key-double.scad

   1 //measures are in millimeters
   2 //(feel free to cocnvert them to attoparsecs)
   3 AY=37.0;
   4 AX=19.0;
   5 BY=32.0;
   6 BLX=14.5;
   7 EZ=11.0;
   8 FLZ=14.0;
   9 H=12.75;
  10 SHAFT_OFF_Y=28.0;
  11 BLIND_SHAFT_OFF_Y=9.0;
  12 CYL_OFF_Z=200;
  13 CYL_DEPTH=0.1;
  14 CLIP_X=2;
  15 CLIP_Y=0.75;
  16 CLIP_H=3*CLIP_Y;
  17 CORNER_RADIUS=2;
  18 INNER_GUARD_RADIUS=6.5;
  19 OUTER_GUARD_RADIUS=7.5;
  20 BLIND_SHAFT_OUTER_DIAMETER=4.0;
  21 BLIND_SHAFT_INNER_DIAMETER=2.0;
  22 SHAFT_X=8.0;
  23 SHAFT_Y=6.0;
  24 SHAFT_LENGTH=9.0;
  25 SHAFT_THICKNESS=1.0;
  26 SHAFT_CLIP_WIDTH=3.0;
  27 SHAFT_CLIP_THICKNESS=0.75;
  28 SHAFT_CLIP_HEIGHT=2.0;
  29 SHAFT_CLIP_SLOPE_DEPTH=1.0;
  30 SHAFT_CLIP_ANGLE=45;
  31 SHAFT_END_CUTOUT_HEIGHT=1.5;
  32 SHAFT_LARGE_SLOT_TO_BASE=1.5;
  33 SHAFT_SMALL_SLOT_LENGTH=7.25;
  34 SHAFT_SMALL_SLOT_WIDTH=2.5;
  35 SHAFT_SPRING_HOLDER_WIDTH=3.0;
  36 SHAFT_SPRING_HOLDER_TO_BASE=4.0;
  37 SHAFT_SPRING_GUIDE_WIDTH=1.0;
  38 SHAFT_SPRING_GUIDE_SIDES_HEIGHT=3.5;
  39 STRUT_THICKNESS=1;
  40 STRUT_HEIGHT=3;
  41 STRUT_SPACING=1;
  42 SHAFT_SPRING_HOLDER_NIPPLE_HEIGHT=1;
  43 SHAFT_SPRING_HOLDER_NIPPLE_RADIUS=0.75;
  44
  45 SHAFT_SMALL_SLOT_BEVEL=0.5;
  46
  47 WallThickness=0.75;
  48 ClipWidth=2.2;
  49 ClipDepth=0.75;
  50
  51 //ascfront=FLZ/sqrt(pow(FLZ,2)-pow(H,2));
  52 //asctop=(H-EZ)/sqrt(pow(BLX,2)-pow((H-EZ),2));
  53
  54 alpha=asin((H-EZ)/BLX);
  55 beta=asin(H/FLZ);
  56 gamma=90-asin((0.5*(AY-BY))/EZ);
  57
  58 module keycap(){
  59         scale([AX/(AX+2*CORNER_RADIUS),AY/(AY+2*CORNER_RADIUS),1])
  60         translate([CORNER_RADIUS,CORNER_RADIUS,0.01])
  61         minkowski(){
  62                 difference(){
  63                         cube([AX,AY,H]);
  64                         rotate(a=gamma,v=[1,0,0]) cube([100,100,100]);
  65                         translate([0,AY,0]) rotate(a=90-gamma,v=[1,0,0]) cube([100,100,100]);
  66                         translate([0,0,EZ]) rotate(a=-alpha,v=[0,1,0]) translate([-50,0,0]) cube([100,100,100]);
  67                         translate([0,AY/2,EZ+CYL_OFF_Z]) rotate(a=90-alpha,v=[0,1,0]) cylinder(h=100,center=true,r=CYL_OFF_Z+CYL_DEPTH,$fa=1);
  68                         translate([AX,0,0]) rotate(a=beta-90,v=[0,1,0]) cube([100,100,100]);
  69                 }
  70                 cylinder(h=0.01,r=CORNER_RADIUS,$fs=0.6);
  71                 //rotate(a=90,v=[1,0,0]) cylinder(h=0.01,r=1,$fs=0.3);
  72         }
  73 }
  74
  75 module blind_shaft(){
  76         translate([0,0,-SHAFT_LENGTH]) difference(){
  77                 cylinder(r=BLIND_SHAFT_OUTER_DIAMETER/2,h=100,$fs=0.3);
  78                 cylinder(r=BLIND_SHAFT_INNER_DIAMETER/2,h=100,$fs=0.3);
  79         }
  80 }
  81
  82 module shaft(){
  83         spring_guide_length = SHAFT_X-SHAFT_THICKNESS-SHAFT_SPRING_HOLDER_WIDTH;
  84         spring_guide_height = SHAFT_SPRING_HOLDER_TO_BASE-SHAFT_LARGE_SLOT_TO_BASE;
