NopSCADlib/vitamins/geared_stepper.scad

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//
// NopSCADlib Copyright Chris Palmer 2019
// 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/>.
//
//
//! Geared tin can steppers
//
include <../utils/core/core.scad>
use <../utils/rounded_cylinder.scad>
use <../utils/round.scad>
function gs_diameter(type) = type[2]; //! Can diameter
function gs_height(type) = type[3]; //! Can height
function gs_pitch(type) = type[4]; //! Screw pitch
function gs_lug_w(type) = type[5]; //! Screw lug width
function gs_lug_t(type) = type[6]; //! Screw lug thickness
function gs_hole_d(type) = type[7]; //! Screw hole diameter
function gs_offset(type) = type[8]; //! Offset of the shaft from the centre of the can
function gs_boss_d(type) = type[9]; //! Boss around the shaft diameter
function gs_boss_h(type) = type[10]; //! Boss around the shaft height
function gs_shaft_d(type) = type[11]; //! Shaft diameter
function gs_shaft_flat(type) = type[12]; //! Shaft width across the flats
function gs_shaft_length(type) = type[13]; //! Shaft length
function gs_flat_length(type) = type[14]; //! Shaft flat length
function gs_bulge_w(type) = type[15]; //! Plastic bulge width
function gs_bulge_d(type) = type[16]; //! Plastic bulge depth from centre
function gs_bulge_h(type) = type[17]; //! Plastic bulge height
function gs_bulge2_w(type) = type[18]; //! Plastic rear bulge width
function gs_bulge2_d(type) = type[19]; //! Plastic rear bulge depth from centre
function gs_bulge2_h(type) = type[20]; //! Plastic rear bulge height
module geared_stepper_screw_positions(type) //! Place children at the screw positions
for(side = [-1, 1])
translate([side * gs_pitch(type) / 2, -gs_offset(type)])
children();
module geared_stepper(type) { //! Draw the specified geared stepper
vitamin(str("geared_stepper(", type[0], "): Geared stepper - ", type[1]));
radius = gs_diameter(type) / 2;
height = gs_height(type);
offset = gs_offset(type);
color("silver") {
translate([0, -offset])
rounded_cylinder(r = radius, h = height, r2 = 1);
cylinder(d = gs_boss_d(type), h = 2 * gs_boss_h(type), center = true);
linear_extrude(gs_lug_t(type))
difference() {
hull()
geared_stepper_screw_positions(type)
circle(d = gs_lug_w(type));
geared_stepper_screw_positions(type)
circle(d = gs_hole_d(type));
}
translate([0, -offset - radius, eps])
cube([gs_bulge_w(type) - 2, 2 * (gs_bulge_d(type) - radius) - 2, 2 * eps], center = true);
}
vflip()
color(brass) {
d = gs_shaft_d(type);
h = gs_shaft_length(type);
linear_extrude(h)
intersection() {
circle(d = d);
square([d + 1, gs_shaft_flat(type)], center = true);
}
cylinder(d = d, h = h - gs_flat_length(type));
}
color("skyblue") {
h1 = gs_bulge_h(type);
translate([0, - offset - radius, eps])
rounded_rectangle([gs_bulge_w(type), 2 * (gs_bulge_d(type) - radius), h1], 0.5, center = false);
h2 = gs_bulge2_h(type);
translate([0, - offset, h1 + 1 - h2])
linear_extrude(h2)
round(0.5)
intersection() {
circle(gs_bulge2_d(type));
translate([0, -50])
square([gs_bulge2_w(type), 100], center = true);
}
}
translate_z(2.5)
for(i = [0 : 4])
translate([i - 2.5, 0])
rotate([90, 0, 0])
color(["yellow", "orange", "red", "pink", "blue"][i])
cylinder(d = 1, h = radius + offset + 10);
}