chiark / gitweb /
belt-slot-cut-jig: transpose punch shape (as that seems to be what we should do)
[reprap-play.git] / belt-slot-cut-jig.scad
index aa0f632..408ed23 100644 (file)
@@ -1,15 +1,41 @@
 // -*- C -*-
 
+// todo
+//  various registration marks
+//   protrustions at ends at strap width and middle
+//   grooves on top face at 1/4,1/2,3/4 length and 1/2 width
+
 crewpunch_slop = 0.3;
 
 holder_min_wall = 2;
+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 = 26.75 + 0.7;
+strap_thick = 3;
+edgewall_width = 3;
+
+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;
+
+registrationprotrusion_poke = 3;
+registrationprotrusion_slope = 0.75;
+
+jig_overlap = 1;
+
 // from careful measurement
 
 crewpunch_shape =
@@ -18,7 +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;
 
@@ -32,14 +62,25 @@ crewpunch_biggest_shape = crewpunch_shape[len(crewpunch_shape)-1];
 // computed
 
 attach_ysz = holder_attach_walls*2 + holder_ctie_width;
-holder_front_wall = crewpunch_shaft_max_y - crewpunch_biggest_shape[1][1]
+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_ysz = crewpunch_biggest_shape[1][0] + crewpunch_biggest_shape[1][1] +
-  holder_min_wall + holder_front_wall;
+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);
+
+jig_main_zsz = holder_block_zsz + punch_travel;
+
+jig_ends_extra = 2;
+
+//jig_iters = (jig_max_len - jig_ends_extra) / jig_interval;
+jig_iters=2;
+echo(jig_iters);
 
 // objects
 
@@ -52,7 +93,7 @@ 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]);
            }
@@ -61,25 +102,126 @@ module CrewPunch(){
   }
 }
 
-module PunchHolder(){
-  offset = holder_attach_xsz + holder_min_wall;
-  difference(){
-    translate([0,offset,0])
-      cube([holder_xsz, holder_ysz - offset, holder_block_zsz]);
-    translate([crewpunch_biggest_shape[2][1] + holder_min_wall,
-              crewpunch_biggest_shape[1][0] + holder_front_wall,
-              -crewpunch_smallest_shape[0]])
-      CrewPunch();
+module PunchHolder(cutouts=true){
+  translate([-holder_xsz/2,
+            -holder_ysz + holder_min_wall + crewpunch_biggest_y/2,
+            0]){
+    difference(){
+      translate([0,attach_offset,0])
+       cube([holder_xsz, holder_ysz - attach_offset, holder_block_zsz]);
+      if (cutouts)
+       translate([crewpunch_biggest_shape[2][0] + holder_min_wall,
+                  crewpunch_biggest_shape[1][0] + holder_front_all,
+                  -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]);
+      if (cutouts)
+       translate([-30,
+                  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([holder_xsz/2 - holder_attach_xsz/2, 0, 0])
-      cube([holder_attach_xsz,
-           attach_ysz,
-           holder_block_zsz + holder_ctie_thick + holder_attach_roof + 1]);
-    translate([-30, holder_attach_walls, holder_block_zsz + 0.1])
-      cube([60, holder_ctie_width, holder_ctie_thick]);
+    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 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();
+  }
+}
+
+module JigT(){ ////toplevel
+  rotate([180,0,0])
+    Jig();
+}
+
+module PunchHolderT(){ ////toplevel
+  PunchHolder(true);
+}
+
+module Demo(){
+  %PunchHolder();
+  Jig();
+}
+
 //CrewPunch();
-PunchHolder();
+//PunchHolder();
+//PunchHolder(false);
+//OneJig();
+//Jig();
+//Demo();
+//JigT();
+//RegistrationProtrusion();
+//PunchHolderT();