From cb33c94fe8264c3f689268b80e7bd767b31f72dc Mon Sep 17 00:00:00 2001
From: Michael Krelin <hacker@klever.net>
Date: Fri, 31 Aug 2018 20:19:28 +0000
Subject: another: lookup-driven filament drive puley specification

---
diff --git a/another.scad b/another.scad
index ed18874..51358ee 100644
--- a/another.scad
+++ b/another.scad
@@ -5,6 +5,7 @@ $fs=0.0125;
 
 use <pushfittery.scad>;
 include <pushfit_data.scad>;
+include <pulley_data.scad>;
 
 module the_extruder(
  // motor properties
@@ -16,10 +17,8 @@ module the_extruder(
  bore_d = 8, bore_l = 17.6,
  bore_dd = 7,
  // pulley properties
- pulley_d = 11.5, pulley_h=10,
+ pulley = pulley_e3d,
  pulley_elevation = 1,				// pulley elevation above the protrusion
- teeth_elevation = 7.5,				// distance from the bottom of the pulley to its teeth
- filament_offset = (8.25-(3.0+3.5)/2) - 11.5/2 + 1.75/2,
  // idler properties
  idler_d = 9.5, idler_h = 4, idler_id = 3,	// idler dimensions: outer and inner diameters and height
  // spring properties
@@ -52,7 +51,6 @@ module the_extruder(
  // empty spaces
  idler_travel = 3,				// how far should idler travel when pressed
  idler_clearance=1,
- pulley_d_clearance=2,
  pulley_small_d_clearance=0.5,
  lever_v_clearance=.7,				// vertical clearance for the lever
  spring_d_clearance=1,
@@ -77,7 +75,13 @@ module the_extruder(
  label = "another"
 ) {
  fnd = 2*PI; fnr = 2*fnd;
+ function lu(m,k) = m[search([k],m)[0]][1];
 
+ pulley_d = lu(pulley,"d");
+ pulley_h = lu(pulley,"h");
+ teeth_elevation = lu(pulley,"fe");
+ filament_offset = lu(pulley,"g")+filament_d/2;
+ pulley_d_clearance = lu(pulley,"ssrc")*2;
  idler_filament_offset = filament_path_d/2; // -filament_offset;
  lever_shell = mount_screwhead_h+0.5;
  lever_thickness=max(spring_d+spring_d_clearance+layer_height*8,idler_h+idler_v_tolerance+2*lever_shell);
diff --git a/pulley_data.scad b/pulley_data.scad
new file mode 100644
index 0000000..a1523de
--- a/dev/null
+++ b/pulley_data.scad
@@ -0,0 +1,8 @@
+pulley_e3d = [
+ ["d", 11.5 ],			// outer diameter
+ ["h", 11 ],			// pulley height
+ ["g", 8.25-3 - 11.5/2 ],	// depth of U-groove, filament offset from the surface
+ ["fe", 7.5 ],			// filament elevation from the bottom
+ ["ssrc", 2 ],			// set screw radial clearance
+];
+
--
cgit v0.9.0.2