make caster standoff height more obvious

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

diff --git a/3d-printables/caster-standoff.scad b/3d-printables/caster-standoff.scad
index 27288faf94debd74c3d8cd68093cf8fd609a17d0..fbf81cc0415d75d85539f6d16898f33782db4460 100644 (file)
--- a/3d-printables/caster-standoff.scad
+++ b/3d-printables/caster-standoff.scad
@@ -8,17 +8,22 @@
 $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 = 65; // kyle eyeballed
+
 wall_thickness = 1;
-holder_height = (25 / 32) * ball_diameter + wall_thickness;
+holder_floor = 3;
+holder_arms_length = 10;
+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;
@@ -58,21 +63,20 @@ 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();