+      translate([0,0,plugl/2]) rotate([0,rot,0]) translate([0,0,-plugl/2]) {
+	translate([-(topblockw*0.25+1),
+ 	           plugh + pindh - (pinmaxh - pinminh)*0.75,
+		   (plugl - pinholebasew*2)/3]) {
+	  translate([0,0,pinholebasew/2]) rotate([-90,0,0]) %Pin();
+	  rotate([0,90,0]) {
+	    linear_extrude(height = topblockw*1.0+2) {
+	      polygon([[-1.0 * pinholebasew, -0.01],
+		       [-0.5 * pinholebasew, pinholeh],
+		       [ 0                 , -0.01]]);
+	    }
+	  }
+	}
+      }
+    }
+  }
+}
+
+module Pin(){ ////toplevel
+  rotate([90,0,90]) {
+    hull(){
+      for (mir=[0,1]) {
+	mirror([mir,0,0]) {
+	  linear_extrude(height=0.1) {
+	    polygon([[-0.01, 0],
+		     [-0.01, pinminh],
+		     [pinbasew*0.5*(pinminh/pinmaxh), 0]]);
+	  }
+	  translate([0,0,pintaperlen])
+	    linear_extrude(height=pinstraightlen) {
+	    polygon([[-0.01, 0],
+		     [-0.01, pinmaxh],
+		     [pinbasew*0.5, 0]]);
+	  }
+	}
+      }
+    }
+  }
+}
+
+module TestKit(){ ////toplevel
+  translate([30,0,0]) Pin();
+  translate([30,30,0]) Pin();
+  translate([0,40,0]) intersection(){
+    Trestle();
+    translate([-50,-10,-1]) cube([100,100,100]);
+  }
+  intersection(){
+    translate([-60,0,0]) Bar();
+    cube(50,center=true);
+  }
+}
+
+//Bar();
+//Trestle();
+//Pin();
+//TestKit();
+//Plug(d=1);
+//ExtenderPillars(80,12,8, baseweb=true);