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gregs-spool.scad
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gregs-spool.scad
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/*
* Filament Spool
* by Greg Frost.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
*/
use<Libs.scad>
num_balls=9;
ball_diameter=8;
ball_separation=0.01;
bearing_slop=0.5;
bearing_support_thickness=5;
bearing_gap=1.5;
shaft_diameter=8;
dovetail_height=8;
dovetail_width=9;
arm_width=15;
arm_stub_length=12;
slot_width=9.4;
ball_facets=20;
bearing_facets=80;
shaft_facets=15;
ball_translation=((ball_diameter+ball_separation)/2)/sin(180/num_balls);
race_inside_height=ball_diameter+bearing_slop;
race_outside_height=race_inside_height+bearing_support_thickness;
race_radius=ball_translation+ball_diameter/2+bearing_slop/2+bearing_support_thickness;
race_inside_radius=ball_translation+ball_diameter/3;
//bushing_race ();
//cross_piece();
//translate([0,(arm_width+2),0])
//spoke();
//race ();
//hub();
//translate((race_radius+race_inside_radius)/sqrt(2)*[-1,-1,0])
//hub();
//
//translate([-40,10])
//rotate(30)
//balls();
//for(i=[-1:-3])
//translate([0,i*(arm_width+2),0])
//cross_piece();
//
//for(i=[0:5])
//translate([0,i*(arm_width+2),0])
//spoke();
//test_dovetail ();
race_for_viks();
module test_dovetail ()
{
dovetail(height=dovetail_height,width=dovetail_width,male=false);
translate([0,2*dovetail_width,0])
difference ()
{
translate([0.5*dovetail_width,0,0])
cube([dovetail_width,dovetail_width*1.5,dovetail_height],center=true);
dovetail(height=dovetail_height+2,width=dovetail_width+0.5,male=false);
}
}
module balls()
{
for(i=[0:5])
for(j=[0:2])
translate([i*(ball_diameter+2),j*(ball_diameter+2),0])
ball();
}
module ball()
{
difference()
{
sphere(r=ball_diameter/2,$fn=ball_facets);
translate([0,0,-ball_diameter/2])
cube([ball_diameter+1,ball_diameter+1,ball_diameter],center=true);
}
}
module race()
{
translate([0,0,race_outside_height/2])
difference()
{
render();
difference()
{
cylinder(r=race_radius,h=race_outside_height,center=true,$fn=bearing_facets);
cylinder(r=race_inside_radius,h=race_outside_height+2,center=true,$fn=bearing_facets);
}
raceway();
}
for(arm=[0:2])
rotate(arm*360/3)
translate([0,0,dovetail_height/2])
difference()
{
translate([-ball_translation-ball_diameter/2-bearing_slop-arm_stub_length/2,0,0])
cube([arm_stub_length,arm_width,dovetail_height],center=true);
translate([-ball_translation-ball_diameter/2-bearing_slop-arm_stub_length,0,0])
dovetail(height=dovetail_height+2,width=dovetail_width+0.5,male=false);
}
}
module race_for_viks()
{
arm_stub_length=53;
difference()
{
union()
{
render()
translate([0,0,dovetail_height/4])
difference()
{
cylinder(r=race_radius*1.5,h=dovetail_height/2,center=true,$fn=bearing_facets);
cylinder(r=race_radius*1.5-7,h=dovetail_height+2,center=true,$fn=bearing_facets);
}
for(arm=[0:2])
rotate(arm*360/3)
{
translate([-arm_stub_length/2,0,dovetail_height/2])
cube([arm_stub_length,arm_width,dovetail_height],center=true);
render()intersection()
{
translate([-50,-arm_width/2,0])
cube([10,arm_width,race_outside_height]);
translate([0,0,-1])
cylinder(r=50,h=20,$fn=200);
}
}
}
translate([0,0,dovetail_height/2])
cylinder(r=9/2,h=dovetail_height+2,center=true,$fn=20);
