another: thicker shell to support spring nut

1 files changed, 5 insertions, 5 deletions

diff --git a/another.scad b/another.scad
index 7d2dfb3..efc553d 100644
--- a/another.scad
+++ b/another.scad
@@ -13,49 +13,49 @@ module the_extruder(
  mounthole_depth = 5,
  protrusion_d = 22, protrusion_h = 2.2,		// the dimensions of the protrusion on top of gearbox
  bore_d = 8, bore_l = 17.6,
  bore_dd = 7,
  // pulley properties
  pulley_d = 11.5, pulley_h=10,
  pulley_elevation = 1,				// pulley elevation above the protrusion
  teeth_elevation = 7.5,				// distance from the bottom of the pulley to its teeth
  // idler properties
  idler_d = 9.5, idler_h = 4, idler_id = 3,	// idler dimensions: outer and inner diameters and height
  // spring properties
  spring_d = 10, spring_lc = 9.6,		// spring diameter and compressed length
  // filament path properties
  filament_d = 1.75,
  filament_path_d = 2,
  filament_guide_d = 4,				// PTFE filament guide diameter
  // knob properties
  knob_h = 10,
  knob_bore_l = 4,
  knob_indent_d = 4,
  knob_indents = 12,
  // spring tensioner
  st_nut_d = 9, st_nut_h = 4,
  st_screw_d = 5,
- st_shell = 4*extrusion_width,
+ st_thickshell = 8*extrusion_width, st_thinshell = 4*extrusion_width,
 
  // screw it
  mount_screw_d = 3.1, mount_screw_l = 20,
  mount_screwhead_d=6, mount_screwhead_h=3,
 
  pf = pushfit_embeddest,
 
  // empty spaces
  idler_travel = 3,				// how far should idler travel when pressed
  idler_clearance=1,
  pulley_clearance=2,
  lever_v_clearance=.7,				// vertical clearance for the lever
  spring_d_clearance=1,
  protrusion_tolerance_h=.5,			// horizontal tolerance for the motor protrusion
  protrusion_tolerance_v=.5,			// vertical tolerance for the motor protrusion
  mount_screw_d_tolerance=.4,
  idler_v_tolerance=.5,
  knob_bore_d_tolerance=.6,
 
  what="lever",  // lever|body|knob|springpad|*
  left=false,
  vitamins = true,
  supports = false,
  tensioner = true,
@@ -188,59 +188,59 @@ module the_extruder(
  module body() {
   difference() {
    union() {
    cylinder(d=gearbox_d,h=body_h,$fn=fnd*gearbox_d);
     // finger and spring support
     fsw = gearbox_d-(gearbox_d-mount_d)/2-spring_lc;
     translate([-gearbox_d/2,0,0]) difference() {
      union() {
       hull() {
        translate([0,-longwing,ls_z])
        rotate([0,90,0])
        cylinder(d=lever_thickness,h=fsw,$fn=fnd*lever_thickness);
        hh=body_h-ls_z;
        translate([0,0,ls_z-lever_thickness/2])
        mirror([0,1,0]) cube(size=[fsw,longwing-hh+lever_thickness/sqrt(2),hh+lever_thickness/2]);
        hhh=ls_z;
        translate([0,0,0])
        mirror([0,1,0]) cube(size=[fsw,longwing-hhh+lever_thickness/sqrt(2),hhh+lever_thickness/2]);
       }
      }
      translate([0,-longwing,ls_z]) rotate([0,-90,0]) {
       if(!tensioner) finger_indent(d=lever_thickness-1,r=15); else {
        if(debug) translate([0,-lever_thickness/2-1,-gearbox_d]) cube(size=[body_h/2+1,lever_thickness/2+1,gearbox_d+2]);
        mirror([0,0,1]) {
-	translate([0,0,st_shell])
+	translate([0,0,st_thickshell])
 	hull() for(o=[0,spring_d]) translate([0,-o,0])
 	rotate([0,0,30])
 	cylinder(d=st_nut_d,h=st_nut_h,$fn=6);
 	translate([0,0,-1]) cylinder(d=st_screw_d,h=fsw+2,$fn=fnd*st_screw_d);
 	bigd = spring_d+spring_d_clearance;
 	hf = (bigd-st_screw_d)/2;
-	translate([0,0,st_shell+st_nut_h+st_shell-epsilon])
+	translate([0,0,st_thickshell+st_nut_h+st_thinshell-epsilon])
 	cylinder(d1=st_screw_d,d2=bigd,
 	 h=hf+epsilon, $fn=fnd*bigd);
-	translate([0,0,st_shell+st_nut_h+st_shell+hf-epsilon])
+	translate([0,0,st_thickshell+st_nut_h+st_thinshell+hf-epsilon])
 	cylinder(d=bigd,h=fsw+1,$fn=fnd*bigd);
        }
       }
      }
     } // translate
     
