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=543a53f4d804711136c73d6a25ff79466014c0e7;hp=f6e954c65861691c843189b6c0544f7b429cf806;hb=14f86b26435802ec6292652fc167799e1122ec21;hpb=12b7ef805c549c20254105ddca9541a400c31e4a

diff --git a/belt-slot-cut-jig.scad b/belt-slot-cut-jig.scad
index f6e954c..543a53f 100644
--- a/belt-slot-cut-jig.scad
+++ b/belt-slot-cut-jig.scad
@@ -5,34 +5,28 @@
 //   protrustions at ends at strap width and middle
 //   grooves on top face at 1/4,1/2,3/4 length and 1/2 width
 
+strap_thick = 3;
+strap_width = 26.75 + 0.7;
+
+jig_interval = 25;
+
+edgewall_width = 3;
 crewpunch_slop = 0.3;
+main_slop = 0.25;
 
 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;
-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_thick = 3;
-edgewall_width = 3;
+holder_corner_round = 2.0;
 
 punch_travel = 8;
 
-main_slop = 0.5;
-
-jig_max_len = 160; // print diagonally
-//jig_max_len = 30;
-
-registrationgroove_width = 0.8;
-registrationgroove_depth = 1.2;
-
-jig_overlap = 1;
-
 // from careful measurement
 
 crewpunch_shape =
@@ -41,39 +35,58 @@ 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;
 
 crewpunch_systematic_size_error = +0.36;
 
-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 = 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_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_min_wall*2;
-crewpunch_biggest_y =
-  crewpunch_biggest_shape[1][0] + crewpunch_biggest_shape[1][1];
-holder_ysz = crewpunch_biggest_y + holder_min_wall + holder_front_all;
 
-attach_offset = 0.5 * (holder_front_all - holder_attach_near_wall);
+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;
+
+holder_block_min_y = punch_dy
+  - crewpunch_biggest_shape[1][1] - holder_attach_near_wall +
+  - crewpunch_systematic_size_error - holder_skewangle_yextra;
+
+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;
 
-jig_ends_extra = 2;
+// common stuff
 
-//jig_iters = (jig_max_len - jig_ends_extra) / jig_interval;
-jig_iters=2;
-echo(jig_iters);
+include <belt-cut-jig-common.scad>
 
 // objects
 
@@ -87,7 +100,7 @@ module CrewPunch(){
 	    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,
-		      0.1 + layer[1][yind] + ourslop,
+		      0.1 + layer[1][1-yind] + ourslop,
 		      0.2]);
 	    }
       }
@@ -95,94 +108,88 @@ module CrewPunch(){
   }
 }
 
+module MaybeRoundedCube(sizes, roundedness){
+  if (roundedness > 0) {
+    translate([roundedness, roundedness, 0]){
+      minkowski(){
+	cube([sizes[0] - roundedness*2,
+	      sizes[1] - roundedness*2,
+	      sizes[2]]);
+	cylinder(h=0.05, r=roundedness, $fn=20);
+      }
+    }
+  } else {
+    cube(sizes);
+  }
+}
+
 module PunchHolder(cutouts=true){
-  translate([-holder_xsz/2,
-	     -holder_ysz + holder_min_wall + crewpunch_biggest_y/2,
-	     0]){
+  roundedness = cutouts ? holder_corner_round : 0;
     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])
+	MaybeRoundedCube([holder_xsz,
+			  holder_max_y - holder_block_min_y,
+			  holder_block_zsz],
+			 roundedness);
       if (cutouts)
-	translate([crewpunch_biggest_shape[2][1] + holder_min_wall,
-		   crewpunch_biggest_shape[1][0] + holder_front_all,
+	rotate([0,0,-crewpunch_skew_angle])
+	translate([punch_dx,
+		   punch_dy,
 		   -crewpunch_smallest_shape[0]])
 	  CrewPunch();
     }
     difference(){
-      translate([holder_xsz/2 - holder_attach_xsz/2, 0, 0])
-	cube([holder_attach_xsz,
-	      attach_ysz,
-	      holder_block_zsz + punch_travel
-	      + holder_ctie_thick + holder_attach_roof + 1]);
+      translate([-holder_attach_xsz/2, holder_all_min_y, 0])
+	MaybeRoundedCube([holder_attach_xsz,
+			  attach_ysz,
+			  holder_block_zsz + punch_travel
+			  + holder_ctie_thick + holder_attach_roof + 1],
+			 roundedness);
       if (cutouts)
 	translate([-30,
-		   holder_attach_walls,
+		   holder_all_min_y + holder_attach_walls,
 		   holder_block_zsz + punch_travel])
 	  cube([60, holder_ctie_width, holder_ctie_thick]);
     }
-  }
-}
-
-module RegistrationGroove(l){
-  // runs along the +ve X axis for length l but at correct z pos
-  translate([0, 0, jig_main_zsz + 0.1]) {
-    rotate([90,0,90])
-      linear_extrude(height=l)
-      polygon([[-registrationgroove_width/2, 0],
-	       [ +registrationgroove_width/2, 0],
-	       [ 0, -registrationgroove_depth ]]);
-  }
-}
-
-module OneJig(){
-  difference(){
-    translate([-(jig_interval/2 + jig_overlap),
-	       -(strap_width/2 + edgewall_width) - attach_offset,
-	       -strap_thick])
-      cube([jig_interval + 2,
-	    strap_width + edgewall_width*2 + attach_offset,
-	    jig_main_zsz + strap_thick]);
-    minkowski(){
-      cube([main_slop*2, main_slop*2, 50], center=true);
-      PunchHolder(false);
-    }
-    translate([-100, -strap_width/2, -10])
-      cube([200, strap_width, 10]);
-   translate([-100,0,0])
-     RegistrationGroove(200);
-   for (xfrac=[-1/4,0,+1/4])
-     translate([jig_interval * xfrac, -100, 0])
-       rotate([0,0,90])
-       RegistrationGroove(200);
-  }
 }
 
-module Jig(){
-  for (i=[0:jig_iters-1]) {
-    translate([jig_interval * i, 0, 0])
-      OneJig();
+module OneJigCutout(){
+  minkowski(){
+    cube([main_slop*2, main_slop*2, 50], center=true);
+    PunchHolder(false);
   }
 }
 
 module JigT(){ ////toplevel
-  rotate([180,0,0])
-    Jig();
+  JigPrint();
 }
 
 module PunchHolderT(){ ////toplevel
   PunchHolder(true);
 }
 
-module Demo(){
+module Demo(){ ////toplevel
   %PunchHolder();
   Jig();
 }
 
+module Kit(){ ////toplevel
+  JigT();
+  rotate([0,0,-45]){
+    translate([(jig_iters-1)*jig_interval/2,
+	       jig_min_y - holder_max_y - 5,
+	       0])
+      PunchHolder();
+  }
+}
+
 //CrewPunch();
 //PunchHolder();
 //PunchHolder(false);
 //OneJig();
 //Jig();
-//Demo();
+Demo();
 //JigT();
+//RegistrationProtrusion();
 //PunchHolderT();
+//Kit();