  85         translate([0,0,-SHAFT_LENGTH]) difference(){
  86                 union(){
  87                         difference(){
  88                                 union(){
  89                                         difference(){
  90                                                 intersection(){
  91                                                         cylinder(h=100,r=SHAFT_X/2,$fs=0.3);
  92                                                         translate([-SHAFT_X/2,-SHAFT_Y/2,0]) cube([SHAFT_X,SHAFT_Y,100]);
  93                                                 }
  94                                                 intersection(){
  95                                                         cylinder(h=100,r=SHAFT_X/2-SHAFT_THICKNESS,$fs=0.3);
  96                                                         translate([-SHAFT_X/2+SHAFT_THICKNESS,-SHAFT_Y/2+SHAFT_THICKNESS,0]) cube([SHAFT_X-2*SHAFT_THICKNESS,SHAFT_Y-2*SHAFT_THICKNESS,100]);
  97                                                 }
  98                                         }
  99                                         translate([-SHAFT_CLIP_WIDTH/2, -SHAFT_CLIP_THICKNESS-SHAFT_Y/2,0]) cube([SHAFT_CLIP_WIDTH/2, SHAFT_CLIP_THICKNESS,SHAFT_CLIP_HEIGHT]);
 100                                         translate([-SHAFT_CLIP_WIDTH/2, SHAFT_Y/2,0]) cube([SHAFT_CLIP_WIDTH/2, SHAFT_CLIP_THICKNESS,SHAFT_CLIP_HEIGHT]);
 101                                 }
 102                                 translate([-SHAFT_CLIP_WIDTH/2, -SHAFT_CLIP_THICKNESS-SHAFT_Y/2+SHAFT_CLIP_SLOPE_DEPTH,0]) rotate(a=90+SHAFT_CLIP_ANGLE,v=[1,0,0]) cube([SHAFT_CLIP_WIDTH/2,100,100]);
 103                                 translate([-SHAFT_CLIP_WIDTH/2, SHAFT_Y/2+SHAFT_CLIP_THICKNESS-SHAFT_CLIP_SLOPE_DEPTH,0]) mirror([0,1,0]) rotate(a=90+SHAFT_CLIP_ANGLE,v=[1,0,0]) cube([SHAFT_CLIP_WIDTH/2,100,100]);
 104                                 translate([0,-50,0]) cube([100,100,SHAFT_END_CUTOUT_HEIGHT]);
 105                                 translate([0,-SHAFT_Y/2+SHAFT_THICKNESS,0]) cube([100,SHAFT_Y-SHAFT_THICKNESS*2,SHAFT_LENGTH+SHAFT_LARGE_SLOT_TO_BASE]);
 106                                 //small slot cutout
 107                                 translate([0,-SHAFT_SMALL_SLOT_WIDTH/2,0]){
 108                                         mirror([1,0,0]) cube([100,SHAFT_SMALL_SLOT_WIDTH,SHAFT_SMALL_SLOT_LENGTH-0.5*SHAFT_SMALL_SLOT_WIDTH]);
 109                                 }
 110                                 //small slot cutout
 111                                 translate([0,0,SHAFT_SMALL_SLOT_LENGTH-0.5*SHAFT_SMALL_SLOT_WIDTH]) rotate(a=-90,v=[0,1,0]) cylinder(r=SHAFT_SMALL_SLOT_WIDTH/2,h=SHAFT_X/2,$fs=0.3);
 112                         }
 113                         //spring holder
 114                         translate([-SHAFT_X/2+SHAFT_SPRING_HOLDER_WIDTH/2+SHAFT_THICKNESS,0,SHAFT_LENGTH+SHAFT_SPRING_HOLDER_TO_BASE]) cylinder(r=SHAFT_SPRING_HOLDER_WIDTH/2,h=100,$fs=0.3);
