// -*- C -*-

include <utils.scad>

tube_dia = 48.3;

th = 7;

pin_gap = 1.0; // around

smooth_r = 10;

bolt_dia = 5 + 0.75;
bolt_flat = 10 + 1;

open_gap = 10;

// calculated

pin_dia = th;
hole_dia = th + pin_gap;

hinge_o_r = 0.5 * hole_dia + th;

hinge_x = -0.5 * tube_dia - hinge_o_r;
bolt_x = 0.5 * tube_dia + bolt_flat * 0.5;
max_x = bolt_x + max(0.5 + bolt_dia + th, 0.5 * bolt_flat/2);

flats_y = open_gap/2 + th;

$fa = 3;
$fs = 0.1;

module Plan() {
  difference(){
    offset(r=-smooth_r) offset(delta=smooth_r)
      union(){
      translate([hinge_x, 0]) circle(r= hinge_o_r);
      circle(r = tube_dia/2 + th);
      rectfromto([0,           -flats_y],
		 [max_x,       +flats_y]);
    }
    circle(r = tube_dia/2);
    rectfromto([0,       -open_gap/2],
	       [max_x+1, +open_gap/2]);
  }
}

Plan();