X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=reprap-play.git;a=blobdiff_plain;f=belt-slot-cut-jig.scad;h=07d06530ef74fe947dfc93913f060ea8056954f7;hp=6a5175be1624fb1345e33000ab6b600225d5c677;hb=e85c219aab7693ec7f514a54a953b5656b626c70;hpb=f1aa8021753465a08e9e014499e051c6d78da40e

diff --git a/belt-slot-cut-jig.scad b/belt-slot-cut-jig.scad
index 6a5175b..07d0653 100644
--- a/belt-slot-cut-jig.scad
+++ b/belt-slot-cut-jig.scad
@@ -12,12 +12,12 @@ holder_attach_near_wall = 3;
 
 holder_attach_xsz = 5;
 holder_ctie_width = 4.0 + 0.5;
-holder_ctie_thick = 2.0 + 0.5;
+holder_ctie_thick = 3.0 + 0.5;
 holder_attach_walls = 3;
 holder_attach_roof = 2.5;
 
 jig_interval = 25;
-strap_width = 25;
+strap_width = 26.75 + 0.7;
 strap_thick = 3;
 edgewall_width = 3;
 
@@ -31,6 +31,11 @@ jig_max_len = 160; // print diagonally
 registrationgroove_width = 0.8;
 registrationgroove_depth = 1.2;
 
+registrationprotrusion_poke = 3;
+registrationprotrusion_slope = 0.75;
+
+jig_overlap = 1;
+
 // from careful measurement
 
 crewpunch_shape =
@@ -39,7 +44,11 @@ crewpunch_shape =
    [ 10, [1.6, 6.5], [2.1, 12.8] ],
    [ 12, [1.8, 6.6], [2.3, 12.7] ],
    [ 14, [2.1, 6.8], [2.6, 13.0] ],
-   [ 16, [2.4, 6.9], [2.7, 13.2] ]];
+   [ 16, [2.4, 6.9], [2.7, 13.2] ],
+   [ 18, [2.5, 7.0], [2.9, 13.3] ],
+   [ 22, [3.1, 7.1], [3.2, 13.4] ],
+   [ 26, [3.3, 7.2], [3.5, 13.6] ], 
+   ];
 
 crewpunch_shaft_max_y = 7.5;
 
@@ -50,15 +59,21 @@ crewpunch_min_y = 4.7 - crewpunch_systematic_size_error;
 crewpunch_smallest_shape = crewpunch_shape[0];
 crewpunch_biggest_shape = crewpunch_shape[len(crewpunch_shape)-1];
 
+crewpunch_skew_angle = 2.0; //degrees
+crewpunch_skew_yoff = 0.6; //mm
+
 // computed
 
 attach_ysz = holder_attach_walls*2 + holder_ctie_width;
-holder_front_all = crewpunch_shaft_max_y - crewpunch_biggest_shape[1][1]
-  + attach_ysz;
 
 holder_block_zsz = crewpunch_biggest_shape[0] - crewpunch_smallest_shape[0];
-holder_xsz = crewpunch_biggest_shape[2][0] + crewpunch_biggest_shape[2][1] +
+holder_xsz = crewpunch_biggest_shape[2][1] + crewpunch_biggest_shape[2][0] +
   holder_min_wall*2;
+
+holder_front_all = crewpunch_shaft_max_y - crewpunch_biggest_shape[1][1]
+  + attach_ysz + crewpunch_systematic_size_error + crewpunch_skew_yoff
+  + holder_xsz/2 * sin(abs(crewpunch_skew_angle));
+
 crewpunch_biggest_y =
   crewpunch_biggest_shape[1][0] + crewpunch_biggest_shape[1][1];
 holder_ysz = crewpunch_biggest_y + holder_min_wall + holder_front_all;
@@ -84,7 +99,7 @@ module CrewPunch(){
 	  for(yind=[0,1]) //translate([0,yind?0.5:0,0])
 	    mirror([xind?1:0,0,0]) mirror([0,yind?0:1,0]){
 	      translate([-0.1,-0.1,-0.1])
-		cube([0.1 + layer[2][xind] + ourslop,
+		cube([0.1 + layer[2][1-xind] + ourslop,
 		      0.1 + layer[1][yind] + ourslop,
 		      0.2]);
 	    }
@@ -94,14 +109,19 @@ module CrewPunch(){
 }
 
