challenge-bot.com Git - challenge-bot/blob - motor-mount-drill-jig.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 // use this drill jig for putting holes in a motor mount for screws
   8 //  and motor shaft.  the four tabs at the bottom are for clamping
   9 //  the jig down.
  10
  11 mm_per_inch = 25.4;
  12
  13 material_width = (1 / 8) * mm_per_inch;
  14
  15 board_length = 1.75 * mm_per_inch;
  16 board_width = 1.5 * mm_per_inch;
  17 board_depth = (3 / 16) * mm_per_inch;
  18 tab_length = 3 * mm_per_inch;
  19 tab_width = (1 / 4) * mm_per_inch;
  20
  21 union(){
  22   rotate(a = 90, v = [1, 0, 0]) {
  23     cube([board_length + material_width,
  24           1.75 * mm_per_inch + material_width,
  25           material_width]);}
  26
  27   translate(v = [0, -material_width, 0]){
  28     rotate(a = -90, v = [0, 1, 0]) {
  29       cube( [1.75 * mm_per_inch + material_width,
  30              1.5 * mm_per_inch + 2 * material_width,
  31              material_width]);}}
  32
  33   translate(v = [(1.75 * mm_per_inch + material_width) / 2 + tab_width,
  34                  -tab_length,
  35                  0]){
  36     rotate(a = 90, v = [0 ,0 ,1 ]){
  37       cube([3 * mm_per_inch, 0.5 * mm_per_inch , material_width]);}}
  38
  39   translate(v = [-tab_length,
  40                  (1.5 * mm_per_inch + material_width) / 2 - tab_width,
  41                  0]){
  42     cube([3 * mm_per_inch, 0.5 * mm_per_inch , material_width]);}
  43
  44   translate(v = [(1.75 * mm_per_inch + material_width) / 2 + tab_width,
  45                  (1.5 * mm_per_inch),
  46                  0]){
  47     rotate(a = 90, v = [0, 0, 1]){
  48       cube([3 * mm_per_inch, 0.5 * mm_per_inch , material_width]);}}
  49
  50   translate(v = [(1.75 * mm_per_inch),
  51                  (1.5 * mm_per_inch + material_width) / 2 - tab_width,
  52                  0]){
  53     cube([3 * mm_per_inch, 0.5 * mm_per_inch , material_width]);}}
  54
  55 _4_40 = 0.1285 * mm_per_inch / 2; // size of hole for 4x40
  56 _6_32 = 0.1495 * mm_per_inch / 2; // size of hole for 6x32
  57
  58 module collar_hole(){
  59   cylinder(h = board_depth, r = 2 * _6_32, $fn = 20);}
  60
  61 module nubbin_hole(){
  62   cylinder(h = board_depth, r = _6_32, $fn = 20);}
  63
  64 module mounting_screw_hole(){
  65   cylinder(h = board_depth, r = _6_32, $fn = 20);}
  66
  67 module bracket_screw_hole(){
  68   cylinder(h = board_depth, r = _6_32, $fn = 20);}
  69
  70 module wheel_motor_holes(scale){
  71   translate([51 - 26.78, 38 - 10.8, 0] * scale) {
  72     collar_hole();}
  73   translate([51 - 26.78, 38 - 22.23, 0] * scale){
  74     nubbin_hole();}
  75   translate([51 - 18.05 - 17.45, 38 - 30.81,  0] * scale){
  76     mounting_screw_hole();}
  77   translate([51 - 18.05, 38 - 30.81, 0] * scale){
  78     mounting_screw_hole();}
  79   translate([7.5, 8.5, 0] * scale){
  80     bracket_screw_hole();}
  81   translate([7.5, 21 + 8.5,   0] * scale){
  82     bracket_screw_hole();}}
  83
  84 module wheel_mount(scale){
  85   difference(){
  86     cube(scale * [board_length + material_width,
  87                   board_width + material_width,
  88                   material_width]);
  89     wheel_motor_holes(scale);}}
  90
  91 wheel_mount(1);
  92
  93 translate(v = [0, 0, board_length]) jig_lid();
  94
  95 module jig_lid() {
  96   union() {
  97     wheel_mount(1);
  98     translate(v = [0, -2.1 * material_width, material_width]){
  99       cube([board_length + material_width,
 100             3.1 * material_width,
 101             material_width]);}
 102     translate(v = [0, -2.1 * material_width, 0]){
 103       cube([board_length + material_width, material_width, material_width]);}
 104     translate(v = [-2.1 * material_width, 0, material_width]){
 105       cube([3.1 * material_width,
 106             board_width + material_width,
 107             material_width]);}
 108     translate(v = [-2.1 * material_width, 0, 0]){
 109       cube([material_width, board_width+material_width, material_width]);}}}