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   topcylr = max(plugwmax/2,
  68                 trestlelegw/2,
  69                 sqrt(plugwmin*2/4 + plugh*plugh)
  70                 ) + topcylthick + trestleplugd;
  71
  72   difference(){
  73     union(){
  74       for (mir=[0,1]) {
  75         mirror([mir,0,0]) {
  76           rotate([0,0, -90-legang])
  77             ExtenderPillars(length=eplen+trestlelegw,
  78                             width=trestlelegw,
  79                             height=plugl,
  80                             baseweb=true);
  81
  82           translate([-trestlebase/2, -trestleheight, 0])
  83             cylinder(r=trestlelegw/2*1.2, h=plugl);
  84         }
  85       }
  86       intersection(){
  87         translate([0, 3, 0])
  88           cylinder(r=topcylr, h=plugl);
  89         translate([-50, -topcylbasedepth, -1])
  90           cube([100, 50, plugl+2]);
  91       }
  92
  93       translate([-trestlebase/2, -trestleheight, 0])
  94         ExtenderPillars(length=trestlebase, width=trestlebaseh*2, height=plugl);
  95     }
  96     translate([-300, -trestleheight-50, -1])
  97       cube([600, 50, plugl+2]);
  98
  99     rotate([-90,-90,0])
 100       Plug(d=trestleplugd);
 101   }
 102 }
 103
 104 //Bar();
 105 Trestle();
 106
 107 //Plug(d=1);
 108 //ExtenderPillars(80,12,8, baseweb=true);