light_bulb_ring.scad

function inches(x) = x * 25.4;
z_fight_epsilon = 0.0001;

total_height = inches(0.5040);
inner_diameter = inches(0.6225);
outside_diameter = inches(1.3219);
rear_spigot_outer_diameter = inches(0.7467);
rear_groove_inside_diameter = inches(0.9700);
front_spigot_outer_diameter = inches(1.0245);
front_spigot_inner_diameter = inches(0.7327);
keyways_inner_diameter = inches(0.7031);
front_shoulder_height = inches(0.1449);
front_spigot_inside_shoulder_depth = inches(0.0620);
rear_shoulder_height = inches(0.3080);
rear_groove_depth = inches(0.1102);
keyway_width = inches(0.1341);
outside_tennon_width = inches(0.3070);
outside_tennon_depth = inches(0.1449);
tennon_cut_size = outside_diameter/2;

points = [
    [front_spigot_inner_diameter/2, 0],
    [front_spigot_outer_diameter/2, 0],
    [front_spigot_outer_diameter/2, front_shoulder_height],
    [outside_diameter/2, front_shoulder_height],
    [outside_diameter/2, total_height-rear_shoulder_height],
    [rear_groove_inside_diameter/2, total_height-rear_shoulder_height],
    [rear_groove_inside_diameter/2, total_height-(rear_shoulder_height+rear_groove_depth)],
    [rear_spigot_outer_diameter/2, total_height-(rear_shoulder_height+rear_groove_depth)],
    [rear_spigot_outer_diameter/2, total_height],
    [inner_diameter/2, total_height],
    [inner_diameter/2, front_spigot_inside_shoulder_depth],
    [front_spigot_inner_diameter/2, front_spigot_inside_shoulder_depth],
    [front_spigot_inner_diameter/2, 0],
];

difference(){
    rotate_extrude(){
        polygon(points=points);
    }
    translate([0,0,-z_fight_epsilon])
        linear_extrude(total_height+2*z_fight_epsilon){
            rotate(45)
                intersection(){
                    circle(r=keyways_inner_diameter/2);
                    square([keyways_inner_diameter, keyway_width], center=true);
                }

            for(i=[-1,1]){
                translate([i*(tennon_cut_size/2+outside_tennon_width/2), outside_diameter/2+tennon_cut_size/2-outside_tennon_depth])
                    square([tennon_cut_size, tennon_cut_size], center=true);
            }
        }
}