1 files changed, 102 insertions, 0 deletions
diff --git a/fader_knob.scad b/fader_knob.scad
new file mode 100644
index 0000000..7456fc3
--- /dev/null
+++ b/fader_knob.scad
@@ -0,0 +1,102 @@
+
+/* base */
+base_w = 10;
+roundness = 0.5; /* should match offset constraint in sovlespace */
+wall_thickness = 1.0;
+
+side_dxf = "knob_side.dxf";
+
+/* stem */
+stem_wall_thickness = 1.5;
+stem_w = 2.4;
+stem_h = 6.8;
+cut_corners_w = 1.6;
+cut_corners_h = 2.0;
+
+/* don't touch */
+lots = 1000;
+eps = 0.01;
+
+module offset_shell(offx) {
+    intersection() {
+        translate([-lots/2, 0, 0])
+        square([lots, lots]);
+        
+        offset(r=-offx)
+        union() {
+            children();
+            mirror([0, 1, 0]) children();
+        }
+    }
+}
+
+module dxf_shell(file, w, d, r) {
+    intersection() {
+        translate([0, 0, lots/2])
+        cube([lots, lots, lots], center=true);
+        
+        difference() {
+            minkowski(){
+                sphere(r=r, $fn=32);
+                
+                rotate([90, 0, 0])
+                linear_extrude(height=w - 2*r, center=true)
+                offset_shell(r)
+                import(file, $fn=128);
+            }
+            
+            translate([0, 0, -eps])
+            rotate([90, 0, 0])
+            linear_extrude(height=w-2*d, center=true)
+            offset_shell(d)
+            import(file, $fn=128);
+        }
+    }
+}
+
+module stem() {
+    difference() {
+        cube([stem_h + 2*stem_wall_thickness, stem_w + 2*stem_wall_thickness, lots], center=true);
+        cube([stem_h, stem_w, lots], center=true);
+        
+        translate([0, 0, -lots/2])
+        cube([lots, lots, lots], center=true);
+        
+        translate([-(stem_h+stem_wall_thickness)/2-eps, -(stem_w+stem_wall_thickness)/2-eps, 0])
+        cube([cut_corners_h, cut_corners_w, lots], center=true);
+        translate([(stem_h+stem_wall_thickness)/2+eps, -(stem_w+stem_wall_thickness)/2-eps, 0])
+        cube([cut_corners_h, cut_corners_w, lots], center=true);
+        translate([-(stem_h+stem_wall_thickness)/2-eps, (stem_w+stem_wall_thickness)/2+eps, 0])
+        cube([cut_corners_h, cut_corners_w, lots], center=true);
+        translate([(stem_h+stem_wall_thickness)/2+eps, (stem_w+stem_wall_thickness)/2+eps, 0])
+        cube([cut_corners_h, cut_corners_w, lots], center=true);
+    }
+}
+
+ridge_w = 0.8;
+ridge_f = 0.3;
+ridge_h = 3.7;
+
+difference() {
+    union () {
+        dxf_shell(side_dxf, base_w, wall_thickness, roundness);
+
+        intersection() {
+            stem();
+            
+            rotate([90, 0, 0])
+            linear_extrude(height=base_w, center=true)
+            import(side_dxf, $fn=128);
+        }
+    }
+    
+    translate([0, -base_w/2 - ridge_w*ridge_f, -eps])
+    cylinder(d=ridge_w, h=lots, $fn=32);
+    
+    translate([0, base_w/2 + ridge_w*ridge_f, -eps])
+    cylinder(d=ridge_w, h=lots, $fn=32);
+    
+    translate([0, 0, ridge_h])
+    rotate([90, 0, 0])
+    cylinder(d=ridge_w, h=lots, center=true, $fn=32);    
+}
+\ No newline at end of file