NopSCADlib/vitamins/rail.scad

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7.9 KiB
OpenSCAD

//
// 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/>.
//
//! Linear rails with carriages.
//
include <../utils/core/core.scad>
use <screw.scad>
function rail_width(type) = type[1]; //! Width of rail section
function rail_height(type) = type[2]; //! Height of rail section
function rail_end(type) = type[3]; //! Minimum distance screw can be from the end
function rail_pitch(type) = type[4]; //! Distance between screws
function rail_bore(type) = type[5]; //! Counter bore diameter for screw head
function rail_hole(type) = type[6]; //! Screw hole diameter
function rail_bore_depth(type) = type[7]; //! Counter bore depth
function rail_screw(type) = type[8]; //! Screw type
function rail_carriage(type) = type[9]; //! Carriage type
function rail_end_screw(type) = type[10]; //! Screw used for ends only (Countersink used for better location)
function rail_screw_height(type, screw) = rail_height(type) - rail_bore_depth(type) + screw_head_depth(screw, rail_hole(type)); //! Position screw taking into account countersink into counterbored hole
function rail_travel(type, length) = length - carriage_length(rail_carriage(type)); //! How far the carriage can travel
function carriage_length(type) = type[0]; //! Overall length
function carriage_block_length(type) = type[1]; //! Length of the metal part
function carriage_width(type) = type[2]; //! Width of carriage
function carriage_height(type) = type[3]; //! Height of carriage
function carriage_clearance(type) = type[4]; //! Gap under the carriage
function carriage_pitch_x(type) = type[5]; //! Screw hole x pitch
function carriage_pitch_y(type) = type[6]; //! Screw hole y pitch
function carriage_screw(type) = type[7]; //! Carriage screw type
function carriage_screw_depth(type) = 2 * screw_radius(carriage_screw(type)); //! Carriage thread depth
module rail_hole_positions(type, length, first = 0, screws = 100, both_ends = true) { //! Position children over screw holes
pitch = rail_pitch(type);
holes = floor((length - 2 * rail_end(type)) / pitch) + 1;
for(i = [first : holes - 1 - first])
if(i < screws || (holes - i <= screws && both_ends))
translate([i * pitch - length / 2 + (length - (holes -1) * pitch) / 2, 0, 0])
children();
}
module carriage_hole_positions(type) { //! Position children over screw holes
x_pitch = carriage_pitch_x(type);
y_pitch = carriage_pitch_y(type);
for(x = [-1, 1], y = [-1, 1])
if(x < 0 || x_pitch)
translate([x * x_pitch / 2, y * y_pitch / 2, carriage_height(type)])
children();
}
module carriage(type, rail, end_colour = grey(20), wiper_colour = grey(20)) { //! Draw the specified carriage
total_l = carriage_length(type);
block_l = carriage_block_length(type);
block_w = carriage_width(type);
block_h = carriage_height(type) - carriage_clearance(type);
end_w = block_w - 0.6;
end_h = block_h - 0.3;
end_l = (total_l - block_l)/ 2;
screw = carriage_screw(type);
screw_depth = carriage_screw_depth(type);
module cutout() {
w = rail_width(rail) + 0.4;
translate([-w / 2, 0])
square([w , rail_height(rail) + 0.2]);
}
color(grey(90)) {
rotate([90, 0, 90])
linear_extrude(block_l, center = true)
difference() {
translate([-block_w / 2, carriage_clearance(type)])
square([block_w, block_h - screw_depth]);
cutout();
}
translate_z(carriage_height(type) - screw_depth)
linear_extrude(screw_depth)
difference() {
square([block_l, block_w], center = true);
carriage_hole_positions(type)
circle(screw_pilot_hole(screw));
}
}
module carriage_end(type, end_w, end_h, end_l) {
wiper_length = 0.5;
color(wiper_colour) translate_z(-end_l/2) linear_extrude(wiper_length)
difference() {
translate([-end_w/2, carriage_clearance(type)])
square([end_w, end_h]);
cutout();
}
color(end_colour) translate_z(wiper_length-end_l/2) linear_extrude(end_l-wiper_length)
difference() {
translate([-end_w/2, carriage_clearance(type)])
square([end_w, end_h]);
cutout();
}
}
translate([-(block_l+end_l)/2,0,0])
rotate([90, 0, 90])
carriage_end(type, end_w, end_h, end_l);
translate([(block_l+end_l)/2,0,0])
rotate([90, 0, -90])
carriage_end(type, end_w, end_h, end_l);
}
module rail(type, length) { //! Draw the specified rail
width = rail_width(type);
height = rail_height(type);
vitamin(str("rail(", type[0], ", ", length, "): Linear rail ", type[0], " x ", length, "mm"));
color(grey(90)) {
linear_extrude(height - rail_bore_depth(type)) difference() {
square([length, width], center = true);
rail_hole_positions(type, length)
circle(d = rail_hole(type));
}
translate_z(rail_height(type) - rail_bore_depth(type)) {
h1 = rail_bore_depth(type) > 2 ? rail_bore_depth(type) / 3 : rail_bore_depth(type) / 2;
h0 = rail_bore_depth(type) > 2 ? (rail_bore_depth(type) - h1) / 2 : 0;
h2 = rail_bore_depth(type) - h1 - h0;
linear_extrude(h0) difference() {
square([length, width], center = true);
rail_hole_positions(type, length)
circle(d = rail_bore(type));
}
translate_z(h0)
linear_extrude(h1) difference() {
w1 = max(width - 2, rail_bore(type));
square([length, w1], center = true);
rail_hole_positions(type, length)
circle(d = rail_bore(type));
}
translate_z(h0 + h1)
linear_extrude(h2) difference() {
square([length, width], center = true);
rail_hole_positions(type, length)
circle(d = rail_bore(type));
}
}
}
}
module rail_assembly(type, length, pos, carriage_end_colour = grey(20), carriage_wiper_colour = grey(20)) { //! Rail and carriage assembly
rail(type, length);
translate([pos, 0])
carriage(rail_carriage(type), type, carriage_end_colour, carriage_wiper_colour);
}
module rail_screws(type, length, thickness, screws = 100) { //! Place screws in the rail
screw = rail_screw(type);
end_screw = rail_end_screw(type);
screw_len = screw_longer_than(rail_screw_height(type, screw) + thickness);
end_screw_len = screw_longer_than(rail_screw_height(type, end_screw) + thickness);
index_screws = screws > 2 ? 1 : 2;
translate_z(rail_screw_height(type, end_screw))
rail_hole_positions(type, length, 0, index_screws)
screw(end_screw, end_screw_len);
translate_z(rail_screw_height(type, screw))
rail_hole_positions(type, length, index_screws, screws)
screw(screw, screw_len);
}