tube-crossdrill-jig.scad

   1 // -*- C -*-
   2
   3 $fs=0.1;
   4 $fa=3;
   5
   6 rearwallthick = 3;
   7 basethick = 3;
   8 mainframeendthick = 2.5;
   9
  10 tubedia = 16 + 0.8;
  11 tubetubethick=2;
  12 tubetubetopslop=1;
  13
  14 boltholedia = 6.5 + 0.5;
  15 boltholeslotshorter = 6;
  16 mainframeholedia = 5 + 0.5;
  17
  18 // "slot" refers to the things in the base of the drill press stand
  19 backslotedgespace = 71;
  20 slotwidth = 11.5;
  21 backslotmid2screwhole = 17;
  22 slotplugheight = 5.5;
  23 slotplugdepth = 10;
  24
  25 // "keepslot" refers to the screws in the wooden jig block
  26 keepslotstartz = 20;
  27 keepslotlen = 25;
  28 keepslotx = backslotedgespace / 2;
  29 keepslotwidth = 4;
  30
  31 mainframeextraside = 15;
  32 mainframeextrafront = 25;
  33
  34 rearwallstrengthwidth = 10;
  35 keepslotclear = 10;
  36
  37 // computed values
  38
  39 mainframeholex = backslotedgespace/2 + slotwidth/sqrt(2) +
  40   backslotmid2screwhole / sqrt(2);
  41
  42 mainframeholey = -backslotmid2screwhole / sqrt(2);
  43
  44 mainframemaxx = mainframeholex + mainframeextraside;
  45 mainframeminy = mainframeholey - mainframeextrafront;
  46 mainframemaxz = keepslotstartz + keepslotlen;
  47
  48 module MainFrame(){
  49   for (m=[0,1]) {
  50     mirror([m,0,0]) {
  51       translate([-1, mainframeminy, 0])
  52         cube([mainframemaxx+1, -mainframeminy, basethick]);
  53       translate([-1, -rearwallthick, 0])
  54         cube([mainframemaxx+1, rearwallthick, mainframemaxz]);
  55
  56       for (x=[keepslotx - keepslotclear, mainframemaxx - 0.5]) {
  57         translate([x,0,0])
  58           rotate([90,0,-90])
  59           linear_extrude(height=mainframeendthick)
  60           polygon([[-mainframeminy, 0],
  61                    [0, mainframemaxz],
  62                    [0, 0]]);
  63       }
  64
  65       translate([backslotedgespace/2, 0, 1])
  66         mirror([0,0,1])
  67         linear_extrude(height=slotplugheight+1)
  68         polygon([[0,0],
  69                  [slotwidth * sqrt(2), 0],
  70                  [slotplugdepth / sqrt(2) + slotwidth * sqrt(2),
  71                   -slotplugdepth],
  72                  [slotplugdepth / sqrt(2), -slotplugdepth]]);
  73       translate([-1,
  74                  -rearwallthick - boltholeslotshorter + 0.2,
  75                  tubedia + tubetubetopslop + tubetubethick + 4])
  76         cube([keepslotx - keepslotclear + 1,
  77               boltholeslotshorter + 0.5,
  78               rearwallstrengthwidth]);
  79     }
  80   }
  81 }
  82
  83 module TubeThing(extralen, dia, extraheight, underheight){
  84   effheight = tubetubetopslop + extraheight + underheight;
  85   len = -mainframeminy + extralen * 2;
  86   translate([0, mainframeminy - extralen, -underheight]) {
  87     translate([0,0, dia/2 + effheight])
  88       rotate([-90,0,0]) cylinder(h=len, r=dia/2);
  89     translate([-dia/2, 0, 0])
  90       cube([dia, len, effheight + dia/2]);
  91   }
  92 }
  93
  94 module Jig(){
  95   difference(){
  96     union(){
  97       MainFrame();
  98       TubeThing(0, tubedia+tubetubethick*2, -tubetubethick, 0);
  99     }
 100     union(){
 101       translate([0,0,-0.1])
 102         TubeThing(10, tubedia, 0, 5);
 103       translate([-boltholedia/2, mainframeminy - 1, -5])
 104         cube([boltholedia,
 105               -mainframeminy + 1 - rearwallthick - boltholeslotshorter,
 106               mainframemaxz + 10]);
 107       for (m=[0,1]) {
 108         mirror([m,0,0]) {
 109           translate([mainframeholex, mainframeholey, -30])
 110             cylinder(h=basethick+40, r=mainframeholedia/2);
 111           translate([keepslotx - keepslotwidth/2,
 112                      -10, keepslotstartz])
 113             cube([keepslotwidth, 20, keepslotlen + 10]);
 114         }
 115       }
 116     }
 117   }
 118 }
 119
 120 //MainFrame();
 121 //TubeThing(0, tubedia);
 122
 123 rotate([-90,0,0])
 124   Jig();