NopSCADlib/printed/ribbon_clamp.scad

//
// 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/>.
//

//
//! Clamp for ribbon cable and polypropylene strip or one or more ribbon cables.
//!
//! * When `ways` is a scalar number the slot is sized for one ribbon cable and a PP strip.
//! * When `ways` is a two element vector the second element indicates the number of cables and the slot is size for just the cables.
//
include <../core.scad>
use <../vitamins/insert.scad>
use <../vitamins/cable_strip.scad>

wall = 1.6;
min_wall = 2 * extrusion_width;
screw = M3_cap_screw;

function ribbon_clamp_screw_depth(screw = screw) = insert_length(screw_insert(screw)) + 1;
function ribbon_clamp_hole_pitch(ways, screw = screw) =
    ribbon_clamp_slot(ways) + 2 * min_wall + 2 * corrected_radius(insert_hole_radius(screw_insert(screw))); //! Hole pitch

function ribbon_clamp_width(screw = screw) = 2 * (insert_hole_radius(screw_insert(screw)) + wall); //! Width
function ribbon_clamp_length(ways, screw = screw) = ribbon_clamp_hole_pitch(ways, screw) + ribbon_clamp_width(screw); //! Length given ways
function ribbon_clamp_height(screw = screw, ways = undef) = ribbon_clamp_screw_depth(screw) + 1 +  //! Height
        (!is_undef(ways) && is_list(ways) ?  (ways[1] - 1) * inch(0.05) : 0);

module ribbon_clamp_hole_positions(ways, screw = screw, side = undef) //! Place children at hole positions
    for(x = is_undef(side) ? [-1, 1] : side)
        translate([x * ribbon_clamp_hole_pitch(ways, screw) / 2, 0])
            children();

module ribbon_clamp_holes(ways, h = 20, screw = screw) //! Drill screw holes
    ribbon_clamp_hole_positions(ways, screw)
        drill(screw_clearance_radius(screw), h);

function str_ways(ways) = is_list(ways) ? str(ways[0], "_", ways[1]) : str(ways);
function str_screw_d(screw_d) = screw_d != 3 ? str("_", screw_d) : "";

module ribbon_clamp(ways, screw = screw) { //! Generate STL for given number of ways
    screw_d = screw_radius(screw) * 2;

    pitch = ribbon_clamp_hole_pitch(ways, screw);
    d = ribbon_clamp_width(screw);
    h = ribbon_clamp_height(screw, ways);
    slot_d = is_list(ways) ? ways[1] * inch(0.05) : ribbon_clamp_slot_depth();
    t = round_to_layer(slot_d + wall);
    insert = screw_insert(screw);

    stl(str("ribbon_clamp_", str_ways(ways), str_screw_d(screw_d)))
        difference() {
            union() {
                hull() {
                    translate_z(h - t / 2)
                        cube([ribbon_clamp_hole_pitch(ways, screw), d, t], center = true);

                    translate_z(1)
                        cube([pitch, max(wall, d - 2 * (h - t)), 2], center = true);
                }
                ribbon_clamp_hole_positions(ways, screw, -1)
                    cylinder(d = d, h = h);

                ribbon_clamp_hole_positions(ways, screw, 1)
                    cylinder(d = d, h = h);
            }

            translate_z(h)
                cube([ribbon_clamp_slot(ways), d + 1, slot_d * 2], center = true);

            ribbon_clamp_hole_positions(ways, screw)
                translate_z(h)
                    rotate(22.5)
                        insert_hole(insert, ribbon_clamp_screw_depth(screw) - insert_length(insert));
        }
}

module ribbon_clamp_assembly(ways, screw = screw)  //! Printed part with inserts in place
pose([55, 180, 25])
assembly(let(screw_d = screw_radius(screw) * 2)str("ribbon_clamp_", str_ways(ways), str_screw_d(screw_d)), ngb = true) {
    h = ribbon_clamp_height(screw, ways);
    insert = screw_insert(screw);

    stl_colour(pp1_colour) render()
        translate_z(h) vflip() ribbon_clamp(ways, screw);

    ribbon_clamp_hole_positions(ways, screw)
        vflip()
            insert(insert);
}

module ribbon_clamp_fastened_assembly(ways, thickness, screw = screw) { //! Clamp with fasteners in place
    tape_l = floor(ribbon_clamp_slot(ways));
    tape_width = ribbon_clamp_width(screw) + 2;
    tape_thickness = 0.5;

    vitamin(str(": Tape self amalgamating silicone ",tape_l," x 25mm"));

    screw_length = screw_length(screw, thickness + ribbon_clamp_screw_depth(screw), 2);

    ribbon_clamp_assembly(ways, screw);

    color("red") translate_z(tape_thickness / 2)
        cube([tape_l, tape_width, tape_thickness], center = true);

    ribbon_clamp_hole_positions(ways, screw)
        vflip()
           translate_z(thickness)
                screw_and_washer(screw, screw_length, true);
}

module ribbon_clamp_20_stl() ribbon_clamp(20);
module ribbon_clamp_8_2_stl() ribbon_clamp(8, M2_dome_screw);
module ribbon_clamp_7_2_stl() ribbon_clamp(8, M2_dome_screw);

//! * Place inserts into the holes and press home with a soldering iron with a conical bit heated to 200&deg;C.
module ribbon_clamp_20_assembly() ribbon_clamp_assembly(20);

//! * Place inserts into the holes and press home with a soldering iron with a conical bit heated to 200&deg;C.
module ribbon_clamp_8_2_assembly() ribbon_clamp_assembly(8, M2_dome_screw);

//! * Place inserts into the holes and press home with a soldering iron with a conical bit heated to 200&deg;C.
module ribbon_clamp_7_2_assembly() ribbon_clamp_assembly(8, M2_dome_screw);