# HG changeset patch
# User Paul Boddie <paul@boddie.org.uk>
# Date 1393096576 -3600
# Node ID e3b0d233b80d10e235b7395a711bff9f5b5a8318
# Parent  785e92ee4c9629cf277f843559fe46b7fcbe929f
Added PCB "lug" definitions and made module definitions for supports and lugs.

diff -r 785e92ee4c96 -r e3b0d233b80d cartridge.scad
--- a/cartridge.scad	Sat Feb 22 16:06:57 2014 +0100
+++ b/cartridge.scad	Sat Feb 22 20:16:16 2014 +0100
@@ -178,6 +178,69 @@
 	/* Move the PCB support towards the centre. */
 	pcb_support_margin = 0.55;
 
+	pcb_lug_depth = pcb_back_support_depth +
+		pcb_back_support_bump_depth;
+	pcb_lug_inner_radius = 1.0;
+	pcb_lug_outer_radius = 5.5 / 2;
+	pcb_lug_offset_from_bottom = 14.35;
+	pcb_lug_offset_from_outside = 7.55;
+
+	pcb_lug_cross_width = 6.7;
+	pcb_lug_cross_depth = pcb_lug_depth;
+	pcb_lug_cross_height = 1.4;
+
+	/* Repeated constructs. */
+
+	module pcb_support(xdir) {
+		translate([xdir *
+			(edge_connector_cutout_back_width / 2 - pcb_support_margin),
+			edge_connector_cutout_back_depth,
+			-height / 2 + bottom + bottom_from_base])
+			justify(pcb_back_support_width,
+				pcb_back_support_depth,
+				pcb_back_support_height,
+				xdir, 1, 1)
+				union() {
+					cube([pcb_back_support_width,
+						pcb_back_support_depth,
+						pcb_back_support_height], center = true);
+					cube_at(pcb_back_support_bump_width,
+						pcb_back_support_bump_depth,
+						pcb_back_support_left_bump_height,
+						0, -1, 1,
+						0,
+						-pcb_back_support_depth / 2,
+						-pcb_back_support_height / 2 +
+							pcb_back_support_left_bump_offset_from_bottom);
+				}
+	}
+
+	module pcb_lug(xdir) {
+		translate([xdir *
+			(width/2 - pcb_lug_offset_from_outside),
+			back_depth,
+			-height / 2 + bottom + bottom_from_base +
+				pcb_lug_offset_from_bottom
+			])
+			rotate([90, 0, 0])
+				difference() {
+					union() {
+						cylinder(h=pcb_lug_depth, r=pcb_lug_outer_radius);
+						cube_at(pcb_lug_cross_width,
+							pcb_lug_cross_height, pcb_lug_cross_depth,
+							0, 0, 1,
+							0, 0, 0);
+						cube_at(pcb_lug_cross_height,
+							pcb_lug_cross_width, pcb_lug_cross_depth,
+							0, 0, 1,
+							0, 0, 0);
+					}
+					cylinder(h=pcb_lug_depth, r=pcb_lug_inner_radius);
+				}
+	}
+
+	/* The actual shapes. */
+
 	translate([-width * 0.6, 0, 0])
 	difference() {
 
@@ -356,49 +419,13 @@
 
 			/* PCB supports. */
 
-			translate([-edge_connector_cutout_back_width / 2 +
-				pcb_support_margin,
-				edge_connector_cutout_back_depth,
-				-height / 2 + bottom + bottom_from_base])
-				justify(pcb_back_support_width,
-					pcb_back_support_depth,
-					pcb_back_support_height,
-					1, 1, 1)
-					union() {
-						cube([pcb_back_support_width,
-							pcb_back_support_depth,
-							pcb_back_support_height], center = true);
-						cube_at(pcb_back_support_bump_width,
-							pcb_back_support_bump_depth,
-							pcb_back_support_left_bump_height,
-							0, -1, 1,
-							0,
-							-pcb_back_support_depth / 2,
-							-pcb_back_support_height / 2 +
-								pcb_back_support_left_bump_offset_from_bottom);
-					}
+			pcb_support(-1);
+			pcb_support(1);
 
-			translate([edge_connector_cutout_back_width / 2 -
-				pcb_support_margin,
-				edge_connector_cutout_back_depth,
-				-height / 2 + bottom + bottom_from_base])
-				justify(pcb_back_support_width,
-					pcb_back_support_depth,
-					pcb_back_support_height,
-					-1, 1, 1)
-					union() {
-						cube([pcb_back_support_width,
-							pcb_back_support_depth,
-							pcb_back_support_height], center = true);
-						cube_at(pcb_back_support_bump_width,
-							pcb_back_support_bump_depth,
-							pcb_back_support_right_bump_height,
-							0, -1, 1,
-							0,
-							-pcb_back_support_depth / 2,
-							-pcb_back_support_height / 2 +
-								pcb_back_support_right_bump_offset_from_bottom);
-					}
+			/* Circular "lugs" to hold PCBs in place. */
+
+			pcb_lug(-1);
+			pcb_lug(1);
 		}
 
 		/* Label insets. */