// 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 + 0.75; // extra bit added for printing imprecision
+ball_diameter = 12.7 + 0.80; // extra bit added for printing imprecision
ball_radius = ball_diameter / 2;
+standoff_height = 60; // kyle eyeballed
+
wall_thickness = 1;
-holder_height = (25 / 32) * ball_diameter + wall_thickness;
+holder_floor = 3;
+holder_arms_length = 20;
+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;
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,
module ball_holder(){
gap = wall_thickness * 4;
- floor = wall_thickness;
difference (){
- cylinder(r = holder_radius, h = holder_height + floor);
- translate([0, 0, ball_radius + wall_thickness + floor]){
+ cylinder(r = holder_radius, h = holder_height);
+ translate([0, 0, ball_radius + holder_floor + holder_arms_length]){
sphere(r = ball_radius);}
- translate([0, 0, holder_height / 2 + wall_thickness + floor]){
- 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();