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=d7a1d13f9cdbbc758e2364e50b103e00a86fca7a;hp=a0cd20b8ba9e0c81a255543b68c03afbe6d26a85;hb=4959ec87d9a6b9129891e0ba45cac508219a4027;hpb=8de1c02172bc5caded372dd5d8dd1dc9449ffdc2

diff --git a/belt-slot-cut-jig.scad b/belt-slot-cut-jig.scad
index a0cd20b..d7a1d13 100644
--- a/belt-slot-cut-jig.scad
+++ b/belt-slot-cut-jig.scad
@@ -8,7 +8,7 @@
 crewpunch_slop = 0.3;
 
 holder_min_wall = 2;
-holder_attach_near_wall = 3;
+holder_attach_near_wall = 5;
 
 holder_attach_xsz = 5;
 holder_ctie_width = 4.0 + 0.5;
@@ -50,33 +50,46 @@ crewpunch_shape =
    [ 26, [3.3, 7.2], [3.5, 13.6] ], 
    ];
 
-crewpunch_shaft_max_y = 3.5;
+crewpunch_shaft_max_y = 7.5;
 
 crewpunch_systematic_size_error = +0.36;
 
 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
+crewpunch_skew_angle = 3.5; //degrees
+crewpunch_skew_yoff = +1.1; //mm
 
 // computed
 
+punch_dx = 0.5 * (-crewpunch_biggest_shape[2][0]
+		  +crewpunch_biggest_shape[2][1]);
+punch_dy = 0.5 * (+crewpunch_biggest_shape[1][1]
+		  -crewpunch_biggest_shape[1][0]) + crewpunch_skew_yoff;
+
 attach_ysz = holder_attach_walls*2 + holder_ctie_width;
 
 holder_block_zsz = crewpunch_biggest_shape[0] - crewpunch_smallest_shape[0];
 holder_xsz = crewpunch_biggest_shape[2][0] + crewpunch_biggest_shape[2][1] +
   holder_min_wall*2;
 
-holder_front_all = crewpunch_shaft_max_y - crewpunch_biggest_shape[1][0]
-  + attach_ysz + crewpunch_systematic_size_error + crewpunch_skew_yoff
-  + holder_xsz/2 * sin(abs(crewpunch_skew_angle));
+holder_skewangle_yextra = holder_xsz/2 * sin(abs(crewpunch_skew_angle));
+
+holder_max_y = punch_dy + crewpunch_biggest_shape[1][0] + holder_min_wall
+  + crewpunch_systematic_size_error + holder_skewangle_yextra;
+
+holder_attach_max_y = punch_dy
+  - max(crewpunch_biggest_shape[1][1], crewpunch_shaft_max_y)
+  - crewpunch_systematic_size_error - holder_skewangle_yextra;
 
-crewpunch_biggest_y =
-  crewpunch_biggest_shape[1][0] + crewpunch_biggest_shape[1][1];
-holder_ysz = crewpunch_biggest_y + holder_min_wall + holder_front_all;
+holder_block_min_y = punch_dy
+  - crewpunch_biggest_shape[1][1] - holder_attach_near_wall +
+  - crewpunch_systematic_size_error - holder_skewangle_yextra;
 
-attach_offset = 0.5 * (holder_front_all - holder_attach_near_wall);
+holder_all_min_y = holder_attach_max_y - attach_ysz;
+
+jig_max_y = max(holder_max_y + main_slop, strap_width/2) + edgewall_width;
+jig_min_y = min(holder_all_min_y - main_slop, -strap_width/2) - edgewall_width;
 
 jig_main_zsz = holder_block_zsz + punch_travel;
 
@@ -107,25 +120,20 @@ module CrewPunch(){
 }
 
 module PunchHolder(cutouts=true){
-  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]);
+      translate([-holder_xsz/2, holder_block_min_y, 0])
+	cube([holder_xsz,
+	      holder_max_y - holder_block_min_y,
+	      holder_block_zsz]);
       if (cutouts)
-	translate([0,-crewpunch_skew_yoff])
-	translate(-translations)
 	rotate([0,0,-crewpunch_skew_angle])
-	translate(translations)
-	translate([crewpunch_biggest_shape[2][1] + holder_min_wall,
-		   crewpunch_biggest_shape[1][1] + holder_front_all,
+	translate([punch_dx,
+		   punch_dy,
 		   -crewpunch_smallest_shape[0]])
 	  CrewPunch();
     }
     difference(){
-      translate([holder_xsz/2 - holder_attach_xsz/2, 0, 0])
+      translate([-holder_attach_xsz/2, holder_all_min_y, 0])
 	cube([holder_attach_xsz,
 	      attach_ysz,
 	      holder_block_zsz + punch_travel
@@ -136,7 +144,6 @@ module PunchHolder(cutouts=true){
 		   holder_block_zsz + punch_travel])
 	  cube([60, holder_ctie_width, holder_ctie_thick]);
     }
-  }
 }
 
 module RegistrationGroove(l){
@@ -153,10 +160,10 @@ module RegistrationGroove(l){
 module OneJig(){
   difference(){
     translate([-(jig_interval/2 + jig_overlap),
-	       -(strap_width/2 + edgewall_width) - attach_offset,
+	       jig_min_y,
 	       -strap_thick])
       cube([jig_interval + 2,
-	    strap_width + edgewall_width*2 + attach_offset,
+	    jig_max_y - jig_min_y,
 	    jig_main_zsz + strap_thick]);
     minkowski(){
       cube([main_slop*2, main_slop*2, 50], center=true);