# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1412629739 -7200
# Node ID 88a49e3cbeb9d9fd9543a228d982afae34e82fe9
# Parent  206e88f570e24389759a87832d77bbed515972e8
Introduced internal front and back depth measurements.

diff -r 206e88f570e2 -r 88a49e3cbeb9 cartridge.scad
--- a/cartridge.scad	Mon Oct 06 22:08:06 2014 +0200
+++ b/cartridge.scad	Mon Oct 06 23:08:59 2014 +0200
@@ -85,16 +85,18 @@
 
 	groove_width_extra = 2.0;
 
-	/* Division of pieces into front and back. */
+	/* Division of pieces into front and back, defining the extents. */
 
-	front_depth = 6.5;
+	int_front_depth = 4.5;
+	front_depth = int_front_depth + front;
+	int_back_depth = int_depth - int_front_depth + groove_width_extra;
+	back_depth = int_back_depth + back;
 
 	/* Cartridge dimensions. */
 
 	width = int_width + side + side;
 	height = int_payload_height + int_connector_height + top;
 	depth = int_depth + front + back;
-	back_depth = depth - front_depth + groove_width_extra;
 
 	/* Cartridge surfaces. */
 
@@ -157,7 +159,9 @@
 	back_cavity_inner_height = 12.0;
 	back_cavity_depth = 1.5;
 
-	/* The effect of the cavity on the inside of the case. */
+	/*
+	The effect of the cavity on the inside of the case.
+	*/
 
 	inner_back_cavity_offset = 1.0;
 	inner_back_cavity_offset_from_left = back_left;
@@ -175,9 +179,20 @@
 	inner_front_edge_height = 3.0;
 	inner_front_edge_depth = 1.5;
 
+	/*
+	The cutouts in the floor of the front of the cartridge that produce a
+	kind of tab that guides the edge connector into place in the back cutout.
+	*/
+
 	edge_connector_cutout_front_offset = 1.0;
 	edge_connector_cutout_front_depth = 1.0;
 	edge_connector_cutout_front_width = 15.0;
+
+	/*
+	The cutout in the floor of the back of the cartridge that accommodates
+	the edge connector.
+	*/
+
 	edge_connector_cutout_back_depth = 3.0;
 	edge_connector_cutout_back_width = 57.5;
 
@@ -312,7 +327,7 @@
 	module pcb_front_lug(xdir) {
 		translate([xdir *
 			(width/2 - pcb_lug_offset_from_outside),
-			-front_depth + front + pcb_front_lug_depth,
+			-int_front_depth + pcb_front_lug_depth,
 			-height / 2 + bottom + int_connector_height +
 				pcb_lug_offset_from_bottom
 			])