add capsule holder for testing microphones, includes slots for spring contacts

TestRig.scad

@@ -0,0 +1,109 @@
+//
+// Test Rig for Primo EM182 capsules
+//
+// Copyright 2015, Fernando Lopez-Lezcano, All Rights Reserved
+// nando@ccrma.stanford.edu
+//
+//
+//  This program is free software: you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License as published by
+//  the Free Software Foundation, either version 3 of the License, or
+//  (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+//
+// 3d Models released under the Creative Commons license as follows:
+//   Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
+// http://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// dimensions of the EM182 electret microphone
+capsule_radius = 5;
+capsule_height = 4.5;
+
+// wall thickness of capsule holder
+wall = 1;
+
+// contact pads
+pad_offset = 3.56;
+
+// slot for contact
+contact_width = 0.85;
+
+// length of contact
+contact_length = 2.9;
+
+// depth of contact channel (includes contact)
+contact_depth = 0.79;
+
+// support depth
+disk_depth = 1.17;
+disk_edge = 0.49;
+
+// adjustment for the inner radius of the capsule holder
+//   measured inside diameter of a trial print was around 7.5 to 8.2 
+//   instead of 10, capsule diameter was 9.99)
+fudge = 0.15;
+
+// number of facets for rendering cylinders
+facets = 64;
+
+
+// main capsule holder
+*translate([capsule_radius * 3.0, 0, 0]) {
+    difference() {
+        cylinder(r = capsule_radius + wall, h = capsule_height, $fn = facets);
+        cylinder(r = capsule_radius + fudge, h = capsule_height, $fn = facets);
+    }
+}
+
+// plate for contact springs
+difference() {
+    union() {
+        difference() {
+            union() {
+                cylinder(r = capsule_radius + wall, h = disk_edge, $fn = facets);
+                cylinder(r = capsule_radius, h = disk_depth, $fn = facets);
+            }
+            difference() {
+                cylinder(r = capsule_radius, h = disk_depth, $fn = facets);
+                cylinder(r = capsule_radius - 2, h = disk_depth, $fn = facets);
+            }
+        }
+        translate([-capsule_radius / 2 + 4 * fudge, 0, 0]) {
+            cube([capsule_radius, capsule_radius, disk_depth]);
+        }
+        rotate([0, 0, 90]) {
+            translate([-capsule_radius / 4, 0, 0]) {
+                cube([contact_width + fudge, capsule_radius, 1.0]);
+            }
+        }
+    }
+    union() {
+        // vertical slots for contacts
+        for(slot = [2/3, -2/3]) {
+            translate([slot * capsule_radius / 3, capsule_radius - pad_offset + contact_length, 0]) {
+                cube([contact_width + fudge, capsule_radius, 1.0]);
+            }
+            translate([slot * capsule_radius / 3, capsule_radius - pad_offset, contact_depth]) {
+                cube([contact_width + fudge, capsule_radius, 1.0]);
+            }
+        }
+        // horizontal slot for GND contact
+        rotate([0, 0, 90]) {
+            translate([-capsule_radius / 3, capsule_radius - pad_offset + contact_length, 0]) {
+                cube([contact_width + fudge, capsule_radius, 1.0]);
+            }
+            translate([-capsule_radius / 3, capsule_radius - pad_offset, contact_depth]) {
+                cube([contact_width + fudge, capsule_radius, 1.0]);
+            }
+        }
+    }
+}
+