chiark / gitweb /
fairphone-case: wip recesses for new prop
authorIan Jackson <ijackson@chiark.greenend.org.uk>
Fri, 26 Jan 2018 17:23:37 +0000 (17:23 +0000)
committerIan Jackson <ijackson@chiark.greenend.org.uk>
Fri, 26 Jan 2018 17:23:37 +0000 (17:23 +0000)
Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>
fairphone-case.scad

index f88a621..a41afd9 100644 (file)
@@ -4,17 +4,7 @@ include <utils.scad>
 
 phone = [ 75.0, 145.0 ];
 
-prop_lid_posns = [ 70 ]; // measured from bottom of phone
-
-prop_lengths = [ 80, 50 ];
-
-prop_angle_specs = [
-  // angle    prop length index     prop lid posn index
-  [   15,          1,                    0 ],
-  [   30,          1,                    0 ],
-  [   45,          0,                    0 ],
-  [   60,          0,                    0 ],
-  ];
+prop_angles = [ 15, 30, 45, 60 ];
 
 bumper = [ 0.250, -0.025 ];
 // ^ One side.  Overall size is increased by twice this.
@@ -120,20 +110,16 @@ catch_height = 0.35;
 catch_finger_height = 1.5;
 catch_finger_depth = 2.5;
 
-prop_main_width = 3;
-prop_wing_len = 3;
-prop_nose_slope = 1.5; // bigger means pointier
-prop_side_gap = 0.75; // each side
-prop_fin_height = 1.5;
-prop_fin_width = 0.75;
-prop_max_angle = 45; // bigger means at worse angle
-prop_recess_under = 0.30;
-prop_backfwd_gap = 1.0; // total
-
-prop_recess_slop = 0.125; // each side
+prop_recess_under = 0.50;
+prop_recess_slop = 0.200; // each side
 prop_end_dia = 0.5;
 prop_main_th = 3;
 prop_taper_len = 6;
+prop_main_width = 3;
+prop_side_gap = 0.75; // each side
+prop_caserecess_behind = 0.75;
+prop_caserecess_taper = 0.25; // each side
+prop_x_pos = 30;
 
 // ---------- calculated ----------
 
@@ -151,11 +137,13 @@ lid_buttoncover_overlap = case_th_lip + keeper_gap_z_top;
 
 phone_backside_slope_thick = phone_total_thick - phone_edge_thick;
 
+prop_lidrecess_depth = case_th_lid - prop_recess_under;
+
 prop_nose_len = case_th_lid - prop_recess_under;
 prop_recess_slope = tan(prop_max_angle); // bigger means steeper
-prop_recess_depth = case_th_lid - prop_recess_under;
 prop_recess_width = prop_main_th / cos(prop_max_angle) + prop_backfwd_gap;
 
+
 //lid_lip_overlap_width xxx bad name = ;
 //lid_lip_inner_slope = [ 5, 5 ]; // xxx
 
@@ -255,19 +243,28 @@ cppQ = [ cppR[0],
         cppV[1] - (catch_finger_height - cp_rQ) ];
 cppF = [ cppV[0] + catch_finger_depth, cppC[1] ];
 
-// prop recess
-
-prp1 = [0,0]; // by definition
-prp2 = prp1 + [ -prop_recess_slope, -1 ] * prop_recess_depth;
-prp4 = prp1 + [1,0] * prop_recess_width;
-prp3 = [ prp4[0], prp2[1] ];
-prp5 = prp4 + [1,0] * prop_recess_depth;
-
 // prop recess in lid
 
+prl_r1 = prop_end_dia/2 + prop_recess_slop; // radius of end
+
 prlp1 = [ lpp10[0] + prop_recess_slop + prop_end_dia/2,
          lpp10[1] + prop_recess_slop + prop_end_dia/2 ];
 
