key-std.scad

   1 //measures are in millimeters
   2 //(feel free to cocnvert them to attoparsecs)
   3 WallThickness=0.75;
   4 AY=18.5;
   5 AX=19.0;
   6 BY=12.5;
   7 BLX=14.5;
   8 EZ=11.0;
   9 FLZ=14.0;
  10 H=12.75;
  11 CYL_OFF_Z=50;
  12 CYL_DEPTH=0.1;
  13 CLIP_X=2;
  14 CLIP_Y=0.75;
  15 CLIP_H=3*CLIP_Y;
  16 CORNER_RADIUS=2;
  17 SHAFT_OFF_Y=(AY-2*WallThickness)/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 SHAFT_SMALL_SLOT_BEVEL=0.5;
  45
  46 CLIP_NOTCH_DEPTH=1.0;
  47 CLIP_NOTCH_WIDTH=3.0;
  48 CLIP_NOTCH_HEIGHT=1.5;
  49
  50 ClipWidth=2.2;
  51 ClipDepth=0.75;
  52
  53 //ascfront=FLZ/sqrt(pow(FLZ,2)-pow(H,2));
  54 //asctop=(H-EZ)/sqrt(pow(BLX,2)-pow((H-EZ),2));
  55
  56 alpha=asin((H-EZ)/BLX);
  57 beta=asin(H/FLZ);
  58 gamma=90-asin((0.5*(AY-BY))/EZ);
  59
  60 module keycap(){
  61         scale([AX/(AX+2*CORNER_RADIUS),AY/(AY+2*CORNER_RADIUS),1])
  62         translate([CORNER_RADIUS,CORNER_RADIUS,0.01])
  63         minkowski(){
  64                 difference(){
  65                         cube([AX,AY,H]);
  66                         rotate(a=gamma,v=[1,0,0]) cube([100,100,100]);
  67                         translate([0,AY,0]) rotate(a=90-gamma,v=[1,0,0]) cube([100,100,100]);
  68                         translate([0,0,EZ]) rotate(a=-alpha,v=[0,1,0]) translate([-50,0,0]) cube([100,100,100]);
  69                         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,$fa=1);
  70                         translate([AX,0,0]) rotate(a=beta-90,v=[0,1,0]) cube([100,100,100]);
  71                 }
  72                 cylinder(h=0.01,r=CORNER_RADIUS,$fs=0.6);
  73                 //rotate(a=90,v=[1,0,0]) cylinder(h=0.01,r=1,$fs=0.3);
  74         }
  75 }
  76
  77 module blind_shaft(){
  78         translate([0,0,-SHAFT_LENGTH]) difference(){
  79                 cylinder(r=BLIND_SHAFT_OUTER_DIAMETER/2,h=100,$fs=0.3);
  80                 cylinder(r=BLIND_SHAFT_INNER_DIAMETER/2,h=100,$fs=0.3);
  81         }
  82 }
  83
  84 module shaft(){
  85         spring_guide_length = SHAFT_X-SHAFT_THICKNESS-SHAFT_SPRING_HOLDER_WIDTH;
  86         spring_guide_height = SHAFT_SPRING_HOLDER_TO_BASE-SHAFT_LARGE_SLOT_TO_BASE;
  87         translate([0,0,-SHAFT_LENGTH]) difference(){
  88                 union(){
  89                         difference(){
  90                                 union(){
  91                                         difference(){
  92                                                 intersection(){
  93                                                         cylinder(h=100,r=SHAFT_X/2,$fs=0.3);
  94                                                         translate([-SHAFT_X/2,-SHAFT_Y/2,0]) cube([SHAFT_X,SHAFT_Y,100]);
  95                                                 }
  96                                                 intersection(){
  97                                                         cylinder(h=100,r=SHAFT_X/2-SHAFT_THICKNESS,$fs=0.3);
  98                                                         translate([-SHAFT_X/2+SHAFT_THICKNESS,-SHAFT_Y/2+SHAFT_THICKNESS,0]) cube([SHAFT_X-2*SHAFT_THICKNESS,SHAFT_Y-2*SHAFT_THICKNESS,100]);
  99                                                 }
 100                                         }
 101                                         translate([-SHAFT_CLIP_WIDTH/2, -SHAFT_CLIP_THICKNESS-SHAFT_Y/2,0]) cube([SHAFT_CLIP_WIDTH/2, SHAFT_CLIP_THICKNESS,SHAFT_CLIP_HEIGHT]);
 102                                         translate([-SHAFT_CLIP_WIDTH/2, SHAFT_Y/2,0]) cube([SHAFT_CLIP_WIDTH/2, SHAFT_CLIP_THICKNESS,SHAFT_CLIP_HEIGHT]);
 103                                 }
 104                                 translate([-SHAFT_CLIP_WIDTH/2, -SHAFT_CLIP_THICKNESS-SHAFT_Y/2+SHAFT_CLIP_SLOPE_DEPTH,0]) rotate(a=90+SHAFT_CLIP_ANGLE,v=[1,0,0]) cube([SHAFT_CLIP_WIDTH/2,100,100]);
 105                                 translate([-SHAFT_CLIP_WIDTH/2, SHAFT_Y/2+SHAFT_CLIP_THICKNESS-SHAFT_CLIP_SLOPE_DEPTH,0]) mirror([0,1,0]) rotate(a=90+SHAFT_CLIP_ANGLE,v=[1,0,0]) cube([SHAFT_CLIP_WIDTH/2,100,100]);
 106                                 translate([0,-50,0]) cube([100,100,SHAFT_END_CUTOUT_HEIGHT]);
 107                                 translate([0,-SHAFT_Y/2+SHAFT_THICKNESS,0]) cube([100,SHAFT_Y-SHAFT_THICKNESS*2,SHAFT_LENGTH+SHAFT_LARGE_SLOT_TO_BASE]);
 108                                 //small slot cutout
 109                                 translate([0,-SHAFT_SMALL_SLOT_WIDTH/2,0]){
 110                                         mirror([1,0,0]) cube([100,SHAFT_SMALL_SLOT_WIDTH,SHAFT_SMALL_SLOT_LENGTH-0.5*SHAFT_SMALL_SLOT_WIDTH]);
