keycap-std.scad

   1 //measures are in millimeters
   2 AY=18.5;
   3 AX=19.0;
   4 BY=12.5;
   5 BLX=14.5;
   6 EZ=11.0;
   7 FLZ=14.0;
   8 H=12.75;
   9 CYL_OFF_Z=50;
  10 CYL_DEPTH=0.1;
  11 CLIP_X=2;
  12 CLIP_Y=0.75;
  13 CLIP_H=3*CLIP_Y;
  14 CORNER_RADIUS=2;
  15
  16 WallThickness=0.75;
  17 ClipWidth=2.2;
  18 ClipDepth=0.75;
  19
  20 //ascfront=FLZ/sqrt(pow(FLZ,2)-pow(H,2));
  21 //asctop=(H-EZ)/sqrt(pow(BLX,2)-pow((H-EZ),2));
  22
  23 alpha=asin((H-EZ)/BLX);
  24 beta=asin(H/FLZ);
  25 gamma=90-asin((0.5*(AY-BY))/EZ);
  26
  27 module keycap(){
  28         scale([AX/(AX+2*CORNER_RADIUS),AY/(AY+2*CORNER_RADIUS),1])
  29         translate([CORNER_RADIUS,CORNER_RADIUS,0.01])
  30         minkowski(){
  31                 difference(){
  32                         cube([AX,AY,H]);
  33                         rotate(a=gamma,v=[1,0,0]) cube([100,100,100]);
  34                         translate([0,AY,0]) rotate(a=90-gamma,v=[1,0,0]) cube([100,100,100]);
  35                         translate([0,0,EZ]) rotate(a=-alpha,v=[0,1,0]) translate([-50,0,0]) cube([100,100,100]);
  36                         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,$fa=1);
  37                         translate([AX,0,0]) rotate(a=beta-90,v=[0,1,0]) cube([100,100,100]);
  38                 }
  39                 cylinder(h=0.01,r=CORNER_RADIUS,$fs=0.6);
  40                 //rotate(a=90,v=[1,0,0]) cylinder(h=0.01,r=1,$fs=0.3);
  41         }
  42 }
  43
  44 module clip(){
  45         difference(){
  46                 cube([CLIP_X,CLIP_Y,CLIP_H]);
  47                 translate([0,CLIP_Y,0]) rotate(a=asin(CLIP_Y/CLIP_H),v=[1,0,0]) cube([100,100,100]);
  48         }
  49 }
  50
  51 translate([(AX-CLIP_X)/2,WallThickness,0]) clip();
  52 translate([0,AY,0]) mirror([0,1,0]) translate([(AX-CLIP_X)/2,WallThickness,0]) clip();
  53
  54 difference(){
  55         keycap();
  56         translate([WallThickness, WallThickness, 0]) scale(v=[1-2*WallThickness/AX, 1-2*WallThickness/AY, 1-WallThickness/H]) keycap();
  57 }