3DPrinting/KeyV2
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1b16b9a916
KeyV2/key.scad
Bob - Home - Windows 1b16b9a916 Better G20 key
2016-09-04 03:22:48 -04:00

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/* [Key] */
//length in units of key
key_length = 1;
//height in units of key. should remain 1 for most uses
key_height = 1;
//keycap type, [0:DCS Row 5, 1:DCS Row 1, 2:DCS Row 2, 3:DCS Row 3, 4:DCS Row 4, 5:DSA Row 3, 6:SA Row 1, 7:SA Row 2, 8:SA Row 3, 9:SA Row 4, 10:DCS Row 4 Spacebar, 11: g20 key (faked)]
key_profile_index = 0;
// keytop thickness, aka how many millimeters between the inside and outside of the top surface of the key
keytop_thickness = 1;
// wall thickness, aka the thickness of the sides of the keycap. note this is the total thickness, aka 3 = 1.5mm walls
wall_thickness = 3;
/* [Brim] */
//enable brim for connector
has_brim = 0;
//brim radius. 11 ensconces normal keycap stem in normal keycap
brim_radius = 11;
//brim depth
brim_depth = .3;
/* [Stabilizers] */
//whether stabilizer connectors are enabled
stabilizers = 0;
//stabilizer distance in mm
stabilizer_distance = 50;
/* [Dish] */
// invert dishing. mostly for spacebar
inverted_dish = 0;
/* [Stem] */
// cherry MX or Alps stem, or totally broken circular cherry stem [0..2]
stem_profile = 0;
// how inset the stem is from the bottom of the key. experimental. requires support
stem_inset = 0;
// stem offset in units NOT MM. for stepped caps lock
stem_offset = 0;
/* [Hidden] */
//change to round things better
$fn = 32;
//beginning to use unit instead of baked in 19.05
unit = 19.05;
//minkowski radius. radius of sphere used in minkowski sum for minkowski_key function. 1.75 default for faux G20
minkowski_radius = 1.75;
//profile specific stuff
/*
Here we have, for lack of a better implementation, an array
that defines the more intimate aspects of a key.
order is thus:
1. Bottom Key Width: width of the immediate bottom of the key
2. Bottom Key Height: height of the immediate bottom of the key
3. Top Key Width Difference: mm to subtract from bottom key width to create top key width
4. Top Key Height Difference: mm to subtract from bottom key height to create top key height
5. total Depth: how tall the total in the switch is before dishing
6. Top Tilt: X rotation of the top. Top and dish obj are rotated
7. Top Skew: Y skew of the top of the key relative to the bottom. DCS has some, DSA has none (its centered)
8. Dish Type: type of dishing. check out dish function for the options
9. Dish Depth: how many mm to cut into the key with
10. Dish Radius: radius of dish obj, the Sphere or Cylinder that cuts into the keycap
*/
key_profiles = [
//DCS Profile
[ //DCS ROW 5
18.16, // Bottom Key Width
18.16, // Bottom Key Height
6, // Top Key Width Difference
4, // Top Key Height Difference
11.5, // total Depth
-6, // Top Tilt
1.75,// Top Skew
//Dish Profile
0, // Dish Type
1, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
[ //DCS ROW 1
18.16, // Bottom Key Width
18.16, // Bottom Key Height
6, // Top Key Width Difference
4, // Top Key Height Difference
8.5, // total Depth
-1, // Top Tilt
1.75,// Top Skew
//Dish Profile
0, // Dish Type
1, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
[ //DCS ROW 2
18.16, // Bottom Key Width
18.16, // Bottom Key Height
6.2, // Top Key Width Difference
4, // Top Key Height Difference
7.5, // total Depth
3, // Top Tilt
1.75,// Top Skew
//Dish Profile
0, // Dish Type
1, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
[ //DCS ROW 3
18.16, // Bottom Key Width
18.16, // Bottom Key Height
6, // Top Key Width Difference
4, // Top Key Height Difference
6.2, // total Depth
7, // Top Tilt
1.75,// Top Skew
//Dish Profile
0, // Dish Type
1, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
[ //DCS ROW 4
18.16, // Bottom Key Width
18.16, // Bottom Key Height
6, // Top Key Width Difference
4, // Top Key Height Difference
6.2, // total Depth
16, // Top Tilt
1.75,// Top Skew
//Dish Profile
0, // Dish Type
1, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
//DSA Profile
[ //DSA ROW 3
18.4, // Bottom Key Width
18.4, // Bottom Key Height
5.7, // Top Key Width Difference
5.7, // Top Key Height Difference
7.4, // total Depth
0, // Top Tilt
0, // Top Skew
//Dish Profile
1, // Dish Type
1.2, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
//SA Proile
[ //SA ROW 1
18.4, // Bottom Key Width
18.4, // Bottom Key Height
5.7, // Top Key Width Difference
5.7, // Top Key Height Difference
13.73, // total Depth, fudged
-14, // Top Tilt
0, // Top Skew
//Dish Profile
1, // Dish Type
1.2, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
[ //SA ROW 2
18.4, // Bottom Key Width
18.4, // Bottom Key Height
5.7, // Top Key Width Difference
5.7, // Top Key Height Difference
11.73, // total Depth
-7, // Top Tilt
0, // Top Skew
//Dish Profile
1, // Dish Type
