include <BOSL2/std.scad>

out_d = 50;
ch_d = 8;
t = 2;

ang = 160;

$fn = 180;

module cut_arc(side) {

    path = arc(points=[
        [-out_d/2,0],
        [0,out_d/2 * tan(ang/4)],
        [out_d/2,0]
    ]);

    path_extrude2d(path,caps=false) {
        difference() {
            // circle(d=ch_d + t);
            rect([ch_d + t,ch_d + t]);
            circle(d=ch_d);
            rect([20,20], anchor=side);
        }
    }
}

cut_arc(RIGHT);