X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=caster-standoff.scad;h=47fb8102db382ac02ba53039d80532fc1b8918fd;hb=2a66d46fbef77a36cd8df05658fd303fbbfe52c0;hp=f61ac3aa90d27f62a4dd8e84e3ca3543971c87ed;hpb=17e3b87c0a96e5ad1aff6cead7213038820f7558;p=challenge-bot

diff --git a/caster-standoff.scad b/caster-standoff.scad
index f61ac3a..47fb810 100644
--- a/caster-standoff.scad
+++ b/caster-standoff.scad
@@ -4,31 +4,120 @@
 // https://gitorious.org/ozzloy/challenge-bot
 // https://github.com/waynegramlich/challenge-bot
 
-$fn = 100;
-
-module ball_screws(){
-  between = 14.732;  // 0.580 inches
-  screw_radius = 2.286/2;  // 0.090 inches
-  screw_length = 15;  // i made this up
-  translate([between/2, 0, 0]) cylinder(h = screw_length, r = screw_radius);
-  translate([-between/2, 0, 0]) cylinder(h = screw_length, r = screw_radius);}
-
-module fixture(){
-  height = 2.9464;
-  width = 20.32;
-  between = 14.732;
-  side_radius = (width - between)/2;
-  translate([between/2, 0, 0]) cylinder(h = height, r = side_radius);
-  translate([-between/2, 0, 0]) cylinder(h = height, r = side_radius);
-  }
-
-module caster_standoff(){
-  height = 43;
-  caster_radius = 14.732/2;
+standoff_radius = 14.732 / 2; // 0.580 / 2 inches from spec sheet
+standoff_height = 55; // eyeballed
+
+nut_short_side = 4.7; // from calipers
+nut_height = 1.6; // from calipers
+
+// eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger
+caster_flange_height = 5;
+caster_flange_width = 20.32;  // 0.800 inches
+caster_flange_screw_radius = 2.286 / 2;  // 0.090 inches
+caster_flange_screw_length = 8; // eyeballed
+
+deck_grid_width = 25.4; // measured center to center on grid on pegboard
+deck_flange_height = 2.9464;
+deck_flange_screw_radius = 3.556 / 2;  // For #6 machine screws
+deck_flange_radius = deck_grid_width * 1.22;
+
+module deck_flange(){
+  difference(){
+    cylinder(h = deck_flange_height, r = deck_flange_radius, $fn = 50);
+    for(ii = [-1, 1]){
+      translate([deck_grid_width * ii, 0, -.1])
+        cylinder(h = deck_flange_height * 1.1,
+                 r = deck_flange_screw_radius,
+                 $fn = 20);}
+    for(ii = [-1, 1]){
+      translate([0, deck_grid_width * ii, -.1])
+        cylinder(h = deck_flange_height * 1.1,
+                 r = deck_flange_screw_radius,
+                 $fn = 20);}}}
+
+module deck_flange_reinforcement(){
+  translate([-deck_flange_radius,
+             -.5 * deck_flange_height / 2,
+             deck_flange_height]){
+    difference (){
+      cube([deck_flange_radius, deck_flange_height / 2, deck_flange_radius]);
+      translate([-.1, -.05 * deck_flange_height, 0]){
+        rotate([0, -45, 0]){
+          cube([deck_flange_radius * 1.5, // 1.5 is bigger than sqrt(2)
+                deck_flange_height * 1.1, // 1.1 is bigger than 1
+                deck_flange_radius]);}}}}}
+
+module caster_flange_screws(){
+  translate([standoff_radius, 0, 0])
+    cylinder(h = caster_flange_screw_length,
+             r = caster_flange_screw_radius,
+             $fn = 20);
+  translate([-standoff_radius, 0, 0])
+    cylinder(h = caster_flange_screw_length,
+             r = caster_flange_screw_radius,
+             $fn = 20);}
+
+module caster_flange(){
+  side_radius = caster_flange_width / 2 - standoff_radius;
+  hull(){
+    cylinder(h = caster_flange_height, r = standoff_radius, $fn = 100);
+    translate([standoff_radius, 0, 0])
+      cylinder(h = caster_flange_height, r = side_radius, $fn = 40);
+    translate([-standoff_radius, 0, 0])
+      cylinder(h = caster_flange_height, r = side_radius, $fn = 40);}}
+
+module nut(size, height){
+    width = size/1.75;
+    for (r = [-60, 0, 60]) rotate([0,0,r]) cube([width, size, height], true);}
+
+module nuts(){
+  translate([standoff_radius, 0, nut_height/2])
+    nut(nut_short_side, nut_height + .1);
+  translate([-standoff_radius, 0, nut_height/2])
+    nut(nut_short_side, nut_height + .1);}
+
+module _2_screw (){
+  //measured with calipers
+  screw_length = 8;
+  thread_radius = 2.17 / 2 - 0.1; // subtract 0.1 to make squeeze fit
+  head_height = 1.8;
+  head_radius = 4.1 / 2;
+  cylinder(r = thread_radius, h = screw_length, $fn = 20);
+  cylinder(r = head_radius, h = head_height, $fn = 20);}
+
+module caster_standoff_deck_side(){
+  difference(){
+    cylinder(h = standoff_height - caster_flange_height,
+             r = standoff_radius,
+             $fn = 50);
+    translate([0, 0, standoff_height - caster_flange_screw_length * 1.1 + 0.1])
+      scale([1, 1, 1.1])
+        caster_flange_screws();
+    translate([0, 0, standoff_height - (caster_flange_height + nut_height)])
+      nuts();
+    translate([0, 0, standoff_height]){
+      // make hole to get to screw head depth
+      cylinder(r = 4.1 / 2, h = 3, center = true, $fn = 20);
+      translate([0, 0, -0.7])
+        rotate([180, 0, 0])
+          _2_screw(r = 0.5, h = 5, $fn = 20);}}
+  deck_flange();
+  for(ii = [0:3]){
+    rotate([0, 0, 45 + 90 * ii])
+      deck_flange_reinforcement();}}
+
+module caster_standoff_caster_side(){
   difference(){
-    union(){
-      cylinder(h = height, r = caster_radius);
-      fixture();}
-    scale([1, 1, 1.1]) translate([0, 0, -.1]) ball_screws();}}
+    caster_flange();
+    translate([0, 0, caster_flange_height - 0.7]){
+      rotate([180, 0, 0]){
+        _2_screw();}}
+    // make hole to get to screw head
+    translate([0, 0, caster_flange_height - 0.8]){
+      cylinder(r = 4.1 / 2, h = 10, $fn = 20);}
+    translate([0, 0, -.1]){
+      caster_flange_screws();}}}
 
-caster_standoff();
+caster_standoff_deck_side();
+translate([caster_flange_width / 2 + deck_flange_radius + 1, 0, 0]){
+  caster_standoff_caster_side();}