fairphone-case: wip new prop

[reprap-play.git] / fairphone-case.scad

diff --git a/fairphone-case.scad b/fairphone-case.scad
index 13b26585a6f02da9ecf75056dff5be2b3888ec2f..01796a134896a9d53289f51b7f635abdb286555b 100644 (file)
--- a/fairphone-case.scad
+++ b/fairphone-case.scad
@@ -4,6 +4,18 @@ 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 ],
+  ];
+
 bumper = [ 0.250, -0.025 ];
 // ^ One side.  Overall size is increased by twice this.
 // If no bumpers, is the gap around the phone.
@@ -67,7 +79,7 @@ lid_gap_x = 0.25;
 lid_gap_z = 0.25;
 lid_lip = 1.75;
 
-catch_slop = 0.25;
+catch_slop = 0.50;
 
 foldover_gap = 0.50;
 foldover_lever_gap = 0.50;
@@ -96,7 +108,7 @@ hinge_x_postscrew_gap = 0.75;
 hinge_x_arms_gap = 0.35;
 hinge_r_arms_gap = 0.55;
 
-rearspeaker_gap    = [ 1.0, 1.0 ]; // each side
+rearspeaker_gap    = [ 2.0, 2.0 ]; // each side
 
 catch_len = 7.5;
 catch_width = 15;
@@ -108,6 +120,21 @@ 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_end_dia = 0.5;
+prop_main_th = 3;
+prop_taper_len = 6;
+
 // ---------- calculated ----------
 
 phone_width =  (phone + bumper*2)[0];
@@ -124,6 +151,11 @@ lid_buttoncover_overlap = case_th_lip + keeper_gap_z_top;
 
 phone_backside_slope_thick = phone_total_thick - phone_edge_thick;
 
+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
 
@@ -197,8 +229,8 @@ hex22 = hex21 + hinge_x_gap;
 hex23 = hex22 + hingescrew_portion_len
   - hingescrew_nut_thick; // bodge, need to divvy this up more sensibly
 hex24 = hex20 + hingescrew_shaft_len + hinge_x_postscrew_gap;
-echo(hex20, hex21, hex22, hex23, hex24);
-echo(hingescrew_portion_len);
+//echo(hex20, hex21, hex22, hex23, hex24);
+//echo(hingescrew_portion_len);
 
 // catch
 
@@ -221,6 +253,19 @@ 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
+
+prlp1 = [ lpp10[0] + prop_recess_slop + prop_end_dia/2,
+         lpp10[1] + prop_recess_slop + prop_end_dia/2 ];
+
 // ---------- modules ----------
 
 module KeeperProfile(slant=0){
@@ -556,6 +601,65 @@ 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, epp2o[1]-case_th_bottom ])
+    rotate([0,180,0])
+    PropRecess();
+}
+
 module CaseBase(){
   AroundEdges(epp3[1], case_th_bottom, 1)
     EdgeProfile();
@@ -649,6 +753,10 @@ module Case(){ ////toplevel
     // catch striker
     CatchPortion(catch_width + catch_side_gap*2)
       CatchCutProfile();
+
+    // prop recesses
+    #for (pas = prop_angle_specs)
+      CasePropRecess(pas);
   }
 }
 
@@ -683,6 +791,12 @@ 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();
   }
 }
 
@@ -811,6 +925,19 @@ module LidPrint(){ ////toplevel
     Lid();
 }
 
+module TestSelectPropRecesses(posns){
+  linextr(-100,100){
+    translate([phone_width/2, -phone_height]){
+      square([ 3, 500 ], center=true);
+      for (y=posns)
+       hull()
+         for (dy=[ -prp5[0], -prp2[0] ])
+           translate([0,y+dy])
+             square([prop_main_width+5, 5], center=true);
+    }
+  }
+}
+
 module TestSelectFrame(){
   include = [1,-1] * (epp2i[0] + 4);
 
@@ -822,6 +949,11 @@ module TestSelectFrame(){
   }
 }
 
+module TestSelectLidFrame(){
+  TestSelectFrame();
+  TestSelectPropRecesses(prop_lid_posns);
+}
+
 module TestFrameCase(){ ////toplevel
   intersection(){
     Case();
@@ -836,7 +968,7 @@ module TestFrameCase(){ ////toplevel
 module TestFrameLidPrint(){ ////toplevel
   rotate([0,180,0]) intersection(){
     Lid();
-    TestSelectFrame();
+    TestSelectLidFrame();
   }
 }
 
@@ -864,7 +996,7 @@ module HingeScrews(){
 
 module DemoFrame(){ ////toplevel
   color("red") TestFrameCase();
-  color("blue") intersection(){ Lid(); TestSelectFrame(); }
+  color("blue") intersection(){ Lid(); TestSelectLidFrame(); }
   color("black") HingeScrews();
   %HingeLever();
 }
@@ -872,7 +1004,7 @@ module DemoFrame(){ ////toplevel
 module DemoHingedFrame(){ ///toplevel
   color("red") TestFrameCase();
   translate([0,0, -2*hp_k])
-  color("blue") intersection(){ Lid(); TestSelectFrame(); }
+  color("blue") intersection(){ Lid(); TestSelectLidFrame(); }
 
   Flip_hinge(){
     color("orange") HingeLever();
@@ -937,3 +1069,4 @@ module DemoProfiles(){ ////toplevel
 //LidEdgeProfile();
 //KeeperProfile();
 //DemoProfiles();
+//PropRecess();