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
  32 m4_define(`BoxLocals',`
  33   xbox = $sealingbox_sz[0];
  34   ybox = $sealingbox_sz[1];
  35   zbox = $sealingbox_sz[2];
  36   wall = $sealingbox_wallth;
  37   floorth = $sealingbox_floorth;
  38   ceilth = $sealingbox_ceilth;
  39   cnrrad = $sealingbox_cnrrad;
  40
  41   xbox_lin = xbox - cnrrad*2;
  42   ybox_lin = ybox - cnrrad*2;
  43
  44   innertube = 1.0 + 0.2;
  45   lidoverlap = 1.5;
  46   lidoverhang = 6;
  47   tubesealrad = 2.0;
  48 ')
  49
  50 m4_dnl Box_Part($1=transl_x,$2=transl_y, $3=rot_z,$4=mirror_xy)
  51 m4_dnl          $5=kind, $6=kindargs, $7=profile(profileargsargs))
  52 m4_define(`Box_Part',`
  53   translate([($1),($2)])
  54     rotate([0,0,($3)])
  55     mirror([($4),0,0])
  56     BoxPart_Extrude_$5($6, $7)') m4_dnl
  57
  58 boxpart_d = 0.01;
  59
  60 m4_dnl BoxPart_Extrude_Linear(dist, `profile(...);');
  61 m4_define(`BoxPart_Extrude_Linear',`
  62   rotate([90,0,0])
  63     translate([0,0, -($1)])
  64     linear_extrude(height= boxpart_d + ($1)) {
  65       $2
  66     }
  67 ')
  68
  69 m4_dnl BoxPart_Extrude_Arc(x0_radius, swept_angle, `profile(...);')
  70 m4_dnl  arc starting at transl_x, transl_y, moving towards positive
  71 m4_dnl  y at first and then bending towards negative x, until
  72 m4_dnl  use negative x0_radius to inciate bending towards positive x
  73 m4_dnl  swept_angle is reached
  74 m4_dnl  x0_radius is the radius of the extruded part at x=0, not of the box
  75 m4_define(`BoxPart_Extrude_Arc',`
  76   translate([-($1),0,0])
  77     intersection(){
  78       translate([0,0,-500])
  79         linear_extrude(height=1000)
  80         scale(500)
  81         mirror([($1)<0, 0,0])
  82         FArcSegment_mask($2);
  83       rotate_extrude(convexity=10, $fs=1, $fn=36)
  84         mirror([($1)<0, 0,0])
  85         translate([+($1),0,0]){
  86           $3
  87         }
  88     }
  89 ')
  90
  91 m4_dnl BoxDoShapeRect(`profile(profileargs)');
  92 m4_define(`BoxDoShapeRect',`
  93   Box_Part(0,           cnrrad,         0,0, Linear,`ybox_lin', `$1' )
  94   Box_Part(0,           ybox-cnrrad,    0,0, Arc,`-cnrrad,90' , `$1' )
  95   Box_Part(cnrrad,      ybox,         -90,0, Linear,`xbox_lin', `$1' )
  96   Box_Part(xbox-cnrrad, ybox,         -90,0, Arc,`-cnrrad,90' , `$1' )
  97   Box_Part(xbox,        ybox-cnrrad, -180,0, Linear,`ybox_lin', `$1' )
  98   Box_Part(xbox,        cnrrad,      -180,0, Arc,`-cnrrad,90' , `$1' )
  99   Box_Part(xbox-cnrrad, 0,           -270,0, Linear,`xbox_lin', `$1' )
 100   Box_Part(cnrrad,      0,           -270,0, Arc,`-cnrrad,90' , `$1' )
 101 ')
 102
 103 m4_dnl '
 104
 105 module SealingBox_WallProfile(){
 106   BoxLocals
 107   z = zbox - innertube - tubesealrad;
 108   translate([0, -0.1]) square([wall, z]);
 109   translate([tubesealrad, z]) circle(r=tubesealrad, $fn=20);
 110 }
 111
 112 module SealingBox_FloorProfile(){
 113   BoxLocals
 114   mirror([0,1]) square([wall, floorth]);
 115 }
 116
 117 module SealingBox_LidProfile(){
 118   BoxLocals
 119   rad = tubesealrad + innertube;
 120   morex = wall;
 121   difference(){
 122     translate([-lidoverlap - innertube,
 123                zbox - lidoverhang - innertube])
 124       square([lidoverlap + innertube + wall,
 125               lidoverhang + innertube + ceilth]);
 126     hull(){
 127       translate([tubesealrad,
 128                  zbox - innertube - tubesealrad])
 129         for (t=[ [0,0],
 130                  [morex*2, 0],
 131                  [0, -zbox]
 132                  ]) {
 133           translate(t)
 134             circle(r= tubesealrad + innertube, $fn=20);
 135         }
 136     }
 137   }
 138 }
 139
 140 module SealingBox_CeilProfile(){
 141   BoxLocals
 142   translate([0, zbox])
 143     square([wall*2, ceilth]);
 144 }
 145
 146 // BoxDoShape(Basename,BoxDoShapeSomething)
 147 // generates modules BasenameBox and BasenameLid
 148 m4_define(`BoxUseShape',`
 149   module $1Box(){
 150     BoxLocals
 151     $2(SealingBox_WallProfile(););
 152     hull(){ $2(SealingBox_FloorProfile();); }
 153   }
 154
 155   module $1Lid(){
 156     BoxLocals
 157     $2(SealingBox_LidProfile(););
 158     hull(){ $2(SealingBox_CeilProfile();); }
 159   }
 160 ')
 161
 162 BoxUseShape(`SealingBox_Rect',`BoxDoShapeRect')