1.2, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
[ //SA ROW 3
18.4, // Bottom Key Width
18.4, // Bottom Key Height
5.7, // Top Key Width Difference
5.7, // Top Key Height Difference
11.73, // total Depth
0, // Top Tilt
0, // Top Skew
//Dish Profile
1, // Dish Type
1.2, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
[ //SA ROW 4
18.4, // Bottom Key Width
18.4, // Bottom Key Height
5.7, // Top Key Width Difference
5.7, // Top Key Height Difference
11.73, // total Depth
7, // Top Tilt
0, // Top Skew
//Dish Profile
1, // Dish Type
1.2, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
[ //DCS ROW 4 SPACEBAR
18.16, // Bottom Key Width
18.16, // Bottom Key Height
6, // Top Key Width Difference
4, // Top Key Height Difference
6.2, // total Depth
16, // Top Tilt
1.75,// Top Skew
//Dish Profile
2, // Dish Type
1, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
[ //G20 AKA DCS Row 2 with no dish and shorter
18.16, // Bottom Key Width
18.16, // Bottom Key Height
2, // Top Key Width Difference
2, // Top Key Height Difference
6, // total Depth
2.5, // Top Tilt
1,// Top Skew
//Dish Profile
3, // Dish Type
0, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
[ //NONWORKING fake ISO enter
18.16 * 1.5, // Bottom Key Width
18.16 * 2, // Bottom Key Height
4, // Top Key Width Difference
4, // Top Key Height Difference
7, // total Depth
0, // Top Tilt
1.75,// Top Skew
//Dish Profile
0, // Dish Type
1, // Dish Depth
0, // Dish Skew X
0 // DIsh Skew Y
],
];
// derived variables
//key profile selected
key_profile = key_profiles[key_profile_index];
// names, so I don't go crazy
bottom_key_width = key_profile[0];
bottom_key_height = key_profile[1];
width_difference = key_profile[2];
height_difference = key_profile[3];
total_depth = key_profile[4];
top_tilt = key_profile[5] / key_height;
top_skew = key_profile[6];
dish_type = key_profile[7];
dish_depth = key_profile[8];
dish_skew_x = key_profile[9];
dish_skew_y = key_profile[10];
// actual mm key width and height
total_key_width = bottom_key_width + (unit * (key_length - 1));
total_key_height = bottom_key_height + (unit * (key_height - 1));
// actual mm key width and height at the top
top_total_key_width = bottom_key_width + (unit * (key_length - 1)) - width_difference;
top_total_key_height = bottom_key_height + (unit * (key_height - 1)) - height_difference;
//centered
module roundedRect(size, radius) {
x = size[0];
y = size[1];
z = size[2];
translate([-x/2,-y/2,0])
linear_extrude(height=z)
hull() {
translate([radius, radius, 0])
circle(r=radius);
translate([x - radius, radius, 0])
circle(r=radius);
translate([x - radius, y - radius, 0])
circle(r=radius);
translate([radius, y - radius, 0])
circle(r=radius);
}
}
// stem related stuff
// bottom we can use to anchor the stem, just a big ol cube with the inside of
// the keycap hollowed out
module inside(){
difference(){
translate([0,0,50]) cube([100000,100000,100000],center=true);
// NOTE: you're saying hey, if this is the inside why aren't we doing
// wall_thickness, keytop_thickness? well first off congratulations for
// figuring that out cuz it's a rat's nest in here. second off
// due to how the minkowski_key function works that isn't working out right
// now. it's a simple change if is_minkowski is implemented though
shape(0, 0);
}
}
module cherry_stem(){
// cross length
cross_length = 4.4;
//extra vertical cross length - the extra length of the up/down bar of the cross
extra_vertical_cross_length = 1.1;
//dimensions of connector
// outer cross extra length in x
extra_outer_cross_width = 2.10;
// outer cross extra length in y
extra_outer_cross_height = 1.0;
// dimensions of cross
// horizontal cross bar width
horizontal_cross_width = 1.4;
// vertical cross bar width
vertical_cross_width = 1.3;
// cross depth, stem height is 3.4mm
cross_depth = 4;
difference(){
union(){
if (stem_profile != 2){
translate([
-(cross_length+extra_outer_cross_width)/2,
-(cross_length+extra_outer_cross_height)/2,
stem_inset
])
cube([ // the base of the stem, the part the cruciform digs into
cross_length+extra_outer_cross_width,
cross_length+extra_outer_cross_height,
50
]);
} else {
cylinder(
d = cross_length+extra_outer_cross_height,
h = 50
);
}
if (has_brim == 1){ cylinder(r=brim_radius,h=brim_depth); }
}
//the cross part of the steam
translate([0,0,(cross_depth)/2 + stem_inset]){
cube([vertical_cross_width,cross_length+extra_vertical_cross_length,cross_depth], center=true );
cube([cross_length,horizontal_cross_width,cross_depth], center=true );
}
}
}
module alps_stem(){
cross_depth = 40;
width = 4.45;
height = 2.25;
base_width = 12;
base_height = 15;
translate([0,0,cross_depth/2 + stem_inset]){
cube([width,height,cross_depth], center = true);
}
}
//whole connector, alps or cherry, trimmed to fit
module connector(has_brim){
difference(){
//TODO can I really not do an array index here?