 111                                 }
 112                                 //small slot cutout
 113                                 translate([0,0,SHAFT_SMALL_SLOT_LENGTH-0.5*SHAFT_SMALL_SLOT_WIDTH]) rotate(a=-90,v=[0,1,0]) cylinder(r=SHAFT_SMALL_SLOT_WIDTH/2,h=SHAFT_X/2,$fs=0.3);
 114                         }
 115                         //spring holder
 116                         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,$fs=0.3);
 117                         intersection(){
 118                                 translate([-SHAFT_X/2+SHAFT_SPRING_HOLDER_WIDTH/2+SHAFT_THICKNESS,0,SHAFT_LENGTH+SHAFT_SPRING_HOLDER_TO_BASE-SHAFT_SPRING_HOLDER_NIPPLE_HEIGHT]) cylinder(r=SHAFT_SPRING_HOLDER_NIPPLE_RADIUS,h=100,$fs=0.3);
 119                                 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);
 120                         }
 121                         intersection(){
 122                                 difference(){
 123                                         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]);
 124                                         translate([-SHAFT_X/2+SHAFT_SPRING_HOLDER_WIDTH+SHAFT_THICKNESS,-0.5*SHAFT_SPRING_GUIDE_WIDTH,SHAFT_LENGTH+SHAFT_SPRING_HOLDER_TO_BASE])
 125                                         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]);
 126                                 }
 127                                 cube([SHAFT_X-SHAFT_THICKNESS,SHAFT_Y,100],center=true);
 128                         }
 129                         //side spring guides
 130                         difference(){
 131                                 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]);
 132                                 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]);
 133                         }
 134                         difference(){
 135                                 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]);
 136                                 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]);
 137                         }
 138                 }
 139                 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]);
 140         }
 141 }
 142
 143 module guard(){
 144         difference(){
 145                 union(){
 146                         cube([100,STRUT_THICKNESS,100],center=true);
 147                         cylinder(r=OUTER_GUARD_RADIUS,h=100);
 148                 }
 149                 difference(){
 150                         cylinder(r=INNER_GUARD_RADIUS,h=100);
 151                         translate([-STRUT_SPACING/2-STRUT_THICKNESS,-50,EZ-STRUT_HEIGHT]) cube([STRUT_THICKNESS,100,STRUT_HEIGHT]);
 152                         translate([STRUT_SPACING/2,-50,EZ-STRUT_HEIGHT]) cube([STRUT_THICKNESS,100,STRUT_HEIGHT]);
 153                         translate([-50,-STRUT_SPACING/2-STRUT_THICKNESS,EZ-STRUT_HEIGHT]) cube([100,STRUT_THICKNESS,STRUT_HEIGHT]);
 154                         translate([-50,STRUT_SPACING/2,EZ-STRUT_HEIGHT]) cube([100,STRUT_THICKNESS,STRUT_HEIGHT]);
 155                 }
 156         }
 157 }
 158
 159 difference(){
 160         scale(v=[1-2*WallThickness/AX, 1-2*WallThickness/AY, 1-WallThickness/H]) keycap();
 161         difference(){
 162                 translate([WallThickness, WallThickness, 0]) scale(v=[1-4*WallThickness/AX, 1-4*WallThickness/AY, 1-2*WallThickness/H]) keycap();
 163                 translate([OUTER_GUARD_RADIUS,0,0]){
 164                         translate([0,SHAFT_OFF_Y]) guard();
 165                         difference(){
 166                                  cube([CLIP_NOTCH_WIDTH+2*WallThickness,100,100],center=true);
 167                                  translate([0,SHAFT_OFF_Y]) cube([100,2*OUTER_GUARD_RADIUS-WallThickness,100],center=true);
 168                         }
 169                 }
 170         }
 171
 172         translate([OUTER_GUARD_RADIUS-CLIP_NOTCH_WIDTH/2,0,0]){
 173                 cube([CLIP_NOTCH_WIDTH,CLIP_NOTCH_DEPTH,CLIP_NOTCH_HEIGHT]);
 174                 translate([0,AY-2*WallThickness-CLIP_NOTCH_DEPTH,0]) cube([CLIP_NOTCH_WIDTH,CLIP_NOTCH_DEPTH,CLIP_NOTCH_HEIGHT]);
 175         }
 176 }
 177
 178 intersection(){
 179         union(){
 180                 translate([WallThickness, WallThickness, 0]) scale(v=[1-4*WallThickness/AX, 1-4*WallThickness/AY, 1-2*WallThickness/H]) keycap();
 181                 translate([-50,-50,-99.9]) cube([100,100,100]);
 182         }
 183         translate([OUTER_GUARD_RADIUS,0,0]){
 184                 translate([0,SHAFT_OFF_Y]) shaft();
 185         }
 186 }