NopSCADlib/vitamins/opengrab.scad

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//
// NopSCADlib Copyright Chris Palmer 2018
// nop.head@gmail.com
// hydraraptor.blogspot.com
//
// This file is part of NopSCADlib.
//
// NopSCADlib 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.
//
// NopSCADlib 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 NopSCADlib.
// If not, see <https://www.gnu.org/licenses/>.
//
//
//! Nicodrone OpenGrab V3 electro-permananet magnet, see <https://nicadrone.com/products/epm-v3>.
//!
//! A permanent magnet that can be magnatized and de-magnatized electronically.
//
include <../utils/core/core.scad>
use <../utils/thread.scad>
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pitch = 33.8;
width = 40;
depth = 18;
magnet = 4.3;
pcb = 0.8;
pillar = 6;
target = 1;
pole_w = 2;
pole_l = 36;
poles = 15;
module opengrab_hole_positions() //! Position children at the screw positions
for(x = [-1, 1], y = [-1, 1])
translate([x * pitch / 2, y * pitch / 2, 0])
children();
function opengrab_width() = width; //! Module width
function opengrab_depth() = depth; //! Module height
function opengrab_target_thickness() = target; //! Target sheet thickness
module opengrab() { //! Draw OpenGrab module
vitamin("opengrab(): OpenGrab V3 electro permanent magnet");
color("grey")
translate_z(magnet / 2 + eps)
cube([width, width, magnet - eps], center = true);
color(grey80) {
gap = (width - poles * pole_w + 3 * eps) / (poles - 1);
pitch = pole_w + gap;
for(i = [0 : poles - 1])
translate([(i - floor(poles / 2)) * pitch - eps, 0, 0.5])
cube([pole_w, pole_l, 1], center = true);
}
color("darkgreen")
translate_z(depth - pillar - pcb / 2)
cube([width, width, pcb], center = true);
translate_z(1)
opengrab_hole_positions() {
color(brass)
linear_extrude(depth - 1)
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difference() {
circle(d = 4.7 / cos(30), $fn = 6);
circle(r = 3/2);
}
if(show_threads)
female_metric_thread(3, metric_coarse_pitch(3), depth - 1, center = false, colour = brass);
}
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}
module opengrab_target() { //! Draw OpenGrab target
vitamin("opengrab_target(): OpenGrab silicon steel target plate");
color(grey80)
linear_extrude(target)
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difference() {
square([width, width], center = true);
opengrab_hole_positions()
circle(d = 3.2);
for(side = [-1, 1])
translate([side * (width / 2 - 3.5), 0])
circle(d = 4);
}
}