dovetail.scad

// project dovetail defaults are used. change at risk

default_min_width = 15;
default_max_width = default_min_width*1.5;
default_depth = 15/2;
default_clearance = 1;
default_height = 15;

// test examples
dovetail(); //height=80);
translate([0,-5/2,default_height/2])
        cube([default_max_width*1.5, 5, default_height], center=true);
translate([0,20,0]) 
    difference() 
    {
        translate([0,default_min_width/2,default_height/2])
        cube([default_max_width*1.5,
            default_min_width,default_height], center=true);
        dovetail(clearance=true);
    }
// end test
module dovetail(max_width=default_max_width, min_width=default_min_width, 
                depth=default_depth, height=default_height, clearance=false) {
    difference()
     { 
        clear = clearance ? default_clearance:0;
        d = default_max_width+clear;
        linear_extrude(height=height, convexity=2)
            dovetail_2d(d,
                       min_width + clear,
                        depth);
         translate([0,0,height-6])
         rotate([-90,0,0])
         scale([1,0.7,1])
         difference()
         {
             d = default_max_width+clear;
             cylinder(h=default_depth, d=d*2, $fn=120);
             cylinder(h=default_depth, d=d, $fn=120);
             translate([0,d,default_depth/2])
             cube([d*2,d*2,default_depth], center=true);
         }
     }
}

module dovetail_2d(max_width=11, min_width=5, depth=5) {
	angle=atan((max_width/2-min_width/2)/depth);
	echo("angle: ", angle);
	polygon(paths=[[0,1,2,3,0]], points=[[-min_width/2,0], [-max_width/2,depth], 
        [max_width/2, depth], [min_width/2,0]]);
}