challenge-bot.com Git - challenge-bot/blob - 3d-printables/caster-standoff-data.scad

   1 /*
   2   Copyright (C) 2015 Daniel Watson
   3   See the end of the file for license conditions.
   4 */
   5 // challenge-bot
   6 // GNU AGPLv3 (or later at your option)
   7 // project available here:
   8 // https://challenge-bot.com/
   9
  10 use <oshw.scad>
  11
  12 // use 10 ish for development, 60 or so for printing
  13 $fn = 60;
  14
  15 /* measured with calipers */
  16 ball_diameter = 11 + 1.1; // extra bit added for printing imprecision
  17 ball_radius = ball_diameter / 2;
  18
  19 standoff_height = 60; // kyle eyeballed
  20
  21 gap = 3;
  22 wall_thickness = 1;
  23 holder_floor = 3;
  24 holder_arms_length = 20;
  25 holder_height =
  26   holder_floor + holder_arms_length + (11 / 16) * ball_diameter;
  27
  28 holder_radius = ball_radius + wall_thickness;
  29 holder_diameter = holder_radius * 2;
  30
  31 standoff_radius = holder_radius; // 0.580 / 2 inches from spec sheet
  32 standoff_lower_portion_height = standoff_height - holder_height;
  33
  34 // eyeballed caster flange height, (0.580/5) inches, times 2 to be stronger
  35 caster_flange_height = 5;
  36 caster_flange_width = 20.32;  // 0.800 inches
  37
  38 deck_pitch = 25.4; // measured center to center on grid on pegboard
  39 deck_flange_height = 2.9464;
  40 deck_flange_screw_radius = 3.556 / 2 + 0.4;  // For #6 machine screws
  41 deck_flange_radius = (deck_pitch) / 2 + deck_flange_screw_radius + 3;
  42
  43 module deck_flange() {
  44   deck_pitch_diagonal = sqrt(2 * pow(deck_pitch, 2));
  45   cylinder(h = deck_flange_height, r = holder_radius + 2);
  46   difference() {
  47     scale([0.40, 0.40, 1]) {
  48       linear_extrude(height = deck_flange_height) {
  49         oshw(); } }
  50     for (ii = [-1, 1]) {
  51       translate([deck_pitch_diagonal / 2 * ii, 0, -.1])
  52       cylinder(h = deck_flange_height * 1.1,
  53                r = deck_flange_screw_radius); }
  54     translate([0, deck_pitch_diagonal / 2, -.1])
  55     cylinder(h = deck_flange_height * 1.1,
  56              r = deck_flange_screw_radius); } }
  57
  58 module deck_flange_reinforcement() {
  59   translate([-deck_flange_radius,
  60              -.5 * deck_flange_height / 2,
  61              deck_flange_height]) {
  62     difference() {
  63       cube([deck_flange_radius, deck_flange_height / 2, deck_flange_radius]);
  64       translate([-.1, -.05 * deck_flange_height, 0]) {
  65         rotate([0, -45, 0]) {
  66           cube([deck_flange_radius * 1.5, // 1.5 is bigger than sqrt(2)
  67                 deck_flange_height * 1.1, // 1.1 is bigger than 1
  68                 deck_flange_radius]); } } } } }
  69
  70 module ball_holder() {
  71   difference() {
  72     union() {
  73       cylinder(r = holder_radius, h = holder_height);
  74       translate([0, 0, holder_arms_length]) {
  75         cylinder(r1 = holder_radius,
  76                  r2 = holder_radius + wall_thickness,
  77                  h = wall_thickness);
  78         translate([0, 0, wall_thickness]) {
  79           cylinder(r = wall_thickness + holder_radius,
  80                    h = holder_height
  81                        - holder_arms_length
  82                        - wall_thickness); } } }
  83     translate([0, 0, ball_radius + holder_floor + holder_arms_length]) {
  84       sphere(r = ball_radius); }
  85     translate([0, 0, holder_floor + (holder_height - holder_floor) / 2 + 0.5]) {
  86       cube([holder_diameter + wall_thickness * 2 + 0.1,
  87             gap,
  88             holder_height - holder_floor + 0.1],
  89            center = true); } } }
  90
  91 module caster_standoff() {
  92   cylinder(h = standoff_lower_portion_height,
  93            r = standoff_radius);
  94   deck_flange();
  95   for (ii = [0:3]) {
  96     rotate([0, 0, 45 + 90 * ii])
  97     deck_flange_reinforcement(); }
  98   translate([0, 0, standoff_lower_portion_height]) {
  99     ball_holder(); } }
 100
 101 /*
 102   This file is part of challenge-bot.
 103
 104   Challenge-bot is free software: you can redistribute it and/or modify
 105   it under the terms of the GNU Affero General Public License as published by
 106   the Free Software Foundation, either version 3 of the License, or
 107   (at your option) any later version.
 108
 109   GNU Affero Emacs is distributed in the hope that it will be useful,
 110   but WITHOUT ANY WARRANTY; without even the implied warranty of
 111   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 112   GNU Affero General Public License for more details.
 113
 114   You should have received a copy of the GNU Affero General Public License
 115   along with challenge-bot.  If not, see <http://www.gnu.org/licenses/>.
 116 */