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 module Plug(d=0){
  29   a = -atan(plugslope);
  30   tdx = d * cos(a);
  31   tdy = d * sin(a);
  32   bdx = d / cos(a);
  33   translate([-d,0,0]) rotate([90,0,90]) linear_extrude(height=plugl+0.1+d*2){
  34     polygon([[-(plugwmin/2 + bdx),  0],
  35              [-(plugwmax/2 + tdx),  plugh + tdy],
  36              [+(plugwmax/2 + tdx),  plugh + tdy],
  37              [+(plugwmin/2 + bdx),  0]]);
  38   }
  39 }
  40
  41 module Bar(){
  42   spoolw = spoolwidth + spoolwidthgap*2;
  43   barz = barradz * 0.5;
  44   biggestw = spoolw + 50;
  45
  46   intersection(){
  47     for (mir=[0,1]) {
  48       mirror([mir,0,0]) {
  49         translate([0,0,barz]) {
  50           scale([1,barrady,barradz]) translate([-1,0,0])
  51             rotate([0,90,0]) cylinder(r=1, h=spoolw/2+2, $fn=30);
  52           translate([spoolw/2,0,0])
  53             rotate([0,90,0]) cylinder(r=guiderad, h=guidewidth, $fn=60);
  54         }
  55         translate([spoolw/2 + guidewidth, 0, 0])
  56           Plug();
  57       }
  58     }
  59     translate([-biggestw/2, -50, 0])
  60       cube([biggestw, 100, 100]);
  61   }
  62 }
  63
  64 module Trestle(){
  65   legang = atan2(trestlebase/2, trestleheight);
  66   eplen = sqrt(trestleheight*trestleheight + trestlebase*trestlebase*0.25);
  67   topcylw = plugwmax + topcylthick*2;
  68
  69   difference(){
  70     union(){
  71       for (mir=[0,1]) {
  72         mirror([mir,0,0]) {
  73           rotate([0,0, -90-legang])
  74             ExtenderPillars(length=eplen+trestlelegw,
  75                             width=trestlelegw,
  76                             height=plugl,
  77                             baseweb=true);
  78
  79           translate([-trestlebase/2, -trestleheight, 0])
  80             cylinder(r=trestlelegw/2*1.2, h=plugl);
  81         }
  82       }
  83       translate([-topcylw/2, -topcylbasedepth, 0])
  84         cube([topcylw, topcylbasedepth + plugh + topcylthick, plugl]);
  85
  86       translate([-trestlebase/2, -trestleheight, 0])
  87         ExtenderPillars(length=trestlebase, width=trestlebaseh*2, height=plugl);
  88     }
  89     translate([-300, -trestleheight-50, -1])
  90       cube([600, 50, plugl+2]);
  91
  92     rotate([-90,-90,0])
  93       Plug(d=trestleplugd);
  94   }
  95 }
  96
  97 //Bar();
  98 Trestle();
  99
 100 //Plug(d=1);
 101 //ExtenderPillars(80,12,8, baseweb=true);