MEngine/gearbox.scad

use <PolyGear/PolyGear.scad>
use <PolyGear/PolyGearBasics.scad>
use <PolyGear/shortcuts.scad>
use <lovejoy.scad>

shaftd=9.49; // 3/8"
shaftback=21.41 + shaftd/2;
shaftz=21.75+shaftd/2;
flat=9.30;
ringh=3;
ringw=2;

GMod=.8;

module shaft(h, shaftd) {
	difference() {
		cylinder(d=shaftd, h=h, $fs=.1);
		for (r=[0,120,240])
			rotate([0,0,r]) translate([flat/2,-shaftd/2,-.05]) 
				cube([shaftd/2,shaftd, h + .1]);
	}	
}

module drive_gear() {
	difference() {
		spur_gear(m=2, n=12, z=ringh, chamfer=10);
		translate([0,0,-(ringh+2)/2]) shaft(h=ringh+2, shaftd=4);
	}
}

module planet_gear(nt=10, gh, sh=4, m, ha=30) {
	gfn      =  $preview ? 9 : 18;
	difference() {
		rotate([0,0,36/2]) spur_gear(m=m, n=nt, z=gh, chamfer=20, helix_angle=-ha, $fn=gfn, x=-.2);
		cylinder(d=sh, h=gh+.1, $fs=.1, center=true);
	}
}

module planet_carrier(nt=7, np=7, ns=49, m=GMod, incolor=true, pcolor="blue", ccolor="green", ha=30, rh=ringh) {
	
	gfn      = $preview ? 9 : 15;
	cfs      = $preview ? .1 : 2;
	ratio    = ns/np;
	meshd    = m*(ns+nt)/2;
	planet_r = [ for (i = [0: 360/np : 360]) i + 90];
	//planet_w = 180/-m*(nt/ns);
	planet_w = ns % nt;
	bodr     = m*(ns+2*nt) - 4;
	echo("Carrier Body Radius: ", bodr);

	planet_color = incolor ? pcolor : undef;
	carrier_color = incolor ? ccolor : undef;
	color(planet_color) for (r=planet_r) {
		rotate([0,0,r]) translate([meshd,0]) rotate([0,0,planet_w-r])
			planet_gear(nt=nt, sh=4, m=m, gh=rh, ha=herringbone(helix=30, $fn=gfn));
	}
	color(carrier_color) translate([0,0,0])  difference() {
		union() {
				rotate([0,0,30])
					cylinder(d=bodr, h=rh+2.4, center=true,$fs=cfs);
		}
		translate([0,0,ringh+1.2]) cylinder(d=309, h=2.3, center=true, $fs=cfs);
		// Planet Orbits
		for (r=planet_r) {
			rotate([0,0,r]) translate([meshd,0])
				difference() { 
					cylinder(d=2+m+nt*m, h=rh+.4, center=true, $fs=cfs);
					cylinder(d=4-.4, h=rh+.6, center=true, $fs=cfs);
				}
		}
		
		// Sun void
		cylinder(d=2+m+ns*m, h=rh+.4, center=true, $fs=cfs);
		cylinder(d=10, h=rh+.4, center=false, $fs=cfs);

	}
}

module motor_gear(GMod=.8, z=8.25) {
	//z=2*ringh;

//	translate([0,0]) spur_gear(m=GMod, n=5, z=z, helix_angle=-30);
	linear_extrude(height=z, twist=72*z/8.25)
		projection() spur_gear(m=GMod, n=5, z=1, helix_angle=0);

