From 01590f58c29a64d03d36ba04af4d106f9140d166 Mon Sep 17 00:00:00 2001
From: Luke Hubmayer-Werner <mongoose41@gmail.com>
Date: Tue, 4 Feb 2025 03:37:01 +1030
Subject: [PATCH] Rough model for locking guitar tuners (holes should be
 accurate)

---
 LockingGuitarTuner.scad | 71 +++++++++++++++++++++++++++++++++++++++++
 common.scad             |  9 ++++++
 2 files changed, 80 insertions(+)
 create mode 100644 LockingGuitarTuner.scad

diff --git a/LockingGuitarTuner.scad b/LockingGuitarTuner.scad
new file mode 100644
index 0000000..f23f585
--- /dev/null
+++ b/LockingGuitarTuner.scad
@@ -0,0 +1,71 @@
+include <common.scad>
+module LockingGuitarTuner(holes=false) {
+	tolerance = 0.25;
+	d_post_cutout = 10.0 + tolerance;
+	h_post_cutout = 14.0;
+	d_post = 5.8;
+	h_post = 26.0;  // from bottom of cutout to top
+	t_base = 9;  // Thickness of underside assembly
+	d_screw_hole = 3;
+	screw_diameter = 2.0;
+	screw_depth = 5.0;
+	d_tag = 15.4;
+	w_tag = d_tag;
+	l_tag = 19.0;
+	// Rest is placeholder from UBassTuner
+	l_wormshaft_ear = 36;
+	d_wormshaft_ear = 33.4+0.6;
+	l_wormshaft_collar = 12;
+	d_wormshaft_collar = 6.4;
+	d_wormshaft_collar_max = 7.6;
+	$fn=72;
+
+	module tuner_footprint_extrude(h) {
+		// linear_extrude on tuner_footprint() segfaults for no reason
+		// src/openscad/src/geometry/linear_extrude.cc:409: std::unique_ptr<Geometry> extrudePolygon(const LinearExtrudeNode&, const Polygon2d&): Assertion `poly.isSanitized()' failed.
+		hull() {
+			translate([-w_tag/2, -l_tag+d_tag/2, 0]) cube([w_tag, l_tag-w_tag, h]);
+			cylinder(h=h, d=d_tag);
+		}
+	}
+	module Holes() {
+		cylinder(d=d_post_cutout, h=h_post_cutout);
+		rotate([0, 0, 45]) translate([0, 10.5]) linear_extrude(screw_depth) screw_hole_lobe(screw_diameter, screw_diameter+1, 5);
+	}
+
+	module TunerPreview() {
+		clear_color = [1,0,0,0.6];
+		color("grey") translate([0,0,-t_base]) tuner_footprint_extrude(t_base);
+		// screw
+		color(clear_color) rotate([0, 0, 45]) translate([0, 10.5]) cylinder(h=screw_depth, d=screw_diameter);
+		// screw tab
+		color("grey") rotate([0, 0, 45]) translate([0,0,-2]) hull() {
+			cylinder(h=2, d=d_post_cutout);
+			translate([0, 10.5]) cylinder(h=2, d=screw_diameter+2);
+		}
+		// peg
+		cylinder(h=h_post_cutout, d=d_post_cutout);
+		cylinder(h=h_post, d=d_post);
+
+		// PLACEHOLDER
+		// wormshaft and ear
+		translate([w_tag/2, -6, -t_base/2]) {
+			hull() {
+				rotate([0, 90, 0]) cylinder(h=0.1, d=d_wormshaft_collar_max);
+				translate([8, 0, 0]) rotate([0, 90, 0]) cylinder(h=0.1, d=d_wormshaft_collar);
+			}
+			rotate([0, 90, 0]) cylinder(h=l_wormshaft_collar, d=d_wormshaft_collar);
+			// ear clearance
+			color(clear_color) hull() {
+				translate([l_wormshaft_collar, 0, 0]) rotate([0, 90, 0]) cylinder(h=0.1, d=d_wormshaft_collar);
+				translate([l_wormshaft_ear, 0, 0]) rotate([0, 90, 0]) cylinder(h=0.1, d=d_wormshaft_ear);
+			}
+		}
+	}
+
+	if (holes)
+		Holes();
+	else
+		TunerPreview();
+}
+// LockingGuitarTuner(holes=true);
diff --git a/common.scad b/common.scad
index 4ee925c..61c67a2 100644
--- a/common.scad
+++ b/common.scad
@@ -54,6 +54,15 @@ module rotate_around(angles, pt) {
 				children();
 }
 
+module screw_hole_lobe(ID, OD, lobes=3, fn=90) {
+	difference() {
+		circle(d=OD, $fn=fn);
+		for (a=[0:360/lobes:360])
+			translate((OD/2)*[cos(a), sin(a)])
+				circle(d=OD-ID, $fn=fn);
+	}
+}
+
 // We can't use Droid Sans Japanese because the rendering library is really dumb and will pick the wrong Droid Sans. CJK fonts must be singular files.
 JP_Serif_Font = "New Tegomin";
 JP_Sans_Font = "Yuji Boku";