mic-camera-adapter.scad

   1 // -*- C -*-
   2
   3 // print on High Detail
   4 // but adjust infill to 50%
   5
   6 include <threads.scad>
   7
   8 inch = 25.4;
   9
  10 positive_dia = inch * 3/8. - 0.375;
  11 positive_l = inch * 1/2.;
  12
  13 negative_dia = inch * 1/4. + 0.375;
  14 negative_l =   10.0;
  15
  16 negative_wall = 4;
  17 midsection = 4;
  18
  19 spanner = 12;
  20
  21 negative_tpi = 20;
  22 negative_pitch = inch/negative_tpi;
  23 negative_chamfer = negative_pitch/2;
  24
  25 base_dia = 35;
  26 base_th_min = 1;
  27 base_th_max = 4;
  28
  29 //$test = true;
  30 $test = false;
  31 $fs=0.1;
  32 $fa=5;
  33
  34 module Adapter(){
  35   translate([0,0,-0.1])
  36     english_thread(diameter=positive_dia/inch, threads_per_inch=16,
  37                    leadin=1, test=$test,
  38                    length= (positive_l + 0.1) / inch);
  39   rotate([180,0,0]) {
  40     difference(){
  41       union(){
  42         cylinder(r= spanner/2 * 1/(0.5 * sqrt(3)),
  43                  h = negative_l + midsection,
  44                  $fn=6);
  45         translate([0,0, midsection+negative_l]) {
  46           mirror([0,0,1]) {
  47             hull(){
  48               cylinder(r= base_dia/2, h = base_th_min);
  49               cylinder(r= 0.1,        h = base_th_max);
  50             }
  51           }
  52         }
  53       }
  54       translate([0,0, midsection])
  55         english_thread(diameter=negative_dia/inch,
  56                        threads_per_inch=negative_tpi,
  57                        leadin=0, internal=true, test=$test,
  58                        length= (negative_l + inch/19) / inch);
  59       translate([0,0, midsection+negative_l]) {
  60         hull(){
  61           translate([0,0, negative_chamfer])
  62             cylinder(r= negative_dia/2 + negative_chamfer*2,
  63                      h=1);
  64           mirror([0,0,1])
  65             cylinder(r= negative_dia/2 - negative_chamfer*2,
  66                      h= negative_chamfer*3);
  67         }
  68       }
  69     }
  70   }
  71 }
  72
  73 Adapter();