Trackball/hardware/bearing.scad

/*
 * Copyright (c) 2022 - 2023 Thomas Buck (thomas@xythobuz.de)
 *                           Philipp Schönberger (mail@phschoen.de)
 *
 * This program 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.
 *
 * This program 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.
 *
 * See <http://www.gnu.org/licenses/>.
 */

include <config.scad>;
include <BOSL2/std.scad>;
include <BOSL2/threading.scad>;

bearing_holder();

bearing_holder_mount();

//NOTE: [0,0,0] should be the "top" contact point of the bearings

module bearing_holder()
{
    difference()
    {
        if(bearing_type=="static") {
            bearing_holder_static();
        }

        if(bearing_type=="dynamic_m6_vcn320") {

            bearing_holder_m6_vcn320();
        }

        if(bearing_type=="dynamic_3d_vcn410") {
            bearing_holder_d3_vcn410();
        }

        // cut of the flange
        translate([0,bearing_mount_flange, 0])// move in by flange
        translate([0,-bearing_mount_dia/2, 0])// move to edge of cylinder
        translate([-bearing_mount_dia,-bearing_mount_dia, -bearing_h*2])// center on on half
        cube([bearing_mount_dia *2, bearing_mount_dia, bearing_h *3]);
    }
}

module bearing_holder_static()
{

    // glider ball itself
    %translate([0, 0, -bearing_static_dia/2])
    color([0.3,0.3,0.3,0.2])
    sphere(d = bearing_static_dia, $fn = $fn);

    difference()
    {
        // holder itself
        color("magenta")
        hull()
        {
            // hold static ball itself
            translate([0, 0, -bearing_static_dia -bearing_static_dia*0.35])
            cylinder(d1 = bearing_mount_dia, d2=bearing_static_dia+1,  h = bearing_static_dia);

            // bottom surface
            translate([0, 0, -bearing_h])
            cylinder(d = bearing_mount_dia, h = $e);

        }
        // cut the bearing on the side
//        #translate([-bearing_mount_dia / 2 - 1, bearing_mount_dia / 2 - bearing_holder_sider_cut, -1])
//        cube([bearing_mount_dia + 2, bearing_mount_dia / 2 + 1, bearing_h + 2]);

        // tiny hole through the complete holder to seperate the ball from the holder if needed
        color([0.9,0.5,0.5])// lightred
        translate([0, 0, -bearing_h-$e])
        cylinder(d = bearing_thread_hole, h = bearing_h+$e*2);

        // sphere cut of the holder itself
        color("gray")
        translate([0, 0, - bearing_static_dia / 2])
        sphere(d = bearing_static_dia, $fn = $fn);

        // cut in order to see through from the side
        if (cut_bearing_holder)
        translate([-bearing_mount_dia,-bearing_mount_dia, -bearing_h*2])
        cube([bearing_mount_dia *2, bearing_mount_dia, bearing_h *3]);
    }
}

module bearing_holder_m6_vcn320()
{
    l=bearing_h*0.7;
    d=3.18;
    l2=bearing_h-d*0.6;

    difference()
    {
        union()
        {
            // main holder part for the m6 screw
            translate([0,0,-bearing_h])
            cylinder(d=bearing_mount_dia,h=l);

            // ball bearing itself
            %union()
            {
                // ball itself
                color("red")
                translate([0,0,-d/2])
                sphere(d = d, $fn = $fn);

                // metal champer for the ball
                color("silver")
                translate([0,0,-1 + d*0.2 -d/2])
                cylinder(d2 = 3.5,d1 = 6,h=1);

                // m6 rod
                translate([0,0,-bearing_h+l2/2-$e])
                threaded_rod(d=6, l=l2+$e, pitch=1.0);
            }
        }
        // cut of the rod itself
        translate([0,0,-bearing_h+l2/2-$e])
        threaded_rod(d=6.1, l=l2, pitch=1.0);

        if (cut_bearing_holder)
        translate([-bearing_mount_dia,-bearing_mount_dia, -bearing_h*2])
        cube([bearing_mount_dia *2, bearing_mount_dia, bearing_h *3]);
    }
}

module bearing_holder_d3_vcn410()
{
    S=0.6;
    D1=3.6;
    d=2;
    L= 4;
    D=3;

    // bearing itself
    % color([1,1,1,0.0])
    {
        translate([0,0,-d/2])
        sphere(d=d);
        translate([0,0,-S-1])
        cylinder(d=D1,h=1);
        translate([0,0,-L-S])
        cylinder(d=D,h=L);
    }

    difference()
    {
        union()
        {
            translate([0,0,-bearing_h])
            cylinder(d=bearing_mount_dia,h=bearing_h-L);
            translate([0,0,-L-S+1/2])
            cylinder(d1=bearing_mount_dia,d2=D+1,h=L-1);
        }

        // tiny hole through the complete holder to seperate the ball from the holder if needed
        color([0.9,0.5,0.5])// lightred
        translate([0, 0, -bearing_h-$e])
        cylinder(d = bearing_thread_hole, h = bearing_h+$e*2);

        // cut for the bearing itself
        translate([0,0,-S-1])
        cylinder(d=D1+$c,h=1);

        translate([0,0,-L-S])
        cylinder(d=D+$c,h=L);
    }
}

module bearing_holder_mount()
{
    translate([0, 0, -1-bearing_h])
    {
        difference()
        {
            cylinder(d=bearing_mount_dia+wall,h=bearing_h*0.75);

            translate([0, 0, 1])
            cylinder(d=bearing_mount_dia+$c*2,h=bearing_h+$e);
        }
        // add the flange
        intersection()
        {
            cylinder(d=bearing_mount_dia+wall,h=bearing_h*0.75);

            // cut of the flange
            translate([0,bearing_mount_flange-$c, 0])// move in by flange
            translate([0,-bearing_mount_dia/2, 0])// move to edge of cylinder
            translate([-bearing_mount_dia,-bearing_mount_dia, -bearing_h*2])// center on on half
            cube([bearing_mount_dia *2, bearing_mount_dia, bearing_h *3]);
        }
    }
}