From 174398de1eb4cc1361107f23956339cea5fe95f2 Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Thu, 26 Jul 2018 21:33:31 +0000
Subject: renamed multimixer to multiswitch

after all it doesn't mix anything…
---
(limited to 'multiswitch.scad')

diff --git a/multiswitch.scad b/multiswitch.scad
new file mode 100644
index 0000000..75d95e4
--- a/dev/null
+++ b/multiswitch.scad
@@ -0,0 +1,105 @@
+layer_height=.2; extrusion_width=.5;
+epsilon=.01;
+
+use <pushfittery.scad>;
+include <pushfit_data.scad>;
+
+module multiswitch(
+ liner_od = 4, liner_id = 2,
+ angle = 15,    // to the vertical (output) axis
+ inputs = 4,
+ minshell = 2*extrusion_width,
+ shell = 5*extrusion_width,
+ pf = pushfit_embeddest,
+ debug = 0,     // how many inputs -1 the debug cutout spans
+ print = true,
+
+ liner_d_tolerance=.2
+) {
+ fnd = 4*PI; fnr = 2*fnd;
+ 
+ pushfit_d = pf_d(pf);
+ pushfit_h = pf_h(pf);
+ 
+ angular_step = 360/inputs;
+ lod = liner_od+liner_d_tolerance; // effective liner diameter
+ 
+ sinsin = sin(angle)*sin(angular_step/2);
+ function l_to(d) = d*cos(asin(sinsin))/sinsin;
+ l_output = lod;
+ l_input = l_to(pushfit_d/2+minshell);
+ l_fork = l_to(liner_id/2);
+ l_narrow = l_to(lod/2+minshell);
+ 
+ module forinputs() {
+  for(zr=[0:angular_step:359]) rotate([0,0,zr]) rotate([0,angle,0]) children();
+ }//forinputs module
+ module foroutput() {
+  rotate([180,0,0]) children();
+ }
+ 
+ module laydown() {
+  r = pushfit_d/2+shell;
+  h_bottom = l_output+pushfit_h;
+  /* The top point on the cylinder that will touch the bed */
+  x0 = r*cos(angular_step/2);
+  y0 = r*sin(angular_step/2);
+  z0 = l_input+pushfit_h;
+  /* The same point after rotation by "angle" around Y axis */
+  x1 = z0*sin(angle)+x0*cos(angle);
+  y1 = y0;
+  z1 = z0*cos(angle)-x0*sin(angle);
+  ax1 = atan(y1/x1);
+  /* And its x-coordinate after final "angular_step/2" Z-rotation */
+  ax2 = ax1-angular_step/2;
+  x2 = x1*cos(ax2)/cos(ax1);
+  laydown_angle = atan((x2-r)/(z1+h_bottom));
+  rotate([90-laydown_angle,0,0])
+   translate([0,r,h_bottom])
+    rotate([0,0,angular_step/2-90])
+     children();
+ }
+ module finalize() {
+  if(print) laydown() children();
+  else children();
+ }
+
+ finalize() difference() {
+  hull() {
+   forinputs()
+    translate([0,0,l_input+pushfit_h]) mirror([0,0,1])
+    cylinder(d=pushfit_d+shell*2,h=epsilon,$fn=pushfit_d*fnd);
+   foroutput()
+    translate([0,0,l_output+pushfit_h]) {
+     cylinder(d=pushfit_d+shell*2,h=epsilon,$fn=pushfit_d*fnd);
+    }
+  }
+  forinputs() {
+   translate([0,0,l_input]) pushfit(pf);
+   translate([0,0,l_narrow]) {
+    cylinder(d=lod,h=l_input+1-l_narrow,$fn=lod*fnd);
+    mirror([0,0,1]) translate([0,0,-epsilon])
+    cylinder(d1=(liner_id+lod)/2,d2=liner_id,h=liner_id,$fn=lod*fnd);
+   }
+   cylinder(d=liner_id,h=l_input+epsilon,$fn=liner_id*fnd);
+  }
+  foroutput() {
+   translate([0,0,l_output]) pushfit(pf);
+   cylinder(d=lod,h=l_output+1,$fn=lod*fnd);
+  }
+  hull() {
+   forinputs()
+    translate([0,0,l_fork]) cylinder(d=liner_id,h=epsilon,$fn=liner_id*fnd);
+   foroutput()
+    cylinder(d=liner_id,h=epsilon,$fn=liner_id*fnd);
+  }
+  if(debug) {
+   translate([0,0,-20/*TODO:*/])
+   rotate_extrude(angle=angular_step*debug)
+   square([50,100]/*TODO:*/);
+  }
+ }
+
+}
+
+multiswitch(debug=2,print=false);
--
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