}

module sun_gear(GMod=.8, nt=49, ha=30, h=2*ringh) {
	gfn = $preview ? 9 : 15;
	sd	= 5.1;
	spur_gear(m=GMod, n=nt, z=h, chamfer=20, helix_angle=ha, x=-.2, $fn=gfn);
	cylinder(d=7.9, h=h+9.2, center=false, $fs=.1);
	translate([0,7.9/2,h+6 +.2]) cube([2.95,2,6], center=true);
	color("red")
		translate([0,0,h/2+3+sd])
			input_gear(nt=55, ha=-30);
}

module input_gear(GMod=.8, nt=49, ha=30, h=2*ringh) {
	spur_gear(m=GMod, n=nt, z=h, chamfer=00, helix_angle=ha);
}

module ring_gear(np=14, ns=49, m=GMod, ww=1.5, rh=ringh) {
	n=2*np + ns;
	bodr = m*(ns+np/2) + .2;
	bd = n*m + 2*ww;
	ha = herringbone(helix=-30, $fn=9);
	gfn =  $preview ? 9 : 15;
	cfs      = $preview ? .1 : 2;
	ch= rh;
	difference() {
		intersection () {
			cylinder(h=ch+2*ww, d=bd, center=true);
			 //translate([-4,0,-5]) cube([50,60,20]);
		}
		//#translate([0,0,ringh/2+.7]) 
		// middle clearance
		cylinder(h=ch+.6, d=bd-2*ww-2, center=true, $fs=cfs);
		cylinder(h=ch+.6+2, d=bodr, center=true, $fs=cfs);
		spur_gear(m=m, n=n, z=rh+.2, chamfer=00, helix_angle=ha, 
			type=1, x=.3, ded=-.2, add=.2, $fn=gfn);
		// Top Opening
		translate([0,0,(ch/2 +ww/2)]) cylinder(h=ww+.1, d=11, center=true);
		// Bottom Opening
		translate([0,0,-(ch/2 +ww/2)]) cylinder(h=ww+.1, d=11, center=true);
	}
}

module gearbox(ww) {
	motor_r = 3*360/14 -90;
	m=GMod;
	ns=9;
	np=7;
	nt=24;
	nr=ns+2*nt;

	R=-nr/ns;

	echo("R= ", R);
	echo("Output: ", (1/(1+R)));
	echo("Ring Size: ", nr);

	color(sun_color) sun_gear(nt=ns, h=ringh, ha=herringbone(helix=30, $fn=9));
	planet_carrier(incolor=incolor, ns=ns, np=3, nt=nt);
	difference() {
		//rr = 180/(ns+2*nt);
		rr=0;
		rotate([0,0,rr]) ring_gear(np=nt,ns=ns, ww=5);
		translate([0,-shaftz-1,0]) cube([20,2,ringh+2*ww+.2], center=true);
	}
}

incolor=true;
drive_color = incolor ? "green" : undef;
sun_color = incolor ? "yellow" : undef;

ww=5;
translate([0,shaftz,0]) {
	difference() { 
		gearbox(ww=ww);
		//translate([-30,-30])
			//cube([60,60,40]);
		//translate([0,-shaftz-1,0]) cube([20,2,ringh+2*ww+.2], center=true);2

	}
	// Input Drive
	mgt=5;
	tgt=49;
	igt=55;
	im=.8;
	mmd=-im*(tgt+mgt)/2;
	imd=-im*(igt+tgt)/2;
	translate([0,0,5.1+3+ringh/2]) {
		//color("red") input_gear(nt=igt, ha=-30);
		echo("Motor Transmission D: ", mmd);
		translate([imd,0]) color("darkslategrey") input_gear();
		echo("Motor Drive D: ", mmd+imd);
		 translate([mmd+imd,0,-5]) rotate([0,0,5/8.25*72]) color("white") motor_gear();
	}
	
	// Input Body
	Ri(D);
}

// Base Plate
translate([-60,0,-5]) cube([90,3,10]);

// Drive gear
//%rotate([0,0,motor_r]) translate([-m*(49+5)/2,0]) color(drive_color) {
//	z=8.25;
//	rotate([0,0,(ns-np) * motor_r *.8 +180]) { 
//		translate([0,0,0]) motor_gear(z=z);
//		translate([0,0,-z]) motor_gear(z=z);
//	}
//}



//rotate([0,0,36]) %sun_gear();

//translate([20,0,0])		spur_gear(m=.64, n=13, z=ringh, chamfer=10, helix_angle=30);

//rotate([0,0,0]) spur_gear(m=.64, n=13, z=ringh, chamfer=10, helix_angle=-30);