X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=3d-printables%2Fcaster-standoff.scad;h=98ca9a4a651faa48ad2b98c832f57add8ab8f9bf;hb=refs%2Fheads%2Fsolid-wheel;hp=27288faf94debd74c3d8cd68093cf8fd609a17d0;hpb=6a7062ce9a8dc6e0944175d161ab2960a1353404;p=challenge-bot

diff --git a/3d-printables/caster-standoff.scad b/3d-printables/caster-standoff.scad
index 27288fa..98ca9a4 100644
--- a/3d-printables/caster-standoff.scad
+++ b/3d-printables/caster-standoff.scad
@@ -4,21 +4,28 @@
 // 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;
 
 /* measured with calipers */
-ball_diameter = 12.7 + 1.25;
+ball_diameter = 12.7 + 0.80; // extra bit added for printing imprecision
 ball_radius = ball_diameter / 2;
 
+standoff_height = 60; // kyle eyeballed
+
 wall_thickness = 1;
-holder_height = (25 / 32) * ball_diameter + wall_thickness;
+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_height = 48; // eyeballed
+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;
@@ -26,21 +33,24 @@ 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])
-        cylinder(h = deck_flange_height * 1.1,
-                 r = deck_flange_screw_radius);
-      translate([0, deck_grid_width / 2 * ii, -.1])
+      translate([deck_pitch_diagonal / 2 * ii, 0, -.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,
@@ -58,21 +68,20 @@ module ball_holder(){
   gap = wall_thickness * 4;
   difference (){
     cylinder(r = holder_radius, h = holder_height);
-    translate([0, 0, ball_radius + wall_thickness]){
+    translate([0, 0, ball_radius + holder_floor + holder_arms_length]){
       sphere(r = ball_radius);}
-    translate([0, 0, holder_height / 2 + wall_thickness]){
-      cube([holder_diameter + 0.1, gap, holder_height],
+    translate([0, 0, holder_floor + (holder_height - holder_floor) / 2 + 0.5]){
+      cube([holder_diameter + 0.1, gap, holder_height - holder_floor + 0.1],
            center = true);}}}
 
 module caster_standoff(){
-  cylinder(h = standoff_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();}
-  translate([0, 0, standoff_height]){
+  translate([0, 0, standoff_lower_portion_height]){
     ball_holder();}}
 
-//caster_standoff();
-ball_holder();
+caster_standoff();