translate([-unit * stem_offset, 0, 0])
union(){
if(stem_profile == 0 || stem_profile == 2) cherry_stem();
if(stem_profile == 1) alps_stem();
}
inside();
}
}
//stabilizer connectors
module stabilizer_connectors(has_brim){
translate([stabilizer_distance,0,0]) connector(has_brim);
translate([-stabilizer_distance,0,0]) connector(has_brim);
}
//shape related stuff
//general shape of key. used for inside and outside
module shape(thickness_difference, depth_difference){
if (inverted_dish == 1){
difference(){
union(){
shape_hull(thickness_difference, depth_difference, 1);
dish(depth_difference);
}
outside(thickness_difference);
}
} else{
difference(){
shape_hull(thickness_difference, depth_difference, 1);
dish(depth_difference);
}
}
}
// conicalish clipping shape to trim things off the outside of the keycap
// literally just a key with height of 2 to make sure nothing goes awry with dishing etc
module outside(thickness_difference){
difference(){
cube([100000,100000,100000],center = true);
shape_hull(thickness_difference, 0, 2);
}
}
// super basic hull shape without dish
// modifier multiplies the height and top differences of the shape,
// which is only used for dishing to cut the dish off correctly
// height_difference used for keytop thickness
module shape_hull(thickness_difference, depth_difference, modifier){
hull(){
// bottom_key_width + (key_length -1) * unit is the correct length of the
// key. only 1u of the key should be bottom_key_width long; all others
// should be 1u
roundedRect([total_key_width - thickness_difference, total_key_height - thickness_difference, .001],1.5);
//height_difference outside of modifier because that doesnt make sense
translate([0,top_skew,total_depth * modifier - depth_difference])
rotate([-top_tilt,0,0])
roundedRect([total_key_width - thickness_difference - width_difference * modifier, total_key_height - thickness_difference - height_difference * modifier, .001],1.5);
}
}
//dish related stuff
//dish selector
module dish(depth_difference){
if(dish_type == 0){ // cylindrical dish
cylindrical_dish(depth_difference);
}
else if (dish_type == 1) { // spherical dish
spherical_dish(depth_difference);
}
else if (dish_type == 2){ // SIDEWAYS cylindrical dish - used for spacebar
sideways_cylindrical_dish(depth_difference);
}
else if (dish_type == 3){
// no dish
}
}
module cylindrical_dish(depth_difference){
/* we do some funky math here
* basically you want to have the dish "dig in" to the keycap x millimeters
* in order to do that you have to solve a small (2d) system of equations
* where the chord of the spherical cross section of the dish is
* the width of the keycap.
