X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=tube-crossdrill-jig.scad;h=843a2a697123c8e10d87a0f882991cb80da2d8c2;hp=4293f5b002c7c82c7d0d96a227a01cfcf5de04a3;hb=6265c3f40931ce6df56d9b42a52a22342c93e65d;hpb=11bbae609be9e4520b1bc97b687f2be14131d8fc

diff --git a/tube-crossdrill-jig.scad b/tube-crossdrill-jig.scad
index 4293f5b..843a2a6 100644
--- a/tube-crossdrill-jig.scad
+++ b/tube-crossdrill-jig.scad
@@ -1,35 +1,58 @@
 // -*- C -*-
 
+//$fs=0.1;
+//$fa=3;
+$fs=0.2;
+$fa=6;
+
 rearwallthick = 3;
-basethick = 3;
+basethick = 2;
 mainframeendthick = 2.5;
 
-tubedia=16;
+tubedia = 16 + 0.8;
 tubetubethick=2;
 tubetubetopslop=1;
 
 boltholedia = 6.5 + 0.5;
+boltholeslotshorter = 6;
+mainframeholedia = 5 + 1.0;
 
 // "slot" refers to the things in the base of the drill press stand
-backslotedgespace = 71;
-slotwidth = 11.5;
+backslotedgespace = 59;
+slotwidth = 11.5 - 0.5;
 backslotmid2screwhole = 17;
 slotplugheight = 5.5;
-slotplugdepth = 10;
+slotplugshorterlen =10;
+slotpluglongerlen = 20;
+
+//slotslope = 11.0 / 18.5;
+slotslope = 1 / tan(51);
 
 // "keepslot" refers to the screws in the wooden jig block
 keepslotstartz = 20;
-keepslotlen = 25;
+keepslotlen = 18;
+keepslotx = backslotedgespace / 2;
+keepslotwidth = 4;
 
-mainframeextraside = 15;
-mainframeextrafront = 25;
+mainframeextraside = 12;
+mainframeextrafront = 15;
+
+rearwallstrengthwidth = 10;
+keepslotclear = 10;
 
 // computed values
 
-mainframeholex = backslotedgespace/2 + slotwidth/sqrt(2) +
-  backslotmid2screwhole / sqrt(2);
+slotslopediag = sqrt(1 + slotslope*slotslope);
+slotwidthx = slotwidth * slotslopediag;
+
+slotxperlen = slotslope / slotslopediag;
+slotyperlen =         1 / slotslopediag;
 
-mainframeholey = -backslotmid2screwhole / sqrt(2);
+mainframeholex = backslotedgespace/2 + slotpluglongerlen * slotxperlen
+  + 0.5 * slotwidth * slotyperlen;
+
+mainframeholey = -slotpluglongerlen * slotyperlen
+  + 0.5 * slotwidth * slotxperlen;
 
 mainframemaxx = mainframeholex + mainframeextraside;
 mainframeminy = mainframeholey - mainframeextrafront;
@@ -42,21 +65,31 @@ module MainFrame(){
 	cube([mainframemaxx+1, -mainframeminy, basethick]);
       translate([-1, -rearwallthick, 0])
 	cube([mainframemaxx+1, rearwallthick, mainframemaxz]);
-      translate([mainframemaxx,0,0])
-	rotate([90,0,-90])
-	linear_extrude(height=mainframeendthick)
-	polygon([[-mainframeminy, 0],
-		 [0, mainframemaxz],
-		 [0, 0]]);
+
+      for (x=[keepslotx - keepslotclear, mainframemaxx - 0.5]) {
+	translate([x,0,0])
+	  rotate([90,0,-90])
+	  linear_extrude(height=mainframeendthick)
+	  polygon([[-mainframeminy, 0],
+		   [0, mainframemaxz],
+		   [0, 0]]);
+      }
 
       translate([backslotedgespace/2, 0, 1])
 	mirror([0,0,1])
 	linear_extrude(height=slotplugheight+1)
 	polygon([[0,0],
-		 [slotwidth * sqrt(2), 0],
-		 [slotplugdepth / sqrt(2) + slotwidth * sqrt(2),
-		  -slotplugdepth],
-		 [slotplugdepth / sqrt(2), -slotplugdepth]]);
+		 [slotwidthx, 0],
+		 [slotwidthx + slotplugshorterlen * slotxperlen,
+		  -slotplugshorterlen * slotyperlen],
+		 [slotpluglongerlen * slotxperlen,
+		  -slotpluglongerlen * slotyperlen]]);
+      translate([-1,
+		 -rearwallthick - boltholeslotshorter + 0.2,
+		 tubedia + tubetubetopslop + tubetubethick + 4])
+	cube([keepslotx - keepslotclear + 1,
+	      boltholeslotshorter + 0.5,
+	      rearwallstrengthwidth]);
     }
   }
 }
@@ -82,9 +115,17 @@ module Jig(){
       translate([0,0,-0.1])
 	TubeThing(10, tubedia, 0, 5);
       translate([-boltholedia/2, mainframeminy - 1, -5])
-	cube([boltholedia, -mainframeminy + 1 - rearwallthick - 0.1,
+	cube([boltholedia,
+	      -mainframeminy + 1 - rearwallthick - boltholeslotshorter,
 	      mainframemaxz + 10]);
       for (m=[0,1]) {
+	mirror([m,0,0]) {
+	  translate([mainframeholex, mainframeholey, -30])
+	    cylinder(h=basethick+40, r=mainframeholedia/2);
+	  translate([keepslotx - keepslotwidth/2,
+		     -10, keepslotstartz])
+	    cube([keepslotwidth, 20, keepslotlen + 10]);
+	}
       }
     }
   }
@@ -93,4 +134,5 @@ module Jig(){
 //MainFrame();
 //TubeThing(0, tubedia);
 
-Jig();
+rotate([-90,0,0])
+  Jig();