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 $sealingbox_inner_slop = 0.2;
  33
  34 m4_define(`BoxLocals',`
  35   xbox = $sealingbox_sz[0];
  36   ybox = $sealingbox_sz[1];
  37   zbox = $sealingbox_sz[2];
  38   wall = $sealingbox_wallth;
  39   floorth = $sealingbox_floorth;
  40   ceilth = $sealingbox_ceilth;
  41   cnrrad = $sealingbox_cnrrad;
  42
  43   xbox_lin = xbox - cnrrad*2;
  44   ybox_lin = ybox - cnrrad*2;
  45 ')
  46
  47 m4_define(`innertube', `(1.0 + 0.2)')
  48 m4_define(`lidoverlap', `1.5')
  49 m4_define(`lidoverhang', `6')
  50 m4_define(`tubesealrad', `2.0')
  51
  52 m4_define(`BoxFn',`$fn= $sealingbox_crude ? ($2) : ($1)')
  53
  54 m4_dnl Box_Part($1=transl_x,$2=transl_y, $3=rot_z,$4=mirror_xy)
  55 m4_dnl          $5=kind, $6=kindargs, $7=profile(profileargsargs))
  56 m4_define(`Box_Part',`
  57   translate([($1),($2)])
  58     rotate([0,0,($3)])
  59     mirror([($4),0,0])
  60     BoxPart_Extrude_$5($6, $7)') m4_dnl
  61
  62 boxpart_d = 0.01;
  63
  64 m4_dnl BoxPart_Extrude_Linear(dist, `profile(...);');
  65 m4_define(`BoxPart_Extrude_Linear',`
  66   rotate([90,0,0])
  67     translate([0,0, -($1)])
  68     linear_extrude(height= boxpart_d + ($1)) {
  69       $2
  70     }
  71 ')
  72
  73 m4_dnl BoxPart_Extrude_Arc(x0_radius, swept_angle, `profile(...);')
  74 m4_dnl  arc starting at transl_x, transl_y, moving towards positive
  75 m4_dnl  y at first and then bending towards negative x, until
  76 m4_dnl  use negative x0_radius to inciate bending towards positive x
  77 m4_dnl  swept_angle is reached
  78 m4_dnl  x0_radius is the radius of the extruded part at x=0, not of the box
  79 m4_define(`BoxPart_Extrude_Arc',`
  80   translate([-($1),0,0])
  81     intersection(){
  82       translate([0,0,-500])
  83         linear_extrude(height=1000)
  84         scale(500)
  85         mirror([($1)<0, 0,0])
  86         FArcSegment_mask($2);
  87       rotate_extrude(convexity=10, $fs=1, BoxFn(36,8))
  88         mirror([($1)<0, 0,0])
  89         translate([+($1),0,0]){
  90           $3
  91         }
  92     }
  93 ')
  94
  95 m4_dnl BoxDoShapeRect(`profile(profileargs)');
  96 m4_define(`BoxDoShapeRect',`
  97   Box_Part(0,           cnrrad,         0,0, Linear,`ybox_lin', `$1' )
  98   Box_Part(0,           ybox-cnrrad,    0,0, Arc,`-cnrrad,90' , `$1' )
  99   Box_Part(cnrrad,      ybox,         -90,0, Linear,`xbox_lin', `$1' )
 100   Box_Part(xbox-cnrrad, ybox,         -90,0, Arc,`-cnrrad,90' , `$1' )
 101   Box_Part(xbox,        ybox-cnrrad, -180,0, Linear,`ybox_lin', `$1' )
 102   Box_Part(xbox,        cnrrad,      -180,0, Arc,`-cnrrad,90' , `$1' )
 103   Box_Part(xbox-cnrrad, 0,           -270,0, Linear,`xbox_lin', `$1' )
 104   Box_Part(cnrrad,      0,           -270,0, Arc,`-cnrrad,90' , `$1' )
 105 ')
 106
 107 m4_dnl '
 108
 109 module SealingBox_WallProfile(){
 110   BoxLocals
 111   z = zbox - innertube - tubesealrad;
 112   translate([0, -0.1]) square([wall, z]);
 113   translate([tubesealrad, z]) circle(r=tubesealrad, BoxFn(20,6));
 114 }
 115
 116 module SealingBox_FloorProfile(){
 117   BoxLocals
 118   mirror([0,1]) square([wall, floorth]);
 119 }
 120
 121 function SealingBox_lidbigger() = lidoverlap + innertube;
 122
 123 module SealingBox_LidProfile(){
 124   BoxLocals
 125   rad = tubesealrad + innertube;
 126   morex = wall;
 127   inner_buttress_h = tubesealrad*1.5 + innertube + ceilth;
 128
 129   difference(){
 130     translate([0, zbox + ceilth]) mirror([0,1]) {
 131       translate([-SealingBox_lidbigger(),
 132                  0])
 133       square([lidoverlap + innertube + tubesealrad,
 134               lidoverhang + innertube + ceilth]);
 135       square([tubesealrad*2 + innertube + lidoverlap,
 136               inner_buttress_h]);
 137     }
 138     hull(){
 139       translate([tubesealrad,
 140                  zbox - innertube - tubesealrad])
 141         for (t=[ [0,0],
 142                  [0, -zbox]
 143                  ]) {
 144           translate(t)
 145             circle(r= tubesealrad + innertube, BoxFn(20,6));
 146         }
 147     }
 148   }
 149   translate([tubesealrad*2 + $sealingbox_inner_slop,
 150              zbox + ceilth]) {
 151     mirror([0,1]) {
 152       square([lidoverlap + innertube,
 153               inner_buttress_h]);
 154     }
 155   }
 156 }
 157
 158 module SealingBox_CeilProfile(){
 159   BoxLocals
 160   translate([0, zbox])
 161     square([wall*2, ceilth]);
 162 }
 163
 164 // BoxDoShape(Basename,BoxDoShapeSomething)
 165 // generates modules BasenameBox and BasenameLid
 166 m4_define(`BoxUseShape',`
 167   module $1Box(){
 168     BoxLocals
 169     $2(SealingBox_WallProfile(););
 170     hull(){ $2(SealingBox_FloorProfile();); }
 171   }
 172
 173   module $1Lid(){
 174     BoxLocals
 175     $2(SealingBox_LidProfile(););
 176     hull(){ $2(SealingBox_CeilProfile();); }
 177   }
 178 ')
 179
 180 BoxUseShape(`SealingBox_Rect',`BoxDoShapeRect')