belt-slot-cut-jig: cope with rotational skew of punch

[reprap-play.git] / tube-crossdrill-jig.scad

diff --git a/tube-crossdrill-jig.scad b/tube-crossdrill-jig.scad
index a7f35b2794d4a454371e3cf5a256c4cc8d836a91..843a2a697123c8e10d87a0f882991cb80da2d8c2 100644 (file)
--- a/tube-crossdrill-jig.scad
+++ b/tube-crossdrill-jig.scad
@@ -1,39 +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 + 0.5;
+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;
@@ -46,27 +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 - 10 + 1,
+       cube([keepslotx - keepslotclear + 1,
              boltholeslotshorter + 0.5,
-             3]);
+             rearwallstrengthwidth]);
     }
   }
 }
@@ -111,4 +134,5 @@ module Jig(){
 //MainFrame();
 //TubeThing(0, tubedia);
 
-Jig();
+rotate([-90,0,0])
+  Jig();