concertina

cherry_mx.scad

  1/**
  2a cherry mx switch.
  3
  4most of the measurements done with a caliper. some taken from
  5http://geekhack.org/index.php?topic=47744.0
  6
  7This is just to illustrate and to drop in a a gross reference. It is mostly artistic apart from the steam and mounting plate dimensions
  8*/
  9
 10// move the whole thing 3mm to give the empty space in usual keycaps.
 11// that is, the extra space inside a keycap female connector.
 12// i do that since i create all my keycaps with 0,0,0 being the internal base of the keycap
 13module switch() {
 14	//1. steam
 15	color("brown"){
 16		//1.1. l-r tab is 1.35mm
 17		translate([0,0,-3.62/2])
 18			cube([1.35,4.5,3.62], center=true);
 19		//1.2. f-b tab is 1.15mm. it has a smal notch that i will ignore.
 20		translate([0,0,-3.62/2])
 21			cube([4.5,1.15,3.62], center=true);
 22		//1.3. base. it has a chamfered top that i will ignore.
 23		translate([0,0,-5.62])
 24			cube([7.2,5.56,4], center=true);
 25	}
 26	// 2. top
 27	color("grey"){
 28		difference(){
 29			// make a trapezoid with the general shape (volume?) of the top
 30			hull(){
 31				translate([0,0,-4]) //distance from top of switch... some i measured 3.9 others 4.2... so leaving at 4
 32					cube([9.87,10.62,0.1], center=true);
 33				translate([0,0,-4 -5.2]) // bottom has a measured 5.3... so move 5.2 and use the 0.1 bellow
 34					cube([14.58,14.58,0.1], center=true);
 35			}
 36
 37		// and subtract:
 38		// the front led. NOTE: totally off... measured by eye. just for astetics
 39		// adding just so there is a visual cue of the direction
 40			translate([0,-4.7,-6])
 41				cylinder(r=3/2, h=6, center=true);
 42			translate([0,-5.5,-6])
 43				cube([8,4,5], center=true);
 44		// the four corners
 45			// TODO waste of time? this is all for looks, you shouldn't invade any of that space anyway...
 46		}
 47	}
 48
 49	// 3. bottom
 50	color("green")
 51		// 3.1 main body volume
 52		hull(){
 53				translate([0,0,-4 -5.3]) //steam + top
 54					cube([13.98,13.98,0.1], center=true);
 55				translate([0,0,-4 -5.3 -2.2]) //steam + top + straigth part
 56					cube([13.98,13.98,0.1], center=true);
 57				translate([0,0,-4 -5.3 -5.5]) //steam + top + bottom (measured 5.5)
 58					cube([12.74,13.6,0.1], center=true);
 59		}
 60		// 3.2 tabs
 61		// note: only measured the lenght, if they are slightly off-center, this will be all wrong :)
 62		color("black")
 63		difference(){
 64			translate([0,0,-4 -5.3 -0.82/2]) //steam + top
 65				cube([15.64,15.64,0.82], center=true);
 66			translate([0,0,-4 -5.3 -0.82/2  ]) // front-back cut
 67				cube([5.64,20,0.82 +2], center=true);
 68			translate([0,0,-4 -5.3 -0.82/2  ]) //side cut
 69				cube([20,11.64,0.82 +2], center=true);
 70		}
 71
 72		// 3.3 tab (plate snap on). to use this mechanically, you have to take into account the bending (as it will move the bottom part slightly up...) just for gross reference here for now
 73		color("white"){
 74			// 3.3.1 top
 75			translate([0,0,-4 -5.3 -0.82/2  ]) // front-back cut
 76				cube([1.82,16.33,0.82], center=true);
 77			// 3.3.2 bottom
 78			difference(){
 79				hull(){
 80					translate([0,0,-4 -5.3 -0.82/2 -1.76  ]) // front-back cut
 81						cube([3.65,14,0.1], center=true);
 82					translate([0,0,-4 -5.3 -0.82/2 -2.2  ]) // front-back cut
 83						cube([3.65,14.74,0.1], center=true);
 84					translate([0,0,-4 -5.3 -0.82/2 -2.89  ]) // front-back cut
 85						cube([3.65,14,0.1], center=true);
 86				}
 87				translate([0,0,-4 -5.3 -0.82/2 -1.76   ]) // front-back cut
 88					cube([2.2,20,4], center=true);
 89
 90			}
 91		}
 92
 93		// 4. bottom guides
 94		// again, i'm assuming everything is centered...
 95		color("darkGreen"){
 96			// 4.1 cylinder
 97			translate([0,0,-4 -5.3 -5.5 -2/2]) //steam + top + bottom (measured 5.5)
 98				cylinder(r=3.85/2, h=2, center=true);
 99			translate([0,0,-4 -5.3 -5.5 -2 -1/2]) //steam + top + bottom (measured 5.5)
100				cylinder(r2=3.85/2, r=2.8/2, h=1, center=true);
101			// 4.2 PCB pins
102			translate([4.95,0,-4 -5.3 -5.5 -2/2]) //steam + top + bottom (measured 5.5)
103				cylinder(r=1.6/2, h=2, center=true);
104			translate([4.95,0,-4 -5.3 -5.5 -2 -1/2]) //steam + top + bottom (measured 5.5)
105				cylinder(r2=1.6/2, r=1/2, h=1, center=true);
106			translate([-4.95,0,-4 -5.3 -5.5 -2/2]) //steam + top + bottom (measured 5.5)
107				cylinder(r=1.6/2, h=2, center=true);
108			translate([-4.95,0,-4 -5.3 -5.5 -2 -1/2]) //steam + top + bottom (measured 5.5)
109				cylinder(r2=1.6/2, r=1/2, h=1, center=true);
110		}
111
112		// 5. pins
113		color("orange"){
114			translate([-3.77,2.7,-4 -5.3 -5.5 -3.1/2]) //steam + top + bottom (measured 5.5)
115				cube([.86, 0.2,3.1], center=true);
116			translate([2.7,5.2,-4 -5.3 -5.5 -3.1/2]) //steam + top + bottom (measured 5.5)
117				cube([.86, 0.2,3.1], center=true);
118		}
119
120}