 115                         intersection(){
 116                                 translate([-SHAFT_X/2+SHAFT_SPRING_HOLDER_WIDTH/2+SHAFT_THICKNESS,0,SHAFT_LENGTH+SHAFT_SPRING_HOLDER_TO_BASE-SHAFT_SPRING_HOLDER_NIPPLE_HEIGHT]) cylinder(r=SHAFT_SPRING_HOLDER_NIPPLE_RADIUS,h=100,$fs=0.3);
 117                                 translate([0,0,SHAFT_LENGTH+SHAFT_SPRING_HOLDER_TO_BASE-SHAFT_SPRING_HOLDER_NIPPLE_HEIGHT*1.5]) rotate(v=[0,1,0], a=atan(SHAFT_SPRING_HOLDER_NIPPLE_HEIGHT/(SHAFT_SPRING_HOLDER_NIPPLE_RADIUS*2))) translate([-50,-50,0]) cube(100,100,100);
 118                         }
 119                         intersection(){
 120                                 difference(){
 121                                         translate([SHAFT_X/2-SHAFT_THICKNESS,-0.5*SHAFT_SPRING_GUIDE_WIDTH,SHAFT_LENGTH+SHAFT_LARGE_SLOT_TO_BASE]) mirror([1,0,0]) cube([100,SHAFT_SPRING_GUIDE_WIDTH,100]);
 122                                         translate([-SHAFT_X/2+SHAFT_SPRING_HOLDER_WIDTH+SHAFT_THICKNESS,-0.5*SHAFT_SPRING_GUIDE_WIDTH,SHAFT_LENGTH+SHAFT_SPRING_HOLDER_TO_BASE])
 123                                         mirror([1,0,0]) rotate(a=90-asin(spring_guide_height/spring_guide_length),v=[0,1,0]) mirror([0,0,1]) translate([0,0,-50]) cube([100,SHAFT_SPRING_GUIDE_WIDTH,100]);
 124                                 }
 125                                 cube([SHAFT_X-SHAFT_THICKNESS,SHAFT_Y,100],center=true);
 126                         }
 127                         //side spring guides
 128                         difference(){
 129                                 translate([-SHAFT_X/2+SHAFT_THICKNESS+(SHAFT_SPRING_HOLDER_WIDTH-SHAFT_SPRING_GUIDE_WIDTH)/2,-SHAFT_Y/2+SHAFT_THICKNESS,SHAFT_LENGTH+SHAFT_SPRING_HOLDER_TO_BASE-SHAFT_SPRING_GUIDE_SIDES_HEIGHT]) cube([SHAFT_SPRING_GUIDE_WIDTH,SHAFT_Y-2*SHAFT_THICKNESS,EZ-SHAFT_SPRING_HOLDER_TO_BASE+SHAFT_SPRING_GUIDE_SIDES_HEIGHT]);
 130                                 translate([-SHAFT_X/2+SHAFT_THICKNESS+(SHAFT_SPRING_HOLDER_WIDTH-SHAFT_SPRING_GUIDE_WIDTH)/2,-SHAFT_SPRING_HOLDER_WIDTH/2,SHAFT_LENGTH+SHAFT_SPRING_HOLDER_TO_BASE]) rotate(a=-asin(((SHAFT_Y-SHAFT_SPRING_HOLDER_WIDTH)/2-SHAFT_THICKNESS)/SHAFT_SPRING_GUIDE_SIDES_HEIGHT),v=[1,0,0]) translate([0,0,-50]) cube([SHAFT_SPRING_GUIDE_WIDTH,100,100]);
 131                         }
 132                         difference(){
 133                                 translate([-SHAFT_X/2+SHAFT_THICKNESS+(SHAFT_SPRING_HOLDER_WIDTH-SHAFT_SPRING_GUIDE_WIDTH)/2,-SHAFT_Y/2+SHAFT_THICKNESS,SHAFT_LENGTH+SHAFT_SPRING_HOLDER_TO_BASE-SHAFT_SPRING_GUIDE_SIDES_HEIGHT]) cube([SHAFT_SPRING_GUIDE_WIDTH,SHAFT_Y-2*SHAFT_THICKNESS,EZ-SHAFT_SPRING_HOLDER_TO_BASE+SHAFT_SPRING_GUIDE_SIDES_HEIGHT]);
