From 78701ddb56c37f9f319a1cd6af93d08e06c67c2c Mon Sep 17 00:00:00 2001
From: Ian Jackson <ijackson@chiark.greenend.org.uk>
Date: Sat, 25 May 2013 15:40:01 +0100
Subject: [PATCH] tube-crossdrill-jig: sort out slot plug shape

---
 tube-crossdrill-jig.scad | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/tube-crossdrill-jig.scad b/tube-crossdrill-jig.scad
index ddcea4c..5619e93 100644
--- a/tube-crossdrill-jig.scad
+++ b/tube-crossdrill-jig.scad
@@ -22,7 +22,10 @@ backslotedgespace = 71;
 slotwidth = 11.5;
 backslotmid2screwhole = 17;
 slotplugheight = 5.5;
-slotplugdepth = 10;
+slotplugshorterlen = 8;
+slotpluglongerlen = 18;
+
+slotslope = 11.0 / 18.5;
 
 // "keepslot" refers to the screws in the wooden jig block
 keepslotstartz = 20;
@@ -47,6 +50,14 @@ mainframemaxx = mainframeholex + mainframeextraside;
 mainframeminy = mainframeholey - mainframeextrafront;
 mainframemaxz = keepslotstartz + keepslotlen;
 
+slotslopediag = sqrt(1 + slotslope*slotslope);
+slotwidthx = slotwidth * slotslopediag;
+
+slotxperlen = slotslope / slotslopediag;
+slotyperlen =         1 / slotslopediag;
+
+echo(slotslope, slotslopediag, slotwidthx);
+
 module MainFrame(){
   for (m=[0,1]) {
     mirror([m,0,0]) {
@@ -68,10 +79,11 @@ module MainFrame(){
 	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])
-- 
2.30.2