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@@ -6,7 +6,7 @@
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// by Eric Benjamin, Audio Engineering Society Convention Paper 8728,
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// October 2012, San Francisco
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-// Copyright 2015, Fernando Lopez-Lezcano, All Rights Reserved
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+// Copyright 2015-2016, Fernando Lopez-Lezcano, All Rights Reserved
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// nando@ccrma.stanford.edu
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//
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//
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@@ -32,7 +32,7 @@
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////
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//// model parameters
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-// dimensions of the EM182 electret microphone
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+// dimensions of the electret microphone capsule
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capsule_radius = 5;
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capsule_height = 4.5;
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@@ -69,13 +69,13 @@ tetra_compat = 0;
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// 0 -> ready to print
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// set = 0 -> one capsule, set = 1 -> four capsules
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// 1 -> the whole microhone with eight capsules
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-rendermic = 0;
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-renderset = 1;
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+rendermic = 1;
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+renderset = 0;
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// what type of connection to use between capsule holders:
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-// 0 -> original cylinder beams
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-// 1 -> interlocking beams (out)
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-// 2 -> interlocking beams (in)
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+// 0 -> original cylindrical angled legs
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+// 1 -> interlocking horizontal legs
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+// 2 -> interlocking vertical legs
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connect = 1;
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// adjustment for the radius of the capsule
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@@ -84,7 +84,7 @@ connect = 1;
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fudge = 0.15;
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// adjustment for fit of slots in connection legs and mount
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-fit = 0.2;
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+fit = 0.1;
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// number of facets for rendering cylinders
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facets = 64;
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@@ -150,88 +150,90 @@ mount_slot_depth = ridge_length * sin(elev_angle);
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// mounts: vectors containing the angle of the mount and the angle to the adjacent capsule
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// twist: rotate the whole capsule to match mounting legs
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-module capsule (azimuth, elevation, mounts, twist, ridge) {
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- rotate([0, 0, azimuth]) {
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- rotate([0, (90 - elevation), 0]) {
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- translate([0, 0, rendermic == 0 ? 0 : mic_radius - capsule_height]) {
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- difference () {
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- union () {
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- // main capsule holder
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- cylinder(r = capsule_radius + wall, h = capsule_height, $fn = facets);
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- // the mounting legs
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- for (angles = mounts) {
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- rotate([0, 0, angles[0] + twist]) {
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- // connect with cylindrical beams, very pretty
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+module capsule (azimuth, elevation, mounts, twist, ridge, ridge_fit = 0.0, solid = 0) {
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+ rotate([0, 0, azimuth]) {
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+ rotate([0, (90 - elevation), 0]) {
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+ translate([0, 0, (rendermic == 0 && solid == 0) ? 0 : mic_radius - capsule_height]) {
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+ difference () {
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+ union () {
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+ // main capsule holder
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+ cylinder(r = capsule_radius + wall, h = capsule_height, $fn = facets);
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+ // the mounting legs
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+ for (angles = mounts) {
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+ rotate([0, 0, angles[0] + twist]) {
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+ // connect with cylindrical beams, very pretty
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leg_length = mic_radius * sin(angles[1]) - (capsule_radius + wall) * cos(angles[1]) + wall;
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- if (connect == 0) {
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- translate([capsule_radius - wall, 0, capsule_height - wall]) {
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- rotate([0, 180 - (90 - angles[1]), 0]) {
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- cylinder(d = leg_width, h = leg_length - 0.1, center = false, $fn = facets);
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- }
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- }
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- }
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- // connect with horizontal legs
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- if (connect == 1) {
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+ if (connect == 0) {
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+ translate([capsule_radius - wall, 0, capsule_height - wall]) {
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+ rotate([0, 180 - (90 - angles[1]), 0]) {
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+ cylinder(d = leg_width, h = leg_length - 0.1, center = false, $fn = facets);
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+ }
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+ }
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+ }
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+ // connect with horizontal legs
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+ if (connect == 1) {
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leg_length = (mic_radius - capsule_height + leg_thick) * tan(angles[1]) - capsule_radius;
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slot_depth = leg_thick * cos(90 - 2 * angles[1]) + fit;
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- translate([capsule_radius + leg_length + fudge, - leg_width / 3, 0]) {