 134                                 mirror([0,1,0]) translate([-SHAFT_X/2+SHAFT_THICKNESS+(SHAFT_SPRING_HOLDER_WIDTH-SHAFT_SPRING_GUIDE_WIDTH)/2,-SHAFT_SPRING_HOLDER_WIDTH/2,SHAFT_LENGTH+SHAFT_SPRING_HOLDER_TO_BASE]) rotate(a=-asin(((SHAFT_Y-SHAFT_SPRING_HOLDER_WIDTH)/2-SHAFT_THICKNESS)/SHAFT_SPRING_GUIDE_SIDES_HEIGHT),v=[1,0,0]) translate([0,0,-50]) cube([SHAFT_SPRING_GUIDE_WIDTH,100,100]);
 135                         }
 136                 }
 137                 translate([-SHAFT_X/2+SHAFT_SPRING_HOLDER_WIDTH+SHAFT_THICKNESS,-SHAFT_Y/2+SHAFT_THICKNESS,SHAFT_LENGTH+SHAFT_SPRING_HOLDER_TO_BASE]) mirror([1,0,0]) rotate(a=90-asin(spring_guide_height/spring_guide_length),v=[0,1,0]) mirror([0,0,1]) cube([SHAFT_THICKNESS,SHAFT_Y-2*SHAFT_THICKNESS,100]);
 138         }
 139 }
 140
 141 module guard(){
 142         difference(){
 143                 union(){
 144                         cube([100,STRUT_THICKNESS,100],center=true);
 145                         cylinder(r=OUTER_GUARD_RADIUS,h=100);
 146                 }
 147                 difference(){
 148                         cylinder(r=INNER_GUARD_RADIUS,h=100);
 149                         translate([-STRUT_SPACING/2-STRUT_THICKNESS,-50,EZ-STRUT_HEIGHT]) cube([STRUT_THICKNESS,100,STRUT_HEIGHT]);
 150                         translate([STRUT_SPACING/2,-50,EZ-STRUT_HEIGHT]) cube([STRUT_THICKNESS,100,STRUT_HEIGHT]);
 151                         translate([-50,-STRUT_SPACING/2-STRUT_THICKNESS,EZ-STRUT_HEIGHT]) cube([100,STRUT_THICKNESS,STRUT_HEIGHT]);
 152                         translate([-50,STRUT_SPACING/2,EZ-STRUT_HEIGHT]) cube([100,STRUT_THICKNESS,STRUT_HEIGHT]);
 153                 }
 154         }
 155 }
 156
 157 difference(){
 158         keycap();
 159         difference(){
 160                 translate([WallThickness, WallThickness, 0]) scale(v=[1-2*WallThickness/AX, 1-2*WallThickness/AY, 1-WallThickness/H]) keycap();
 161                 translate([OUTER_GUARD_RADIUS+WallThickness,0,0]){
 162                         translate([0,SHAFT_OFF_Y]) guard();
 163                         translate([0,BLIND_SHAFT_OFF_Y]) guard();
 164                         difference(){
 165                                  cube([STRUT_THICKNESS,100,100],center=true);
 166                                  translate([0,SHAFT_OFF_Y]) cube([100,2*OUTER_GUARD_RADIUS-WallThickness,100],center=true);
 167                                  translate([0,BLIND_SHAFT_OFF_Y]) cube([100,2*OUTER_GUARD_RADIUS-WallThickness,100],center=true);
 168                         }
 169                 }
 170         }
 171 }
 172 intersection(){
 173         union(){
 174                 translate([WallThickness, WallThickness, 0]) scale(v=[1-2*WallThickness/AX, 1-2*WallThickness/AY, 1-WallThickness/H]) keycap();
 175                 translate([-50,-50,-99.9]) cube([100,100,100]);
 176         }
 177         translate([OUTER_GUARD_RADIUS+WallThickness,0,0]){
 178                 translate([0,SHAFT_OFF_Y]) shaft();
 179                 translate([0,BLIND_SHAFT_OFF_Y]) blind_shaft();
 180         }
 181 }