     // pushfit bracket
     translate([0,0,filament_elevation])
     rotate([0,0,45]) translate([pulley_d/2,0,0])
     rotate([-90,0,0])
     translate([0,0,mount_d/sqrt(2)/2+mount_screw_d-gearbox_d/2/*TODO:*/])
     cylinder(r=min(body_h-filament_elevation,filament_elevation)/sin(60)-epsilon,h=pf_h(pf)+gearbox_d/2/*TODO:*/,$fn=6);
    }//union (first child of difference)
 
    // protrusion
    translate([0,0,-1])
    cylinder(d=protrusion_d+protrusion_tolerance_h,h=protrusion_h+protrusion_tolerance_v+1,$fn=fnd*(protrusion_d+protrusion_tolerance_h));
    // mount screw holes
    for(zr=[0:90:359]) rotate([0,0,zr]) translate([mount_d/2,0,0]) {
     translate([0,0,mount_screw_l-mounthole_depth/2-layer_height-1])
     mirror([0,0,1])
     cylinder(d=mount_screw_d+mount_screw_d_tolerance,
              h=mount_screw_l-mounthole_depth/2-layer_height+1,
 	     $fn=fnd*(mount_screw_d+mount_screw_d_tolerance));
@@ -314,49 +314,49 @@ module the_extruder(
    difference() {
     translate([0,0,ls_z-ls_h/2-epsilon])
     cylinder(d=gearbox_d,h=ls_h+2*epsilon,$fn=fnd*gearbox_d);
     cylinder(d=pulley_d+pulley_clearance,h=body_h+1,$fn=fnd*(pulley_d+pulley_clearance));
    }
    // supports
    // TODO: hardcoded stuff below…
    if(false) { // parallel
     for(y=[-gearbox_d:4:gearbox_d])
      translate([0,y-extrusion_width/2,0])
      cube(size=[gearbox_d,extrusion_width,body_h]);
    }else{ // radial
     for(zr=[-65:(65+50)/7:50])
      rotate([0,0,zr]) translate([0,-extrusion_width/2,0])
      cube(size=[gearbox_d,extrusion_width,body_h]);
    }
   }
 
  }//body module
 
  module springpad() {
   smalld=st_screw_d+2*extrusion_width;
   bigd = spring_d+spring_d_clearance/2;
   hf = (bigd-smalld)/2;
-  translate([-gearbox_d/2+st_shell+st_nut_h+st_shell+smalld,-longwing,filament_elevation])
+  translate([-gearbox_d/2+st_thickshell+st_nut_h+st_thinshell+1,-longwing,filament_elevation])
   rotate([0,90,0]) difference() {
    union() {
     cylinder(d1=smalld,d2=bigd,h=hf,$fn=fnd*bigd);
     translate([0,0,hf-epsilon])
     cylinder(d=bigd,h=hf*2,$fn=fnd*bigd);
     translate([0,0,3*hf])
     sphere(d=spring_d*3/4,$fn=fnd*spring_d*3/4);
    }
    translate([0,0,-epsilon])
    cylinder(d=st_screw_d,h=2*hf+epsilon,$fn=fnd*st_screw_d);
   }
  }
 
  module knob() {
   ch = knob_indent_d/2;
   translate([0,0,body_h+epsilon]) {
    mirror([0,0,1]) translate([0,0,-epsilon]) {
     difference() {
      cylinder(d=pulley_d,h=knob_bore_l,$fn=fnd*pulley_d);
      translate([0,0,-1]) difference() {
       cylinder(d=bore_d+knob_bore_d_tolerance,h=knob_bore_l+2);
       translate([-bore_d/2-1,bore_dd-bore_d/2+knob_bore_d_tolerance/2,-1])
       cube([bore_d+2,bore_d/2,knob_bore_l+4]);
      }