 module PunchHolder(cutouts=true){
-  translate([-holder_xsz/2,
-	     -holder_ysz + holder_min_wall + crewpunch_biggest_y/2,
-	     0]){
+  translations=[-holder_xsz/2,
+		-holder_ysz + holder_min_wall + crewpunch_biggest_y/2,
+		0];
+  translate(translations){
     difference(){
       translate([0,attach_offset,0])
 	cube([holder_xsz, holder_ysz - attach_offset, holder_block_zsz]);
       if (cutouts)
-	translate([crewpunch_biggest_shape[2][1] + holder_min_wall,
+	translate([0,-crewpunch_skew_yoff])
+	translate(-translations)
+	rotate([0,0,-crewpunch_skew_angle])
+	translate(translations)
+	translate([crewpunch_biggest_shape[2][0] + holder_min_wall,
 		   crewpunch_biggest_shape[1][0] + holder_front_all,
 		   -crewpunch_smallest_shape[0]])
 	  CrewPunch();
@@ -134,7 +154,7 @@ module RegistrationGroove(l){
 
 module OneJig(){
   difference(){
-    translate([-(jig_interval/2 + 1),
+    translate([-(jig_interval/2 + jig_overlap),
 	       -(strap_width/2 + edgewall_width) - attach_offset,
 	       -strap_thick])
       cube([jig_interval + 2,
@@ -155,7 +175,38 @@ module OneJig(){
   }
 }
 
+module RegistrationProtrusion(){
+  // points towards the positive x axis
+  xsz = registrationprotrusion_poke;
+  ysz = registrationprotrusion_poke;
+  diag_sz = xsz * sqrt(2);
+  zsz = diag_sz / registrationprotrusion_slope;
+  hull(){
+    translate([0, 0, 0.1]){
+      linear_extrude(height=0.1)
+	polygon([[   0, -ysz ],
+		 [ xsz,    0 ],
+		 [   0,  ysz ]]);
+      translate([-0.1, 0, zsz ])
+	rotate([0,0,45])
+	cube(0.1);
+    }
+  }
+}
+
 module Jig(){
+  for(end=[0,1]){
+    for(yfrac=[-1/2, 0, 1/2]){
+      translate([ end
+		  ? jig_interval * (jig_iters - 0.5)
+		  : -jig_interval/2,
+		 yfrac * strap_width,
+		 0])
+	rotate([0,0, end ? 0 : 180])
+	translate([ jig_overlap, 0, 0 ])
+	RegistrationProtrusion();
+    }
+  }
   for (i=[0:jig_iters-1]) {
     translate([jig_interval * i, 0, 0])
       OneJig();
@@ -163,7 +214,8 @@ module Jig(){
 }
 
 module JigT(){ ////toplevel
-  rotate([180,0,0])
+  translate([0,0,jig_main_zsz])
+    rotate([180,0,0])
     Jig();
 }
 
@@ -176,6 +228,16 @@ module Demo(){
   Jig();
 }
 
+module Kit(){ ////toplevel
+  rotate([0,0,-45]){
+    JigT();
+    translate([(jig_iters-1)*jig_interval/2,
+	       -strap_width,
+	       0])
+      PunchHolder();
+  }
+}
+
 //CrewPunch();
 //PunchHolder();
 //PunchHolder(false);
@@ -183,4 +245,5 @@ module Demo(){
 //Jig();
 //Demo();
 //JigT();
+//RegistrationProtrusion();
 //PunchHolderT();