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- rotate([0, -90, 0]) {
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- difference() {
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- // thickness, width
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- cube([leg_thick, leg_width, leg_length]);
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- // cut slot in connector
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- translate([0, leg_width / 3 - (fit / 2), 0]) {
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- cube([leg_thick, leg_width / 3 + fit, slot_depth]);
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- }
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- }
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- }
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- }
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- }
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- // connect with vertical legs
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- if (connect == 2) {
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+ translate([capsule_radius + leg_length + fudge, - leg_width / 3, 0]) {
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+ rotate([0, -90, 0]) {
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+ difference() {
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+ // thickness, width
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+ cube([leg_thick, leg_width, leg_length]);
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+ // cut slot in connector
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+ translate([0, leg_width / 3 - (fit / 2), 0]) {
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+ cube([leg_thick, leg_width / 3 + fit, slot_depth]);
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+ }
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+ }
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+ }
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+ }
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+ }
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+ // connect with vertical legs
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+ if (connect == 2) {
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leg_length = (mic_radius * tan(angles[1]) - capsule_radius) * tan(90 - angles[1]);
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slot_depth = leg_thick * (cos (90 - 2 * angles[1]) + tan(90 - 2 * angles[1])) + fit;
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- translate([capsule_radius + fudge, - leg_width / 3, - leg_length + capsule_height]) {
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- difference() {
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- // thickness, width
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- cube([leg_thick, leg_width, leg_length]);
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- // cut slot in connector
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- translate([0, leg_width / 3 - (fit / 2), 0]) {
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- cube([leg_thick, leg_width / 3 + fit, slot_depth]);
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- }
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- }
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- }
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- }
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- }
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- }
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- // add ridges for microphone mount
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- if (ridge == 1) {
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- rotate([0, 0, twist]) {
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- translate([capsule_radius + fudge, - wall , 0]) {
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- difference() {
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- cube([ridge_length, ridge_width, capsule_height], center = false);
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- //rotate([0, 90 - elev_angle, 0]) {
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- // cube([ridge_length, ridge_width, capsule_height], center = false);
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- //}
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- }
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- }
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- }
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- }
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- }
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- // make the hole for the capsule
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- translate ([0, 0, -2]) {
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- cylinder(r = capsule_radius + fudge, h = capsule_height + 2, $fn = facets);
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- }
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- // remove any extra connecting beam material from the face of the holder
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- if (connect == 0) {
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- translate ([0, 0, capsule_height]) {
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- cylinder(r = capsule_radius + wall * 2, h = 2, $fn = facets);
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- }
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- }
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- }
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+ translate([capsule_radius + fudge, - leg_width / 3, - leg_length + capsule_height]) {
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+ difference() {
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+ // thickness, width
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+ cube([leg_thick, leg_width, leg_length]);
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+ // cut slot in connector
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+ translate([0, leg_width / 3 - (fit / 2), 0]) {
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+ cube([leg_thick, leg_width / 3 + fit, slot_depth]);
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+ }
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+ }
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+ }
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+ }
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+ }
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+ }
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+ // add ridges for microphone mount
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+ if (ridge == 1) {
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+ rotate([0, 0, twist]) {
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+ translate([capsule_radius + fudge, - wall , 0]) {
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+ difference() {
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+ cube([ridge_length, ridge_width, capsule_height], center = false);
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+ //rotate([0, 90 - elev_angle, 0]) {
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+ // cube([ridge_length, ridge_width, capsule_height], center = false);
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+ //}
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+ }
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+ }
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+ }
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+ }
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+ }
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+ // make the hole for the capsule
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+ if (solid != 1) {
