scaffold-clamp.scad

   1 // -*- C -*-
   2
   3 include <utils.scad>
   4
   5 tube_dia = 48.3;
   6
   7 th = 7;
   8
   9 pin_gap = 1.0; // around
  10
  11 smooth_r = 10;
  12
  13 bolt_dia = 5 + 0.75;
  14 bolt_flat = 10 + 1;
  15
  16 open_gap = 10;
  17
  18 // calculated
  19
  20 pin_dia = th;
  21 hole_dia = th + pin_gap;
  22
  23 hinge_o_r = 0.5 * hole_dia + th;
  24
  25 hinge_x = -0.5 * tube_dia - hinge_o_r;
  26 bolt_x = 0.5 * tube_dia + bolt_flat * 0.5;
  27 max_x = bolt_x + max(0.5 + bolt_dia + th, 0.5 * bolt_flat/2);
  28
  29 flats_y = open_gap/2 + th;
  30
  31 $fa = 3;
  32 $fs = 0.1;
  33
  34 module Plan() {
  35   difference(){
  36     offset(r=-smooth_r) offset(delta=smooth_r)
  37       union(){
  38       translate([hinge_x, 0]) circle(r= hinge_o_r);
  39       circle(r = tube_dia/2 + th);
  40       rectfromto([0,           -flats_y],
  41                  [max_x,       +flats_y]);
  42     }
  43     circle(r = tube_dia/2);
  44     rectfromto([0,       -open_gap/2],
  45                [max_x+1, +open_gap/2]);
  46   }
  47 }
  48
  49 Plan();