grip the ball better in the caster standoff

[challenge-bot] / 3d-printables / caster-standoff.scad

diff --git a/3d-printables/caster-standoff.scad b/3d-printables/caster-standoff.scad
index 51481570318c6b753baa62c613133335f4aa7ccb..69147814e7c8aa86f0d8e9d8bd42da5392966778 100644 (file)
--- a/3d-printables/caster-standoff.scad
+++ b/3d-printables/caster-standoff.scad
@@ -15,6 +15,7 @@ ball_radius = ball_diameter / 2;
 
 standoff_height = 60; // kyle eyeballed
 
+gap = 2;
 wall_thickness = 1;
 holder_floor = 3;
 holder_arms_length = 20;
@@ -33,21 +34,22 @@ 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(){
-    scale([0.265, 0.265, 1]){
+    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, -.1])
+    translate([0, deck_pitch_diagonal / 2, -.1])
       cylinder(h = deck_flange_height * 1.1,
                r = deck_flange_screw_radius);}}
 
@@ -64,13 +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(){