*/
// the distance you have to move the dish up so it digs in dish_depth millimeters
chord_length = (pow(top_total_key_width, 2) - 4 * pow(dish_depth, 2)) / (8 * dish_depth);
//the radius of the dish
rad = (pow(top_total_key_width, 2) + 4 * pow(dish_depth, 2)) / (8 * dish_depth);
if (inverted_dish == 1){
translate([dish_skew_x, top_skew + dish_skew_y, total_depth - depth_difference])
rotate([90-top_tilt,0,0])
translate([0,-chord_length,0])
cylinder(h=100,r=rad, $fn=1024, center=true);
}
else{
translate([dish_skew_x, top_skew + dish_skew_y, total_depth - depth_difference])
rotate([90-top_tilt,0,0])
translate([0,chord_length,0])
cylinder(h=100,r=rad, $fn=1024, center=true);
}
}
module spherical_dish(depth_difference){
//same thing as the cylindrical dish here, but we need the corners to just touch - so we have to find the hypotenuse of the top
chord = pow((pow(top_total_key_width,2) + pow(top_total_key_height, 2)),0.5); //getting diagonal of the top
// the distance you have to move the dish up so it digs in dish_depth millimeters
chord_length = (pow(chord, 2) - 4 * pow(dish_depth, 2)) / (8 * dish_depth);
//the radius of the dish
rad = (pow(chord, 2) + 4 * pow(dish_depth, 2)) / (8 * dish_depth);
if (inverted_dish == 1){
translate([dish_skew_x, top_skew + dish_skew_y, total_depth - depth_difference])
rotate([-top_tilt,0,0])
translate([0,0,-chord_length])
//NOTE: if your dish is long at all you might need to increase this number
sphere(r=rad, $fn=512);
}
else{
translate([dish_skew_x, top_skew + dish_skew_y, total_depth - depth_difference])
rotate([-top_tilt,0,0])
translate([0,0,chord_length])
sphere(r=rad, $fn=256);
}
}
module sideways_cylindrical_dish(depth_difference){
chord_length = (pow(top_total_key_height, 2) - 4 * pow(dish_depth, 2)) / (8 * dish_depth);
rad = (pow(top_total_key_height, 2) + 4 * pow(dish_depth, 2)) / (8 * dish_depth);
if (inverted_dish == 1){
translate([dish_skew_x, top_skew + dish_skew_y, total_depth - depth_difference])
rotate([90,top_tilt,90])
translate([0,-chord_length,0])
cylinder(h=total_key_width + 20,r=rad, $fn=1024, center=true); // +20 just cuz
}
else{
translate([dish_skew_x, top_skew + dish_skew_y, total_depth - depth_difference])
rotate([90,top_tilt,90])
translate([0,chord_length,0])
cylinder(h=total_key_width + 20,r=rad, $fn=1024, center=true);
}
}
//actual full key with space carved out and keystem/stabilizer connectors
module key(){
union(){
difference(){
shape(0, 0);
shape(wall_thickness, keytop_thickness);
}
}
connector(has_brim);
if (stabilizers == 1){
stabilizer_connectors(has_brim);
}
}
// ACTUAL OUTPUT
difference(){
key();
// preview cube, for seeing inside the keycap
//cube([100,100,100]);
}
//minkowski_key();
// Experimental stuff
// key rounded with minkowski sum. still supports wall and keytop thickness.
// use in actual output section. takes a long time to render with dishes.
// required for keycap 11, G20 keycap.
module minkowski_key(){
union(){
difference(){
minkowski(){
shape(minkowski_radius*2, minkowski_radius);
difference(){
sphere(r=minkowski_radius, $fn=24);
translate([0,0,-minkowski_radius])
cube([2*minkowski_radius,2*minkowski_radius,2*minkowski_radius], center=true);
}
}
shape(wall_thickness, keytop_thickness);
}
}
connector(has_brim);
if (stabilizers == 1){
stabilizer_connectors(has_brim);
}
}
// NOT 3D, NOT CENTERED
// corollary is roundedRect
module fakeISOEnter(thickness_difference){
z = 0.001;
radius = 2;
/*TODO I figured it out. 18.16 is the actual keycap width / height,
whereas 19.01 is the unit. ISO enter obeys that just like everything else,
which means that it's height is 18.16 * 2 + (19.01 - 18.16) or, two
keycap heights plus the space between them, also known as 18.16 +
(19.01 * (key_height - 1)). this is followed by the width too. should fix
to make this finally work*/
unit = 18.16; // TODO probably not
// t is all modifications to the polygon array
t = radius + thickness_difference/2;
pointArray = [
[0 + t,0 + t],
[unit*1.25 - t, 0 + t],
[unit*1.25 - t, unit*2 - t],
[unit*-.25 + t, unit*2 - t],
[unit*-.25 + t, unit*1 + t],
[0 + t, unit*1 + t]
];
minkowski(){
circle(r=radius, $fn=24);
polygon(points=pointArray);
}
}
//corollary is shape_hull
module ISOEnterShapeHull(thickness_difference, depth_difference, modifier){
unit = 18.16; // TODO probably not
height = 8 - depth_difference;
length = 1.5 * unit; // TODO not used. need for dish
translate([-0.125 * unit, unit*.5]) linear_extrude(height=height*modifier, scale=[.8, .9]){
translate([-unit*.5, -unit*1.5]) minkowski(){
fakeISOEnter(thickness_difference);
}
}
}
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