NopSCADlib/vitamins/leadnut.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/>.
//
//
//! Nuts for leadscrews.
//
include <../core.scad>
use <../utils/tube.scad>
use <../utils/thread.scad>
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function leadnut_bore(type) = type[2]; //! Thread size
function leadnut_od(type) = type[3]; //! Outer diameter of the shank
function leadnut_height(type) = type[4]; //! Total height
function leadnut_flange_dia(type) = type[5]; //! Flange diameter
function leadnut_flange_t(type) = type[6]; //! Flange thickness
function leadnut_flange_offset(type) = type[7]; //! Offset of the flange from the top
function leadnut_holes(type) = type[8]; //! The number of screw holes
function leadnut_hole_dia(type) = type[9]; //! The diameter of the screw holes
function leadnut_hole_pitch(type) = type[10]; //! The radia pitch of the screw holes
function leadnut_screw(type) = type[11]; //! The type of the fixing screws
function leadnut_pitch(type) = type[12]; //! Screw pitch
function leadnut_lead(type) = type[13]; //! Screw lead
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function leadnut_shank(type) = leadnut_height(type) - leadnut_flange_t(type) - leadnut_flange_offset(type); //! The length of the shank below the flange
module leadnut_screw_positions(type) { //! Position children at the screw holes
holes = leadnut_holes(type);
for(i = [0 : holes - 1], a = i * 360 / holes + 180)
rotate(a)
translate([leadnut_hole_pitch(type), 0, leadnut_flange_t(type)])
rotate(45)
children();
}
module leadnut(type) { //! Draw specified leadnut
vitamin(str("leadnut(", type[0], "): ", type[1]));
bore_d = leadnut_bore(type);
bore_r = bore_d / 2;
h = leadnut_height(type);
pitch = leadnut_pitch(type);
lead = leadnut_lead(type);
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color("dimgrey") vflip()
translate_z(-leadnut_flange_offset(type) - leadnut_flange_t(type)) {
tube(or = leadnut_od(type) / 2, ir = bore_r, h = h, center = false);
if(show_threads)
thread(bore_d, lead, h, thread_profile(pitch / 2, pitch * 0.366, 30), false, starts = lead / pitch, female = true, solid = false);
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translate_z(leadnut_flange_offset(type))
linear_extrude(height = leadnut_flange_t(type))
difference() {
circle(d = leadnut_flange_dia(type));
circle(bore_r);
leadnut_screw_positions(type)
circle(d = leadnut_hole_dia(type));
}
}
}