challenge-bot.com Git - challenge-bot/blob - 3d-printables/motor-mount.scad

   1 // challenge-bot
   2 // GNU AGPLv3 (or later at your option)
   3 // project available at these locations:
   4 // https://gitorious.org/ozzloy/challenge-bot
   5 // https://github.com/waynegramlich/challenge-bot
   6
   7 $fn = 60;
   8
   9 // from schematic http://goo.gl/96RKol
  10 collar_radius = 9.2 / 2;
  11 // subtract a bit to make snap fit
  12 nubbin_radius = (4.48 - 0.3) / 2;  // make snap fit
  13 screw_radius = 2.9 / 2 + 0.1; // a little bigger so screws fit through
  14
  15 motor_height = 22.23;
  16
  17 // http://freespace.virgin.net/matt.waite/resource/handy/screwsize.htm
  18 _6_radius = 3.5 / 2;
  19
  20 // measurements we made up:
  21 mount_total_x = 38;
  22 mount_total_y = mount_total_x;
  23 mount_total_z = 3.175; // 3/16 in mm
  24
  25 module motor_holes(){
  26   collar_x_offset = 10.8;
  27   nubbin_x_offset = 22.23;
  28   // actual motor screw holes are 0.2 further than spec says
  29   screw_x_offset = 30.81 + 0.2;
  30   screw_y_offset = 17.44 / 2;
  31
  32   translate([collar_x_offset, 0, 0]){
  33     cylinder(r = collar_radius, h = mount_total_z + 0.1);}
  34   translate([nubbin_x_offset, 0, 0]){
  35     cylinder(r = nubbin_radius, h = mount_total_z + 0.1);}
  36   translate([screw_x_offset, 0, 0]){
  37     translate([0, screw_y_offset, 0]){
  38       cylinder(r = screw_radius, h = mount_total_z + 0.1);}
  39     translate([0, -screw_y_offset, 0]){
  40       cylinder(r = screw_radius, h = mount_total_z + 0.1);}}}
  41
  42 module bracket_holes(){
  43   translate([6.2, 0, 0])
  44     cylinder(r = _6_radius, h = mount_total_z + 0.1);
  45   translate([mount_total_x - 6.2, 0, 0])
  46     cylinder(r = _6_radius, h = mount_total_z + 0.1);}
  47
  48 module motor_mount(){
  49   difference(){
  50     cube([mount_total_x, mount_total_y, mount_total_z]);
  51     translate([0, 6.2, -0.05]){
  52       bracket_holes();}
  53     translate([1, mount_total_y - motor_height / 2 - 3, -0.05]){
  54       motor_holes();}}}
  55
  56 motor_mount();