tube-crossdrill-jig.scad

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