GuitarModels/NylonTuner.scad

// Classical Guitar style headstock tuners, comes in a mirrored pair of 3 machine heads with a metal plate

module NylonTuner(ear_extra_diameter = 0, ear_extra_height = 0) {
	cyl_hd_fn = $preview ? 32 : 512;
	cyl_ld_fn = $preview ? 24 : 72;
	earshaft_diameter = 6.3;
	ear_total_height = 22.5;
	ear_height = 13+3;
	ear_diameter = 22.1 + ear_extra_diameter;
	peg_diameter = 6.0;  // Closer to 5.7mm
	peg_length = 28;
	peg_spacing = 35.0;
	peg_string_diameter = 2.2+0.1;
	plate_width = 16.6 + 3.0;
	plate_length = 112;
	plate_thickness = 1.1;  // Not really used for our purposes
	outer_thickness = 10;
	// screwhole_diameter = 3;
	screwtap_diameter = 1.7;
	screw_length = 7.1 - plate_thickness;

	module peg() {
		render() difference() {
			cylinder(h=peg_length, d=peg_diameter, $fn=cyl_hd_fn);
			translate([0, 0, 14.1]) rotate([90, 0, 0]) cylinder(h=peg_diameter, d=peg_string_diameter, $fn=cyl_ld_fn, center=true);
			translate([0, 0, 22.7]) rotate([90, 0, 0]) cylinder(h=peg_diameter, d=peg_string_diameter, $fn=cyl_ld_fn, center=true);
		}
	}
	module ear() {
		rotate([0, 90, 0]) cylinder(h=ear_total_height, d=earshaft_diameter, $fn=cyl_ld_fn);
		rotate([0, 90, 0]) translate([0,0,ear_total_height-ear_height]) cylinder(h=ear_height+ear_extra_height, d=ear_diameter, $fn=cyl_hd_fn);
	}

	// Plate and clearance
	translate([-plate_width/2, 0, -outer_thickness]) cube([plate_width, plate_length, outer_thickness]);
	// Pegs
	for (i = [0:2]) {
		// Peg
		translate([0, i*peg_spacing + 16, 0]) peg();
		// Ear
		translate([plate_width/2-1, i*peg_spacing + 22.45, -earshaft_diameter/2-1.5]) ear();
	}
	// Mounting holes
	for (i = [6, 39, 75, 105]) {
		translate([0, i, 0]) cylinder(h=screw_length, d=screwtap_diameter, $fn=cyl_ld_fn);
	}
}