nut_height = 1.6; // from calipers
// eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger
-caster_flange_height = 2.9464;
+caster_flange_height = 5;
caster_flange_width = 20.32; // 0.800 inches
caster_flange_screw_radius = 2.286 / 2; // 0.090 inches
caster_flange_screw_length = 8; // eyeballed
translate([-standoff_radius, 0, nut_height/2])
nut(nut_short_side, nut_height);}
+module _2_screw (){
+ //measured with calipers
+ screw_height = 8;
+ thread_radius = 2.17 / 2 - 0.1; // subtract 0.1 to make squeeze fit
+ head_height = 1.8;
+ head_radius = 4.1 / 2;
+ cylinder(r = thread_radius, h = screw_height, $fn = 20);
+ cylinder(r = head_radius, h = head_height, $fn = 20);}
+
module caster_standoff(){
difference(){
union(){
scale([1, 1, 1.1])
caster_flange_screws();
translate([0, 0, standoff_height - (caster_flange_height + nut_height)])
- nuts();}
+ nuts();
+ translate([0, 0, standoff_height]){
+ // make hole to get to screw head depth
+ cylinder(r = 4.1 / 2, h = 3, center = true, $fn = 20);
+ translate([0, 0, -0.7])
+ rotate([180, 0, 0])
+ _2_screw(r = 0.5, h = 5, $fn = 20);}}
deck_flange();
for(ii = [0:3]){
rotate([0, 0, 45 + 90 * ii])
deck_flange_reinforcement();}}
-module caster_top_half(){
- difference(){
- caster_standoff();
- cylinder(r1 = deck_flange_radius * 4 / 3,
- r2 = 0,
- h = standoff_height * 3 / 4);}}
-
-module caster_bottom_half (){
- difference(){
- intersection (){
+module caster_standoff_top(){
+ translate([0, 0, caster_flange_height - standoff_height]){
+ difference(){
caster_standoff();
- cylinder(r1 = deck_flange_radius * 4 / 3,
- r2 = 0,
- h = standoff_height * 3 / 4);}
- // leave a little room for glue
- translate([0, 0, standoff_height * 3 / 4 - 1]) cylinder(r = 2, h = 2);}}
+ translate([-deck_flange_radius, -deck_flange_radius, -0.1])
+ cube([deck_flange_radius * 2,
+ deck_flange_radius * 2,
+ standoff_height - caster_flange_height + 0.1]);}}}
-// move the top half and flip it over for printing
-translate([0, deck_flange_radius + standoff_radius + 1, standoff_height]){
- rotate([0, 180, 0]){
- caster_top_half();}}
-caster_bottom_half();
+caster_standoff_top();