+// prop recess in case
+
+prcp2 = [ epp1[0], case_bottom_z ]; // protrusion corner
+
+prc_r2 = prop_end_dia/2 + prop_recess_slop; // radius of end
+
+prcp1_y = epp2o[1] - prop_recess_under - prc_r2;
+prcp2_x = prcp2[0] + prop_caserecess_behind + prc_r2 +
+  (prcp1_y - case_bottom_z) * prop_caserecess_taper;
+prcp2 = [ prcp1_x, prcp1_y ]; // centre of tip circle
+
+prop_recess_hw = 0.5 * prop_main_width + prop_side_gap;
+
+prop_caserecess_buildout_r = prcp2[0] - epp2o[0];
+
 // ---------- modules ----------
 
 module KeeperProfile(slant=0){
@@ -603,65 +600,6 @@ module CatchPortion(width){
     children(0);
 }
 
-module PropRecess(){
-  // origin is nonstandard
-  hwd345 = 0.5*prop_main_width + prop_side_gap;
-  hwd35  = 0.5*prop_fin_width + prop_side_gap;
-  rotate([90,0,90]){
-    linextr(-hwd345, +hwd345)
-      polygon([ prp1,
-               prp2,
-               prp3,
-               prp4,
-               prp4 + [0,10],
-               prp1 + [0,10],
-               ]);
-    linextr(-hwd35, +hwd35)
-      polygon([ prp1,
-               prp3,
-               prp5,
-               prp5 + [0,10],
-               prp1 + [0,10],
-               ]);
-  }
-}
-
-module SomePropProfile(gamma){
-// prop-internal
-  pip1 = [0,0];
-  pip2 = [ 0.5 * (prop_main_th - prop_end_dia),
-          prop_taper_len ];
-  
-  translate(prlp1) {
-    circleat([0,0], prop_end_dia/2);
-    cirecleat(pip2, prop_main_th);
-    
-  }
-}
-
-module CasePropRecess(pas) {
-  // destructure entry in prop_angle_specs
-  beta =                 pas[0];
-  b    = prop_lengths  [ pas[1] ];
-  p    = prop_lid_posns[ pas[2]] ;
-
-  k = hp_k;
-  x = k / (2 * sin(beta/2)) - hppT[0];
-  c = p + x;
-
-  // https://en.wikipedia.org/wiki/Solution_of_triangles#Two_sides_and_non-included_angle_given_(SSA) [25.1.18]
-  // we always want the positive solution because it has a closer to c
-  a = c * cos(beta) + sqrt( b*b - pow(c * sin(beta),2) );
-  q = a - x;
-
-  echo(beta, a, b, c);
-
-  Flip_bot(1)
-    translate([ phone_width/2, -q, case_bottom_z ])
-    rotate([0,180,0])
-    PropRecess();
-}
-
 module CaseBase(){
   AroundEdges(epp3[1], case_th_bottom, 1)
     EdgeProfile();
@@ -730,6 +668,15 @@ module Case(){ ////toplevel
            linear_extrude(height= 20)
            ButtonPlan($button_l, 1,1);
         }
+      
+      // buildout for prop recess
+      Flip_rhs(1)
+       linextr(-case_th_bottom, epp2i)
+       hull() {
+         for (dxs = [-1,+1])
+           circleat([ prop_x_pos + dxs * prop_caserecess_buildout_r,
+                      epp2o[0] ]);
+        }
     }
 
     // apertures along top edge
@@ -756,9 +703,17 @@ module Case(){ ////toplevel
     CatchPortion(catch_width + catch_side_gap*2)
       CatchCutProfile();
 
-    // prop recesses
-    #for (pas = prop_angle_specs)
-      CasePropRecess(pas);
+    // prop recess
+    Flip_rhs(1)
+      translate([0,0,x])
+      rotate([90,0,90])
+      linextr(-prop_recess_hw, +prop_recess_hw)
+      hull(){
+        for (zs=[ -1,0,+1 ])
+         circleat(prcp2 + 20*(abs(zs) * [0,-1] +
+                              zs * [1,0] * prop_caserecess_taper),
+                  pr_r2);
+      }
   }
 }
 
@@ -793,12 +748,6 @@ module Lid(){ ////toplevel
 
     // screw holes in the hinge arms
     HingeScrews();
-
-    // prop recesses
-    Flip_bot(1)
-      for (y = prop_lid_posns)
-       translate([ phone_width/2, -y, lpp13[1] ])
-         PropRecess();
   }
 }