sealing-box.scad.m4

   1 // -*- C -*-
   2
   3 // This file can be used in two ways:
   4 //
   5 // A. Rectangular boxes
   6 //      1. include <sealing-box.scad>
   7 //      2. assign() values to (xxx these should be $ variables)
   8 //           $sealingbox_wallth
   9 //           $sealingbox_sz[0] (outer dimension)
  10 //           $sealingbox_sz[1] (outer dimension)
  11 //           $sealingbox_sz[2] (inner dimension)
  12 //           $sealingbox_ceilth
  13 //           $sealingbox_floorth
  14 //           $sealingbox_wallth
  15 //      3. use the modules
  16 //           SealingBox_RectBox
  17 //           SealingBox_RectLid
  18 //           (origin is notional outside corner, but at level of
  19 //            inside of base; box extends to positive x,y,z)
  20 //
  21 // B. Complicated shapes, but harder work
  22 //      1. Be a .m4 file and m4_include sealing-box.scad.m4
  23 //      2. Define your own BoxDoShapeSomething like BoxDoShapeRect
  24 //      3. Invoke BoxUseShape
  25 //      4. Use the Box and Lid modules generated
  26 //
  27 // Other settings
  28 //  $sealingbox_cnrrad
  29
  30 $sealingbox_cnrrad = 10;
  31 $sealingbox_crude = false;
  32
  33 m4_define(`BoxLocals',`
  34   xbox = $sealingbox_sz[0];
  35   ybox = $sealingbox_sz[1];
  36   zbox = $sealingbox_sz[2];
  37   wall = $sealingbox_wallth;
  38   floorth = $sealingbox_floorth;
  39   ceilth = $sealingbox_ceilth;
  40   cnrrad = $sealingbox_cnrrad;
  41
  42   xbox_lin = xbox - cnrrad*2;
  43   ybox_lin = ybox - cnrrad*2;
  44 ')
  45
  46 m4_define(`innertube', `(1.0 + 0.2)')
  47 m4_define(`lidoverlap', `1.5')
  48 m4_define(`lidoverhang', `6')
  49 m4_define(`tubesealrad', `2.0')
  50
  51 m4_define(`BoxFn',`$fn= $sealingbox_crude ? ($2) : ($1)')
  52
  53 m4_dnl Box_Part($1=transl_x,$2=transl_y, $3=rot_z,$4=mirror_xy)
  54 m4_dnl          $5=kind, $6=kindargs, $7=profile(profileargsargs))
  55 m4_define(`Box_Part',`
  56   translate([($1),($2)])
  57     rotate([0,0,($3)])
  58     mirror([($4),0,0])
  59     BoxPart_Extrude_$5($6, $7)') m4_dnl
  60
  61 boxpart_d = 0.01;
  62
  63 m4_dnl BoxPart_Extrude_Linear(dist, `profile(...);');
  64 m4_define(`BoxPart_Extrude_Linear',`
  65   rotate([90,0,0])
  66     translate([0,0, -($1)])
  67     linear_extrude(height= boxpart_d + ($1)) {
  68       $2
  69     }
  70 ')
  71
  72 m4_dnl BoxPart_Extrude_Arc(x0_radius, swept_angle, `profile(...);')
  73 m4_dnl  arc starting at transl_x, transl_y, moving towards positive
  74 m4_dnl  y at first and then bending towards negative x, until
  75 m4_dnl  use negative x0_radius to inciate bending towards positive x
  76 m4_dnl  swept_angle is reached
  77 m4_dnl  x0_radius is the radius of the extruded part at x=0, not of the box
  78 m4_define(`BoxPart_Extrude_Arc',`
  79   translate([-($1),0,0])
  80     intersection(){
  81       translate([0,0,-500])
  82         linear_extrude(height=1000)
  83         scale(500)
  84         mirror([($1)<0, 0,0])
  85         FArcSegment_mask($2);
  86       rotate_extrude(convexity=10, $fs=1, BoxFn(36,8))
  87         mirror([($1)<0, 0,0])
  88         translate([+($1),0,0]){
  89           $3
  90         }
  91     }
  92 ')
  93
  94 m4_dnl BoxDoShapeRect(`profile(profileargs)');
  95 m4_define(`BoxDoShapeRect',`
  96   Box_Part(0,           cnrrad,         0,0, Linear,`ybox_lin', `$1' )
  97   Box_Part(0,           ybox-cnrrad,    0,0, Arc,`-cnrrad,90' , `$1' )
  98   Box_Part(cnrrad,      ybox,         -90,0, Linear,`xbox_lin', `$1' )
  99   Box_Part(xbox-cnrrad, ybox,         -90,0, Arc,`-cnrrad,90' , `$1' )
 100   Box_Part(xbox,        ybox-cnrrad, -180,0, Linear,`ybox_lin', `$1' )
 101   Box_Part(xbox,        cnrrad,      -180,0, Arc,`-cnrrad,90' , `$1' )
 102   Box_Part(xbox-cnrrad, 0,           -270,0, Linear,`xbox_lin', `$1' )
 103   Box_Part(cnrrad,      0,           -270,0, Arc,`-cnrrad,90' , `$1' )
 104 ')
 105
 106 m4_dnl '
 107
 108 module SealingBox_WallProfile(){
 109   BoxLocals
 110   z = zbox - innertube - tubesealrad;
 111   translate([0, -0.1]) square([wall, z]);
 112   translate([tubesealrad, z]) circle(r=tubesealrad, BoxFn(20,6));
 113 }
 114
 115 module SealingBox_FloorProfile(){
 116   BoxLocals
 117   mirror([0,1]) square([wall, floorth]);
 118 }
 119
 120 function SealingBox_lidbigger() = lidoverlap + innertube;
 121
 122 module SealingBox_LidProfile(){
 123   BoxLocals
 124   rad = tubesealrad + innertube;
 125   morex = wall;
 126   difference(){
 127     translate([0, zbox + ceilth]) mirror([0,1]) {
 128       translate([-SealingBox_lidbigger(),
 129                  0])
 130       square([lidoverlap + innertube + tubesealrad,
 131               lidoverhang + innertube + ceilth]);
 132       square([tubesealrad*2 + innertube + lidoverlap,
 133               tubesealrad*1.5 + innertube + ceilth]);
 134     }
 135     hull(){
 136       translate([tubesealrad,
 137                  zbox - innertube - tubesealrad])
 138         for (t=[ [0,0],
 139                  [0, -zbox]
 140                  ]) {
 141           translate(t)
 142             circle(r= tubesealrad + innertube, BoxFn(20,6));
 143         }
 144     }
 145   }
 146 }
 147
 148 module SealingBox_CeilProfile(){
 149   BoxLocals
 150   translate([0, zbox])
 151     square([wall*2, ceilth]);
 152 }
 153
 154 // BoxDoShape(Basename,BoxDoShapeSomething)
 155 // generates modules BasenameBox and BasenameLid
 156 m4_define(`BoxUseShape',`
 157   module $1Box(){
 158     BoxLocals
 159     $2(SealingBox_WallProfile(););
 160     hull(){ $2(SealingBox_FloorProfile();); }
 161   }
 162
 163   module $1Lid(){
 164     BoxLocals
 165     $2(SealingBox_LidProfile(););
 166     hull(){ $2(SealingBox_CeilProfile();); }
 167   }
 168 ')
 169
 170 BoxUseShape(`SealingBox_Rect',`BoxDoShapeRect')