Trackball/hardware/external/cherry_mx.scad

$fn=60;
/**
a cherry mx switch.

most of the measurements done with a caliper. some taken from
http://geekhack.org/index.php?topic=47744.0

This is just to illustrate and to drop in a a gross reference. It is mostly artistic apart from the steam and mounting plate dimensions
*/

// slightly adapted from https://www.thingiverse.com/thing:421524

module mx_switch(t = 0) {

translate([0, 0, 9.25])
//translate([0,0,-3])
{

	//1. steam
	color("#503000")
    translate([0, 0, -3.9 * t]) {
		//1.1. l-r tab is 1.35mm
		translate([0,0,-3.62/2])
			cube([1.35,4.5,3.62], center=true);
		//1.2. f-b tab is 1.15mm. it has a smal notch that i will ignore.
		translate([0,0,-3.62/2])
			cube([4.5,1.15,3.62], center=true);
		//1.3. base. it has a chamfered top that i will ignore.
		translate([0,0,-5.62])
			cube([7.2,5.56,4], center=true);
	}
	// 2. top
	color("grey"){
		difference(){
			// make a trapezoid with the general shape (volume?) of the top
			hull(){
				translate([0,0,-4]) //distance from top of switch... some i measured 3.9 others 4.2... so leaving at 4
					cube([9.87,10.62,0.1], center=true);
				translate([0,0,-4 -5.2]) // bottom has a measured 5.3... so move 5.2 and use the 0.1 bellow
					cube([14.58,14.58,0.1], center=true);
			}
            
			translate([0, 0, -5.8])
            cube([7.2,5.56,4], center=true);
            

		// and subtract:
		// the front led. NOTE: totally off... measured by eye. just for astetics
		// adding just so there is a visual cue of the direction
			translate([0,-4.7,-6])
				cylinder(r=3/2, h=6, center=true);
			translate([0,-5.5,-6])
				cube([8,4,5], center=true);
		// the four corners
			// TODO waste of time? this is all for looks, you shouldn't invade any of that space anyway...
		}
	}

	// 3. bottom
	color("green")
		// 3.1 main body volume
		hull(){
				translate([0,0,-4 -5.3]) //steam + top
					cube([13.98,13.98,0.1], center=true);
				translate([0,0,-4 -5.3 -2.2]) //steam + top + straigth part
					cube([13.98,13.98,0.1], center=true);
				translate([0,0,-4 -5.3 -5.5]) //steam + top + bottom (measured 5.5)
					cube([12.74,13.6,0.1], center=true);
		}
		// 3.2 tabs
		// note: only measured the lenght, if they are slightly off-center, this will be all wrong :)
		color("black")
		difference(){
			translate([0,0,-4 -5.3 -0.82/2]) //steam + top
				cube([15.64,15.64,0.82], center=true);
			translate([0,0,-4 -5.3 -0.82/2  ]) // front-back cut
				cube([5.64,20,0.82 +2], center=true);
			translate([0,0,-4 -5.3 -0.82/2  ]) //side cut
				cube([20,11.64,0.82 +2], center=true);
		}

		// 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
		color("white"){
			// 3.3.1 top
			translate([0,0,-4 -5.3 -0.82/2  ]) // front-back cut
				cube([1.82,16.33,0.82], center=true);
			// 3.3.2 bottom
			difference(){
				hull(){
					translate([0,0,-4 -5.3 -0.82/2 -1.76  ]) // front-back cut
						cube([3.65,14,0.1], center=true);
					translate([0,0,-4 -5.3 -0.82/2 -2.2  ]) // front-back cut
						cube([3.65,14.74,0.1], center=true);
					translate([0,0,-4 -5.3 -0.82/2 -2.89  ]) // front-back cut
						cube([3.65,14,0.1], center=true);
				}
				translate([0,0,-4 -5.3 -0.82/2 -1.76   ]) // front-back cut
					cube([2.2,20,4], center=true);

			}
		}

		// 4. bottom guides
		// again, i'm assuming everything is centered...
		color("darkGreen"){
			// 4.1 cylinder
			translate([0,0,-4 -5.3 -5.5 -2/2]) //steam + top + bottom (measured 5.5)
				cylinder(r=3.85/2, h=2, center=true);
			translate([0,0,-4 -5.3 -5.5 -2 -1/2]) //steam + top + bottom (measured 5.5)
				cylinder(r2=3.85/2, r1=2.8/2, h=1, center=true);
			// 4.2 PCB pins
			translate([4.95,0,-4 -5.3 -5.5 -2/2]) //steam + top + bottom (measured 5.5)
				cylinder(r=1.6/2, h=2, center=true);
			translate([4.95,0,-4 -5.3 -5.5 -2 -1/2]) //steam + top + bottom (measured 5.5)
				cylinder(r2=1.6/2, r1=1/2, h=1, center=true);
			translate([-4.95,0,-4 -5.3 -5.5 -2/2]) //steam + top + bottom (measured 5.5)
				cylinder(r=1.6/2, h=2, center=true);
			translate([-4.95,0,-4 -5.3 -5.5 -2 -1/2]) //steam + top + bottom (measured 5.5)
				cylinder(r2=1.6/2, r1=1/2, h=1, center=true);
		}

		// 5. pins
		color("orange"){
			translate([-3.77,2.7,-4 -5.3 -5.5 -3.1/2]) //steam + top + bottom (measured 5.5)
				cube([.86, 0.2,3.1], center=true);
			translate([2.7,5.2,-4 -5.3 -5.5 -3.1/2]) //steam + top + bottom (measured 5.5)
				cube([.86, 0.2,3.1], center=true);
		}

}

}

mx_switch();