X-Git-Url: http://challenge-bot.com/repos/?a=blobdiff_plain;f=3d-printables%2Fcaster-standoff.scad;h=b9d9af9b05ad6ae7947121326062da95104ec270;hb=25dc4aac3549c64dce55ea37a62799323528b8f2;hp=fbf81cc0415d75d85539f6d16898f33782db4460;hpb=aa19128c3fb1d542bf87ee0b04245b4fa94b471e;p=challenge-bot

diff --git a/3d-printables/caster-standoff.scad b/3d-printables/caster-standoff.scad
index fbf81cc..b9d9af9 100644
--- a/3d-printables/caster-standoff.scad
+++ b/3d-printables/caster-standoff.scad
@@ -4,18 +4,21 @@
 // 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 + 0.80; // extra bit added for printing imprecision
+ball_diameter = 11 + 1.0; // extra bit added for printing imprecision
 ball_radius = ball_diameter / 2;
 
-standoff_height = 65; // kyle eyeballed
+standoff_height = 60; // kyle eyeballed
 
+gap = 3;
 wall_thickness = 1;
 holder_floor = 3;
-holder_arms_length = 10;
+holder_arms_length = 20;
 holder_height =
   holder_floor + holder_arms_length + (11 / 16) * ball_diameter;
 
@@ -31,21 +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])
-        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,
@@ -60,13 +66,24 @@ module deck_flange_reinforcement(){
                 deck_flange_radius]);}}}}}
 
 module ball_holder(){
-  gap = wall_thickness * 4;
   difference (){
-    cylinder(r = holder_radius, h = holder_height);
+    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 + 0.1, gap, holder_height - holder_floor + 0.1],
+      cube([holder_diameter + wall_thickness * 2 + 0.1,
+            gap,
+            holder_height - holder_floor + 0.1],
            center = true);}}}
 
 module caster_standoff(){