SpHEAR/SpHEAR_windscreen.scad

//
// Spherical Harmonics Ear Project (*SpHEAR)
//
// Windscreen modules
// 
// Copyright 2017, 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/

// http://dkprojects.net/openscad-threads/
// used for the windscreeen mount threads
include <threads.scad>;

////
//// default model parameters
////

// windscreen frame

module sphear_windscreen_frame(sides, radius, height, beam_radius, twist, heights) {
    inc = 360/sides;
    for (r = [0:inc:360]) for (t = [1, -1]) rotate([0, 0, r]) {
        render() {
            linear_extrude(height = height, center = false, convexity = 0, twist = twist * t, $fn = facets/2) {
                translate([radius, 0, 0]) {
                    circle(r = beam_radius, $fn = facets/2);
                }
            }
            *if (t == -1) for (h = [1/3, 2/3, 1]) {
                rotate([0, 0, (inc/2) * (t - 1)]) translate([radius, 0, h * height]) {
                    intersection() {
                        scale([1.0, 1.55, 1.0]) {
                            translate([0, 0, -beam_radius * 2]) {
                                cylinder(r = beam_radius, h = beam_radius * 4, $fn = facets);
                            }
                        }
                        scale([1, 2, 2.5]) sphere(r = beam_radius, $fn = facets);
                    }
                }
            }
        }
    }
}

// windscreen inset frame

module sphear_windscreen_inset_frame(sides, radius, iradius, height, beam_radius, xscale = 1.0, yscale = 1.0) {
    inc = 360/sides;
    difference() {
        for (r = [0:inc:360]) for (t = [1, -1]) rotate([0, 0, r]) {
            render() {
                hull() {
                    translate([iradius, 0, 0]) {
                        scale([xscale, yscale, 1.0]) cylinder(r = beam_radius, h = thin_mint, $fn = facets);
                    }
                    rotate([0, 0, inc/2 * t]) translate([radius, 0, height]) {
                        cylinder(r = beam_radius, h = thin_mint, $fn = facets);
                    }
                }
            }
        }
        cylinder(r = iradius, h = height, $fn = facets);
    }
}

// windscreen frame reinforcements

module sphear_windscreen_frame_reinforcements(sides, radius, beam_radius, zrotation, yrotation) {
    for (r = [0:360/sides:360]) rotate([0, 0, r + zrotation]) {
        translate([radius, 0, 0]) {
            render() rotate([0, yrotation, 0]) intersection() {
                scale([1.0, 1.55, 1.0]) {
                    translate([0, 0, -beam_radius * 2]) {
                        cylinder(r = beam_radius, h = beam_radius * 4, $fn = facets);
                    }
                }
                scale([1, 2, 2.5]) sphere(r = beam_radius, $fn = facets);
            }
        }
    }
}

// windscreen dome

module sphear_windscreen_dome(sides, radius, beam_radius) {
    arcs = sides/2 - 1;
    ang = 360 / sides;
    difference() {
        for (r = [0, 90]) rotate([0, 0, r]) {
            for (t = [1, -1]) {
                translate([radius * sin(ang/2) * t, 0, 0]) rotate([0, 90, 0]) {
                    render() rotate_extrude(convexity = 10, $fn = facets) {
                        translate([radius * cos(ang/2), 0, 0]) {
                            circle(r = beam_radius, $fn = facets);
                        }
                    }
                }
                translate([radius * sin(ang/(2/3)) * t, 0, 0]) rotate([0, 90, 0]) {
                    render() rotate_extrude(convexity = 10, $fn = facets) {
                        translate([radius * cos(ang/(2/3)), 0, 0]) {
                            circle(r = beam_radius, $fn = facets);
                        }
                    }
                }
            }
        }
        brad = radius + 2 * beam_radius + thin_mint;
        translate([-brad, -brad, - 2 * brad]) {
            cube([2 * brad, 2 * brad, 2 * brad]);
        }
    }
}

// windscreen mount to body with thread

module sphear_windscreen_mount(height, radius, beam_radius) {
    octagon_radius = (radius + 2 * beam_radius + wall) * cos(PI/8);
    difference() {
        cylinder(r = radius + 2 * beam_radius + windscreen_thread_depth, h = height, $fn = facets);
        metric_thread(diameter = radius * 2 + windscreen_thread_fit, pitch = windscreen_thread_pitch,
                length = height, angle = windscreen_thread_angle, internal = true);
        // make outside be a octagon instead of a circle
        rotate([0, 0, 22.5]) translate([0, 0, -thin_mint]) {
            difference() {
                cylinder(r = 1.5 * radius, h = height + 2 * thin_mint);
                cylinder(r = octagon_radius, h = height + 2 * thin_mint, $fn = 8);
            }
        }
    }
    // marker for center of screen
    translate([-(radius + wall), 0, 0]) {
        cylinder(r = 1.0, h = height, $fn = facets);
    }
}

// round windscreen mount to body with thread

module sphear_windscreen_round_mount(height, radius, wall) {
    difference() {
        cylinder(r = radius + wall, h = height, $fn = facets);
        metric_thread(diameter = radius * 2 + windscreen_thread_fit, pitch = windscreen_thread_pitch,
                length = height, angle = windscreen_thread_angle, internal = true);
    }
    // add better attachment points for windscreen
    difference() {
        union() {
            cylinder(r = radius + 2 * wall, h = height/2, $fn = facets);
            translate([0, 0, height/2]) {
                cylinder(r1 = radius + 2 * wall, r2 = radius + wall, h = height/2, $fn = facets);
            }
        }
        cylinder(r = radius + wall, h = height, $fn = facets);
    }
    // marker for center of microphone
    translate([-(radius + 2 * wall), 0, 0]) {
        cylinder(r = 1.0, h = height/2, $fn = facets);
    }
}