// https://gitorious.org/ozzloy/challenge-bot
// https://github.com/waynegramlich/challenge-bot
+standoff_radius = 14.732 / 2; // 0.580 / 2 inches from spec sheet
standoff_height = 55; // eyeballed
+
nut_short_side = 4.7; // from calipers
nut_height = 1.6; // from calipers
-standoff_radius = 14.732 / 2; // 0.580 / 2 inches from spec sheet
-screw_radius = 2.286/2; // 0.090 inches
-caster_flange_screw_length = 8; // eyeballed
+
// eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger
caster_flange_height = 2.9464 * 2;
caster_flange_width = 20.32; // 0.800 inches
-ziptie_width = 4.7625; // 3/16 inch
-ziptie_height = 3; // i'm guessing
+caster_flange_screw_radius = 2.286 / 2; // 0.090 inches
+caster_flange_screw_length = 8; // eyeballed
+
+deck_grid_width = 17.4; // guessing
+deck_flange_height = 2.9464 * 2;
+deck_flange_screw_radius = 3.556 / 2; // For #6 machine screws
+deck_flange_radius = deck_grid_width * 1.5;
+
+module deck_flange(){
+ difference(){
+ cylinder(h = deck_flange_height, r = deck_flange_radius);
+ for(ii = [-1, 1]){
+ translate([deck_grid_width * ii, 0, -.1])
+ cylinder(h = deck_flange_height * 1.1,
+ r = deck_flange_screw_radius,
+ $fn = 20);}
+ for(ii = [-1, 1]){
+ translate([0, deck_grid_width * ii, -.1])
+ cylinder(h = deck_flange_height * 1.1,
+ r = deck_flange_screw_radius,
+ $fn = 20);}}}
+
+module deck_flange_reinforcement(){
+ translate([-deck_flange_radius,
+ -.5 * deck_flange_height,
+ deck_flange_height]){
+ difference (){
+ cube([deck_flange_radius, deck_flange_height, deck_flange_radius]);
+ translate([-.1, -.05 * deck_flange_height, 0]){
+ rotate([0, -45, 0]){
+ cube([deck_flange_radius * 1.5, // 1.5 is bigger than sqrt(2)
+ deck_flange_height * 1.1, // 1.1 is bigger than 1
+ deck_flange_radius]);}}}}}
module caster_flange_screws(){
translate([standoff_radius, 0, 0])
- cylinder(h = caster_flange_screw_length, r = screw_radius, $fn = 20);
+ cylinder(h = caster_flange_screw_length,
+ r = caster_flange_screw_radius,
+ $fn = 20);
translate([-standoff_radius, 0, 0])
- cylinder(h = caster_flange_screw_length, r = screw_radius, $fn = 20);}
+ cylinder(h = caster_flange_screw_length,
+ r = caster_flange_screw_radius,
+ $fn = 20);}
module caster_flange(){
side_radius = caster_flange_width / 2 - standoff_radius;
translate([-standoff_radius, 0, nut_height/2])
nut(nut_short_side, nut_height);}
-module ziptie(){
- translate([-standoff_radius, -ziptie_width/2, 0])
- cube([standoff_radius * 2, ziptie_width, ziptie_height]);}
-
module caster_standoff(){
difference(){
union(){
cylinder(h = standoff_height, r = standoff_radius);
- caster_flange();}
- translate([0, 0, -.1]) scale([1, 1, 1.1])
- caster_flange_screws();
- translate([0, 0, caster_flange_height])
- nuts();
- translate([0, 0, standoff_height * 3 / 4]) scale([1.1, 1, 1])
- ziptie();
- rotate([0, 0, 90]) translate([0, 0, standoff_height * 1 / 2])
- scale([1.1, 1, 1])
- ziptie();}}
+ translate([0, 0, standoff_height - caster_flange_height])
+ caster_flange();}
+ translate([0, 0, standoff_height - caster_flange_screw_length * 1.1 + 0.1])
+ scale([1, 1, 1.1])
+ caster_flange_screws();
+ translate([0, 0, standoff_height - (caster_flange_height + nut_height)])
+ nuts();}
+ deck_flange();
+ for(ii = [0:3]){
+ rotate([0, 0, 45 + 90 * ii])
+ deck_flange_reinforcement();}}
caster_standoff();