// -*- C -*-

tube_dia = 48.3;

th = 6;

pin_gap = 1.0; // around

smooth_r = 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;

$fa = 3;
$fs = 0.1;

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

Plan();