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+ translate ([0, 0, -2]) {
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+ cylinder(r = capsule_radius + fudge, h = capsule_height + 2, $fn = facets);
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}
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- }
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- }
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+ }
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+ // remove any extra connecting beam material from the face of the holder
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+ if (connect == 0) {
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+ translate ([0, 0, capsule_height]) {
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+ cylinder(r = capsule_radius + wall * 2, h = 2, $fn = facets);
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+ }
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+ }
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+ }
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+ }
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+ }
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+ }
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}
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// microphone mount
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@@ -241,45 +243,45 @@ module capsule (azimuth, elevation, mounts, twist, ridge) {
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// separation: height of mount with respect of the microphone assembly
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module mount (angles, wall, separation) {
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- translate([0, 0, -(separation + 0.1)]) {
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- difference() {
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- union() {
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- // grips for the capsule holder ridge
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- for (rot = angles) {
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- rotate([0, 0, rot]) {
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- translate([-capsule_sep_max, -(ridge_width - fit / 2), -mount_height]) {
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- cube([capsule_sep_max, ridge_width * 2 - fit, mount_height]);
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+ translate([0, 0, -(separation + 0.1)]) {
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+ difference() {
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+ union() {
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+ // grips for the capsule holder ridge
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+ for (rot = angles) {
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+ rotate([0, 0, rot]) {
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+ translate([-capsule_sep_max, -(ridge_width - fit / 2), -mount_height]) {
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+ cube([capsule_sep_max, ridge_width * 2 - fit, mount_height]);
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rotate([0, -elev_angle, 0]) {
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cube([capsule_sep_max, ridge_width * 2 - fit, mount_height * cos(elev_angle)]);
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}
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- }
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- }
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- }
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- translate([0, 0, -mount_height]) {
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- cylinder(r = mount_radius + wall, h = mount_height, $fn = facets);
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- }
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- }
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- // make the hole for the mount (* 2 to cut the ridge as well)
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- translate([0, 0, -mount_height]) {
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- cylinder(r = mount_radius, h = mount_height * 2, $fn = facets);
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- }
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+ }
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+ }
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+ }
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+ translate([0, 0, -mount_height]) {
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+ cylinder(r = mount_radius + wall, h = mount_height, $fn = facets);
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+ }
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+ }
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+ // make the hole for the mount (* 2 to cut the ridge as well)
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+ translate([0, 0, -mount_height]) {
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+ cylinder(r = mount_radius, h = mount_height * 2, $fn = facets);
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+ }
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// cut the outside of the sloped ridge
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- translate([0, 0, -mount_height]) {
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+ translate([0, 0, -mount_height]) {
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difference() {
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cylinder(r = capsule_sep_max + mount_height * 2, h = mount_height * 2, $fn = facets);
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cylinder(r = capsule_sep_max, h = mount_height * 2, $fn = facets);
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}
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- }
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- // and cut a slot for the ridges in the wall of the cylinder
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+ }
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+ // and cut a slot for the ridges in the wall of the cylinder
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for (rot = angles) {
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rotate([0, 0, rot]) {
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translate([-capsule_sep_max * 2, -ridge_width + 4 * fit, -mount_slot_depth]) {
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cube([capsule_sep_max * 2, ridge_width + 2 * fit, mount_height * 2]);
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}
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}
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- }
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- }
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- }
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+ }
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+ }
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+ }
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}
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// render a complete microphone
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@@ -289,7 +291,7 @@ if (rendermic == 1) {
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capsule(az + 45, -elev_angle, leg_angles, 0, 1);
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}
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// the mount
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- mount([0, 90, -90, 180], 1, capsule_bottom);
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+ mount([0, 90, -90, 180], 1, capsule_bottom);
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}
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// print all the parts separately
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Fernando Pablo Lopez-Lezcano