// #######################################################
// ################### Linear Bearings ###################
// #######################################################

lm8uu_outer = 15;
lm8uu_inner = 8;
lm8uu_height = 24;
lm8luu_height = 45;

// TODO
lm10uu_outer = 19;
lm10uu_inner = 10;
lm10uu_height = 29;
lm10luu_height = 55;

// TODO
lm12uu_outer = 21;
lm12uu_inner = 12;
lm12uu_height = 30;
lm12luu_height = 57;

cable_tie_width = 3.5;
cable_tie_height = 2.0;
cable_tie_dia_add = 1.0;

rail_mount_wall = 5;
rail_mount_len = 10;
rail_mount_block = 22;
rail_y_off_1 = 10;
cutout_width = 0.5;

draw_rail_mount = false;
draw_bearings = false;

// #######################################################

if (draw_rail_mount) {
    rail_mount(30, 8, 10);
    
    translate([20, 20, 0])
        rail_mount(30, 10, 20);
    
    translate([40, 0, 0])
        rail_mount(30, 12, 10);
}

if (draw_bearings) {
    lm8uu();
    translate([0, 20, 0])
        lm8luu();
    translate([0, 20, 30])
        lm8uu_cable_tie();
    
    translate([25, 0, 0])
        lm10uu();
    translate([25, 25, 0])
        lm10luu();
    translate([25, 25, 30])
        lm10uu_cable_tie();
    
    translate([55, 0, 0])
        lm12uu();
    translate([55, 30, 0])
        lm12luu();
    translate([55, 30, 30])
        lm12uu_cable_tie();
}

// #######################################################

function lmXuu_outer(dia) =
    (dia == 8) ? lm8uu_outer :
        ((dia == 10) ? lm10uu_outer :
            ((dia == 12) ? lm12uu_outer : 0));

function lmXuu_height(dia) =
    (dia == 8) ? lm8uu_height :
        ((dia == 10) ? lm10uu_height :
            ((dia == 12) ? lm12uu_height : 0));

module lmXuu(dia) {
    if (dia == 8) {
        lm8uu();
    } else if (dia == 10) {
        lm10uu();
    } else if (dia == 12) {
        lm12uu();
    }
}

module lmXluu(dia) {
    if (dia == 8) {
        lm8luu();
    } else if (dia == 10) {
        lm10luu();
    } else if (dia == 12) {
        lm12luu();
    }
}

module lmXuu_cable_tie(dia) {
    if (dia == 8) {
        lm8uu_cable_tie();
    } else if (dia == 10) {
        lm10uu_cable_tie();
    } else if (dia == 12) {
        lm12uu_cable_tie();
    }
}

module lm8uu() {
    $fn = 15;
    difference() {
        cylinder(d = lm8uu_outer, h = lm8uu_height);
        translate([0, 0, -1])
            cylinder(d = lm8uu_inner, h = lm8uu_height + 2);
    }
}

module lm8luu() {
    $fn = 15;
    difference() {
        cylinder(d = lm8uu_outer, h = lm8luu_height);
        translate([0, 0, -1])
            cylinder(d = lm8uu_inner, h = lm8luu_height + 2);
    }
}

module lm8uu_cable_tie() {
    difference() {
        union() {
            cylinder(d = lm8uu_outer + (2 * (cable_tie_height + cable_tie_dia_add)), h = cable_tie_width);
            
            translate([-8.5, 6, 0])
                cube([17, 10, cable_tie_width]);
        }
        translate([0, 0, -1])
            cylinder(d = lm8uu_outer + (2 * cable_tie_dia_add), h = cable_tie_width + 2);
    }
}


module lm10uu() {
    $fn = 15;
    difference() {
        cylinder(d = lm10uu_outer, h = lm10uu_height);
        translate([0, 0, -1])
            cylinder(d = lm10uu_inner, h = lm10uu_height + 2);
    }
}

module lm10luu() {
    $fn = 15;
    difference() {
        cylinder(d = lm10uu_outer, h = lm10luu_height);
        translate([0, 0, -1])
            cylinder(d = lm10uu_inner, h = lm10luu_height + 2);
    }
}

