feat(rackmount_ears): asymetry slider

models/rackmount_ears/rackmount_ears.scad

@@ -1,13 +1,26 @@
 // import BOSL2
 include <BOSL2/std.scad>
 
+/* [Hidden] */
 $fn=100;
+CAGE_BOLT_DIAMETER=6.5;
+RACK_BORE_DISTANCE_VERTICAL=15.875;
+RACK_BORE_DISTANCE_TOP_BOTTOM=6.35;
+RACK_MOUNT_SURFACE_WIDTH=15.875;
+RACK_BORE_DISTANCE_HORIZONTAL=RACK_MOUNT_SURFACE_WIDTH/2;
+RACK_HEIGHT_UNIT=44.5; // mm
+
+RACK_WIDTH_10_INCH_INNER=222.25; // mm
+RACK_WIDTH_10_INCH_OUTER=254; // mm
+RACK_WIDTH_19_INCH=482.6; // mm
 
 /* [Base] */
 // automatically chooses the tightest fit for the rackmount ears based on the device width. If true, rack_size will be ignored.
 autosize=true;
 // rack size in inches. If autosize is true, this value will be ignored. Only 10 and 19 inch racks are supported.
 rack_size=10; // [10:10 inch,19:19 inch]
+// Asymetry Slider. If autosize is true, this value will be ignored. CAUTION: there's no sanity check for this slider!
+asymetry=100; // [-150:0.1:150]
 
 // Width of the device in mm. Will determine the width of the rackmount ears depending on rack_size.
 device_width=201;
@@ -38,44 +51,18 @@ device_bore_rows=2;
 // If true, the device will be aligned to the center of the rackmount ear. Otherwise it will be aligned to the bottom of the rackmount ear.
 center_device_bore_alignment=false;
 
-
+/* [Derived] */
-/* [CONSTANTS (shouldn't need to be changed)] */
-CAGE_BOLT_DIAMETER=6.5;
 CHAMFER=min(strength/3,0.5);
-RACK_BORE_DISTANCE_VERTICAL=15.875;
-RACK_BORE_DISTANCE_TOP_BOTTOM=6.35;
-RACK_MOUNT_SURFACE_WIDTH=15.875;
-RACK_BORE_DISTANCE_HORIZONTAL=RACK_MOUNT_SURFACE_WIDTH/2;
 RACK_BORE_WIDTH=RACK_MOUNT_SURFACE_WIDTH-2*max(strength,2);
-RACK_HEIGHT_UNIT=44.5; // mm
 RACK_HEIGHT_UNIT_COUNT=max(1,ceil(device_height/RACK_HEIGHT_UNIT));
 RACK_HEIGHT=RACK_HEIGHT_UNIT_COUNT*RACK_HEIGHT_UNIT; // actual height calculated by height unit size x number of units
 RACK_BORE_COUNT=RACK_HEIGHT_UNIT_COUNT*3; // 3 holes for each units
-RACK_WIDTH_10_INCH_INNER=222.25; // mm
-RACK_WIDTH_10_INCH_OUTER=254; // mm
-RACK_WIDTH_19_INCH=482.6; // mm
-
-// Base assertions
-module validate_params() {
-    valid_rack_sizes=[10,19];
-    if(autosize == false){
-        assert(rack_size == 10 || rack_size == 19, "Invalid rack_size. Only 10 and 19 inch racks are supported. Choose a valid one or set autosize to true.");
-    }
-}
-
-validate_params();
 
 // Debug
 echo("Height: ", RACK_HEIGHT);
 echo("Rack Bore Count: ", RACK_BORE_COUNT);
 
-// Calculate the width of the ear
+
-function get_ear_width(device_width) =
-    device_width > RACK_WIDTH_10_INCH_INNER || autosize == false && rack_size == 19 ?
-        (RACK_WIDTH_19_INCH - device_width) / 2 :
-        (RACK_WIDTH_10_INCH_OUTER - device_width) / 2
-;
-rack_ear_width = get_ear_width(device_width);
 
 function get_bore_depth(device_bore_margin_horizontal,device_bore_columns) =
     (device_bore_columns - 1) * device_bore_margin_horizontal
@@ -92,7 +79,7 @@ device_screw_alignment = [strength,depth/2,device_screw_alignment_vertical];
 module base_ear(width,strength,height) {
     union() {
         // Front face
-        cuboid([rack_ear_width,strength,height],anchor=LEFT+BOTTOM+FRONT,chamfer=CHAMFER);
+        cuboid([width,strength,height],anchor=LEFT+BOTTOM+FRONT,chamfer=CHAMFER);
         // Side face
         cuboid([strength,depth,height],anchor=LEFT+BOTTOM+FRONT,chamfer=CHAMFER);
     }
@@ -110,10 +97,18 @@ module screws_countersunk(length, diameter_head, length_head, diameter_shaft) {
 
 
 // Assemble the rackmount ear
+module rackmount_ear(asym=0){
+    ear_width_19_inch=(RACK_WIDTH_19_INCH - device_width) / 2 + asym;
+    ear_width_10_inch=(RACK_WIDTH_10_INCH_OUTER - device_width) / 2 + asym;
+    // Calculate the width of the ear
+    rack_ear_width = device_width > RACK_WIDTH_10_INCH_INNER || autosize == false && rack_size == 19 ?
+            ear_width_19_inch:
+            ear_width_10_inch
+    ;
     difference() {
         difference() {
             // Create the base of the ear
-        base_ear(device_width,strength,RACK_HEIGHT);
+            base_ear(rack_ear_width,strength,RACK_HEIGHT);
             // Create the holes for the device screws
             screws_countersunk(length=strength,diameter_head=device_bore_hole_head_diameter,length_head=device_bore_hole_head_length,diameter_shaft=device_bore_hole_diameter);
         }
@@ -122,3 +117,13 @@ difference() {
         zcopies(spacing=RACK_BORE_DISTANCE_VERTICAL,n=3,sp=[rack_ear_width-RACK_BORE_DISTANCE_HORIZONTAL,0,RACK_BORE_DISTANCE_TOP_BOTTOM])
         cuboid([RACK_BORE_WIDTH,strength+1,CAGE_BOLT_DIAMETER], rounding=CAGE_BOLT_DIAMETER/2, edges=[TOP+LEFT,TOP+RIGHT,BOTTOM+LEFT,BOTTOM+RIGHT], anchor=FRONT);
     }
+}
+
+// Place the ears
+rackmount_ear(asymetry);
+
+x_mirror_plane = [1,0,0];
+translate([-device_width,0,0])
+mirror(x_mirror_plane){
+    rackmount_ear(-asymetry);
+}