filamenttrestle.scad

   1 // -*- C -*-
   2
   3 spoolwidth = 80; // fixme needs to be measured
   4 trestleheight = 80; // fixme needs to be checked
   5 trestlebase = 80; // fixme needs to be checked
   6
   7 include <doveclip.scad>
   8
   9 spoolwidthgap = 2;
  10 barrady = 5;
  11 barradz = 7;
  12 guidewidth = 3;
  13 guiderad = 20;
  14
  15 plugl = 12;
  16 plugwmin = 3;
  17 plugh = 10;
  18 plugslope = 0.5;
  19 plugwmax = plugwmin + plugh * plugslope * 2;
  20
  21 trestlelegw = 10;
  22 trestlebaseh = 10;
  23 trestleplugd = 1;
  24
  25 topcylthick = 3;
  26 topcylbasedepth = 4;
  27
  28 pindr = 0.5;
  29 pinholeminh = 1.0 + pindr;
  30 pinholemaxh = 1.5 + pindr;
  31 pinholewidth = 5;
  32
  33 module Plug(d=0){
  34   a = -atan(plugslope);
  35   tdx = d * cos(a);
  36   tdy = d * sin(a);
  37   bdx = d / cos(a);
  38   translate([-d,0,0]) rotate([90,0,90]) linear_extrude(height=plugl+0.1+d*2){
  39     polygon([[-(plugwmin/2 + bdx),  0],
  40              [-(plugwmax/2 + tdx),  plugh + tdy],
  41              [+(plugwmax/2 + tdx),  plugh + tdy],
  42              [+(plugwmin/2 + bdx),  0]]);
  43   }
  44 }
  45
  46 module Bar(){
  47   spoolw = spoolwidth + spoolwidthgap*2;
  48   barz = barradz * 0.5;
  49   biggestw = spoolw + 50;
  50
  51   intersection(){
  52     for (mir=[0,1]) {
  53       mirror([mir,0,0]) {
  54         translate([0,0,barz]) {
  55           scale([1,barrady,barradz]) translate([-1,0,0])
  56             rotate([0,90,0]) cylinder(r=1, h=spoolw/2+2, $fn=30);
  57           translate([spoolw/2,0,0])
  58             rotate([0,90,0]) cylinder(r=guiderad, h=guidewidth, $fn=60);
  59         }
  60         translate([spoolw/2 + guidewidth, 0, 0])
  61           Plug();
  62       }
  63     }
  64     translate([-biggestw/2, -50, 0])
  65       cube([biggestw, 100, 100]);
  66   }
  67 }
  68
  69 module Trestle(){
  70   legang = atan2(trestlebase/2, trestleheight);
  71   eplen = sqrt(trestleheight*trestleheight + trestlebase*trestlebase*0.25);
  72   topcylw = plugwmax + topcylthick*2;
  73
  74   difference(){
  75     union(){
  76       for (mir=[0,1]) {
  77         mirror([mir,0,0]) {
  78           rotate([0,0, -90-legang])
  79             ExtenderPillars(length=eplen+trestlelegw,
  80                             width=trestlelegw,
  81                             height=plugl,
  82                             baseweb=true);
  83
  84           translate([-trestlebase/2, -trestleheight, 0])
  85             cylinder(r=trestlelegw/2*1.2, h=plugl);
  86         }
  87       }
  88       translate([-topcylw/2, -topcylbasedepth, 0])
  89         cube([topcylw, topcylbasedepth + plugh + topcylthick, plugl]);
  90
  91       translate([-trestlebase/2, -trestleheight, 0])
  92         ExtenderPillars(length=trestlebase, width=trestlebaseh*2, height=plugl);
  93     }
  94     translate([-300, -trestleheight-50, -1])
  95       cube([600, 50, plugl+2]);
  96
  97     rotate([-90,-90,0])
  98       Plug(d=trestleplugd);
  99
 100     for (rot=[0,180]) {
 101       translate([0,0,plugl/2]) rotate([0,rot,0]) translate([0,0,-plugl/2]) {
 102         translate([0, plugh, plugl/4])
 103 #       linear_extrude(height = pinholewidth){
 104           for (mir=[0,1]) {
 105             mirror([0,mir,0]) {
 106               polygon([[-(topcylw/2+0.1), -0.1],
 107                        [-(topcylw/2+0.1), pinholeminh],
 108                        [0,                pinholeminh],
 109                        [+(topcylw/2+0.1), pinholemaxh],
 110                        [+(topcylw/2+0.1), -0.1]]);
 111             }
 112           }
 113         }
 114       }
 115     }
 116   }
 117 }
 118
 119 //Bar();
 120 Trestle();
 121
 122 //Plug(d=1);
 123 //ExtenderPillars(80,12,8, baseweb=true);