module lm10uu_cable_tie() {
    difference() {
        union() {
            cylinder(d = lm10uu_outer + (2 * (cable_tie_height + cable_tie_dia_add)), h = cable_tie_width);
            
            translate([-8.5, 6, 0])
                cube([17, 10, cable_tie_width]);
        }
        translate([0, 0, -1])
            cylinder(d = lm10uu_outer + (2 * cable_tie_dia_add), h = cable_tie_width + 2);
    }
}

module lm12uu() {
    $fn = 15;
    difference() {
        cylinder(d = lm12uu_outer, h = lm12uu_height);
        translate([0, 0, -1])
            cylinder(d = lm12uu_inner, h = lm12uu_height + 2);
    }
}

module lm12luu() {
    $fn = 15;
    difference() {
        cylinder(d = lm12uu_outer, h = lm12luu_height);
        translate([0, 0, -1])
            cylinder(d = lm12uu_inner, h = lm12luu_height + 2);
    }
}

module lm12uu_cable_tie() {
    difference() {
        union() {
            cylinder(d = lm12uu_outer + (2 * (cable_tie_height + cable_tie_dia_add)), h = cable_tie_width);
            
            translate([-8.5, 6, 0])
                cube([17, 10, cable_tie_width]);
        }
        translate([0, 0, -1])
            cylinder(d = lm12uu_outer + (2 * cable_tie_dia_add), h = cable_tie_width + 2);
    }
}

// #######################################################

module rail_mount(slot, dia, rail_mount_len = rail_mount_len) {
    $fn = 20;
    
    rail_mount_height = rail_y_off_1 + dia;
    
    echo(rail_mount_len=rail_mount_len, rail_dia=dia);
    
    difference() {
        union() {
            // main body
            cube([rail_mount_wall, rail_mount_len, 2 * slot]);
            
            // rail clamp
            translate([rail_mount_wall, 0, ((2 * slot) - rail_mount_block ) / 2])
                cube([rail_mount_height, rail_mount_len, rail_mount_block]);
        }

        // M4 slot mounting holes
        translate([-1, rail_mount_len / 2, slot / 2])
            rotate([0, 90, 0])
            cylinder(d = 4.2, h = rail_mount_wall + 2);
        translate([-1, rail_mount_len / 2, slot * 3 / 2])
            rotate([0, 90, 0])
            cylinder(d = 4.2, h = rail_mount_wall + 2);
        
        translate([dia / 2 + rail_y_off_1, -1, slot])
            rotate([-90, 0, 0])
            cylinder(d = dia + 0.1, h = rail_mount_len + 2);
        
        // clamping cutout
        translate([rail_y_off_1 + (dia - cutout_width) / 2, -1, ((2 * slot) - (rail_mount_block + 2)) / 2])
            cube([cutout_width, rail_mount_len + 2, rail_mount_block + 2]);
        
        translate([-1, rail_mount_len / 2, slot + rail_mount_block / 3])
        rotate([0, 90, 0]) {
            cylinder(d = 3.2, h = rail_mount_height + rail_mount_wall + 2);
            
            cylinder(d = 6.1, h = 3.8, $fn = 6);
            
            translate([0, 0, rail_mount_height + rail_mount_wall -2.5])
                cylinder(d = 6.1, h = 3.8);
        }
        
        translate([-1, rail_mount_len / 2, slot - rail_mount_block / 3])
        rotate([0, 90, 0]) {
            cylinder(d = 3.2, h = rail_mount_height + rail_mount_wall + 2);
            
            cylinder(d = 6.1, h = 3.8, $fn = 6);
            
            translate([0, 0, rail_mount_height + rail_mount_wall -2.5])
                cylinder(d = 6.1, h = 3.8);
        }
        
        translate([-10, -10, -22])
            cube([30, rail_mount_len + 20, 30]);
        
        translate([-10, -10, 2 * slot - 8])
            cube([30, rail_mount_len + 20, 30]);
    }
}