X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=3d-printables%2Fcaster-standoff.scad;h=236de0a2cc6eac755077c3ce361694f5ac855459;hb=0d3ed0b89e201569a83e8806d0c7a3f44a311819;hp=dae0ccfbd147973e5abe9476559a02bc3adb08ef;hpb=5455dacb81e7c22671f85a982b2402ae879c3475;p=challenge-bot

diff --git a/3d-printables/caster-standoff.scad b/3d-printables/caster-standoff.scad
index dae0ccf..236de0a 100644
--- a/3d-printables/caster-standoff.scad
+++ b/3d-printables/caster-standoff.scad
@@ -4,11 +4,29 @@
 // https://gitorious.org/ozzloy/challenge-bot
 // https://github.com/waynegramlich/challenge-bot
 
+use <oshw.scad>
+
 // use 10 ish for development, 60 or so for printing
 $fn = 60;
 
-standoff_radius = 14.732 / 2; // 0.580 / 2 inches from spec sheet
-standoff_height = 48; // eyeballed
+/* measured with calipers */
+ball_diameter = 12.7 + 0.80; // extra bit added for printing imprecision
+ball_radius = ball_diameter / 2;
+
+standoff_height = 60; // kyle eyeballed
+
+gap = 4;
+wall_thickness = 1;
+holder_floor = 3;
+holder_arms_length = 20;
+holder_height =
+  holder_floor + holder_arms_length + (11 / 16) * ball_diameter;
+
+holder_radius = ball_radius + wall_thickness;
+holder_diameter = holder_radius * 2;
+
+standoff_radius = holder_radius; // 0.580 / 2 inches from spec sheet
+standoff_lower_portion_height = standoff_height - holder_height;
 
 // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger
 caster_flange_height = 5;
@@ -16,21 +34,24 @@ 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_pitch = 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) / 2 + deck_flange_screw_radius + 3;
+deck_flange_radius = (deck_pitch) / 2 + deck_flange_screw_radius + 3;
 
 module deck_flange(){
+  deck_pitch_diagonal = sqrt(2 * pow(deck_pitch, 2));
   difference(){
-    cylinder(h = deck_flange_height, r = deck_flange_radius);
+    scale([0.35, 0.35, 1]){
+      linear_extrude(height = deck_flange_height){
+        oshw();}}
     for(ii = [-1, 1]){
-      translate([deck_grid_width / 2 * ii, 0, -.1])
+      translate([deck_pitch_diagonal / 2 * ii, 0, -.1])
         cylinder(h = deck_flange_height * 1.1,
-                 r = deck_flange_screw_radius);
-      translate([0, deck_grid_width / 2 * ii, -.1])
-        cylinder(h = deck_flange_height * 1.1,
-        r = deck_flange_screw_radius);}}}
+                 r = deck_flange_screw_radius);}
+    translate([0, deck_pitch_diagonal / 2, -.1])
+      cylinder(h = deck_flange_height * 1.1,
+               r = deck_flange_screw_radius);}}
 
 module deck_flange_reinforcement(){
   translate([-deck_flange_radius,
@@ -44,35 +65,35 @@ module deck_flange_reinforcement(){
                 deck_flange_height * 1.1, // 1.1 is bigger than 1
                 deck_flange_radius]);}}}}}
 
+module ball_holder(){
+  difference (){
+    union(){
+      cylinder(r = holder_radius, h = holder_height);
+      translate([0, 0, holder_arms_length]){
+        cylinder(r1 = holder_radius,
+                 r2 = holder_radius + wall_thickness,
+                 h = wall_thickness);
+        translate([0, 0, wall_thickness]){
+          cylinder(r = wall_thickness + holder_radius,
+                   h = holder_height
+                       - holder_arms_length
+                       - wall_thickness); }}}
+    translate([0, 0, ball_radius + holder_floor + holder_arms_length]){
+      sphere(r = ball_radius);}
+    translate([0, 0, holder_floor + (holder_height - holder_floor) / 2 + 0.5]){
+      cube([holder_diameter + wall_thickness * 2 + 0.1,
+            gap,
+            holder_height - holder_floor + 0.1],
+           center = true);}}}
+
 module caster_standoff(){
-  cylinder(h = standoff_height - caster_flange_height,
+  cylinder(h = standoff_lower_portion_height,
            r = standoff_radius);
   deck_flange();
   for(ii = [0:3]){
     rotate([0, 0, 45 + 90 * ii])
       deck_flange_reinforcement();}
-  caster_deck_interlock_solid();}
-
-module ball_holder(){
-  /* measured with calipers */
-  ball_diameter = 12.7 + 0.5;
-  ball_radius = ball_diameter / 2;
-
-  wall_thickness = 1.5;
-  holder_height = ball_radius + wall_thickness * 2;
-
-  holder_outer_radius = ball_radius + wall_thickness;
-  holder_outer_diameter = holder_outer_radius * 2;
-
-  difference (){
-    cylinder(r = holder_outer_radius, h = holder_height);
-    translate([0, 0, ball_radius + wall_thickness]){
-      sphere(r = ball_radius);}
-    translate([0, 0, holder_height / 2 + wall_thickness]){
-      cube([holder_outer_diameter + 0.1,
-            wall_thickness * 2,
-            holder_height],
-           center = true);}}}
+  translate([0, 0, standoff_lower_portion_height]){
+    ball_holder();}}
 
-ball_holder();
-//caster_standoff();
+caster_standoff();