}
}
module bushing_race()
{
bushing_inner_diameter=21.5;
bushing_clearance=0.5;
bushing_support_thickness=5;
difference ()
{
union()
{
cylinder(r1=bushing_inner_diameter/2+(dovetail_height/2)*cos(60),
r2=bushing_inner_diameter/2,
h=dovetail_height/2,$fn=bearing_facets);
translate([0,0,dovetail_height/2])
cylinder(r2=bushing_inner_diameter/2+(dovetail_height/2)*cos(60),
r1=bushing_inner_diameter/2,
h=dovetail_height/2,$fn=bearing_facets);
}
translate([0,0,-1])
cylinder(r=8/2+0.25,h=dovetail_height+2);
}
difference()
{
cylinder(r=bushing_inner_diameter/2+bushing_clearance+(dovetail_height/2)*cos(45)+bushing_support_thickness,h=dovetail_height);
cylinder(r1=bushing_inner_diameter/2+bushing_clearance+(dovetail_height/2)*cos(45),
r2=bushing_inner_diameter/2+bushing_clearance,
h=dovetail_height/2,$fn=bearing_facets);
translate([0,0,dovetail_height/2])
cylinder(r2=bushing_inner_diameter/2+bushing_clearance+(dovetail_height/2)*cos(45),
r1=bushing_inner_diameter/2+bushing_clearance,
h=dovetail_height/2,$fn=bearing_facets);
}
for(arm=[0:2])
rotate(arm*360/3)
translate([0,0,dovetail_height/2])
difference()
{
translate([-ball_translation-ball_diameter/2-bearing_slop-arm_stub_length/2,0,0])
cube([arm_stub_length,arm_width,dovetail_height],center=true);
translate([-ball_translation-ball_diameter/2-bearing_slop-arm_stub_length,0,0])
dovetail(height=dovetail_height+2,width=dovetail_width+0.5,male=false);
}
}
module hub()
{
translate([0,0,race_outside_height/2])
difference ()
{
cylinder(r=race_inside_radius-bearing_gap,h=race_outside_height,center=true,$fn=bearing_facets);
cylinder(r=shaft_diameter/2,h=race_outside_height+2,center=true,$fn=shaft_facets);
raceway();
translate([-race_inside_radius,-race_inside_radius,0])
cube([race_inside_radius*2,race_inside_radius*2,race_outside_height/2+1]);
}
}
module raceway()
{
scale([1,1,race_inside_height/ball_diameter])
{
rotate(180/bearing_facets)
rotate_extrude ($fn=bearing_facets)
{
translate([ball_translation+bearing_slop/2,0])
circle(r=ball_diameter/2,$fn=ball_facets);
translate([ball_translation-bearing_slop/2,0])
circle(r=ball_diameter/2,$fn=ball_facets);
translate([ball_translation,0])
square([bearing_slop,ball_diameter],center=true);
}
}
}
module cross_piece()
{
l=145;
difference()
{
translate([-l/2,0,0])
cube([l,arm_width,dovetail_height],true);
rotate(180)
dovetail(height=dovetail_height+2,width=dovetail_width+0.5,male=false);
translate([-l,0,0])
dovetail(height=dovetail_height+2,width=dovetail_width+0.5,male=false);
translate([-l/2,0,0])
cube([l-30,slot_width,dovetail_height+2],true);
translate([-l+15,0,0])
cylinder(r=slot_width/2,h=dovetail_height+2,center=true);
translate([-15,0,0])
cylinder(r=slot_width/2,h=dovetail_height+2,center=true);
for (i=[1:6])
translate([-l/7*i,0,0])
rotate([90,0,0])
cylinder(r=3/2-0.2,h=arm_width+2,center=true);
}
}
module spoke ()
{
l=150;
slat=105;
difference()
{
union()
{
dovetail(height=dovetail_height,width=dovetail_width,male=false);
translate([-l/2,0,0])
cube([l,arm_width,dovetail_height],true);
translate([-l,0,0])
cylinder(r=arm_width/2,h=dovetail_height,center=true);
}
translate([-l,0,0])
cylinder(r=slot_width/2,h=dovetail_height+2,center=true);
translate([-l/2+3,0,0])
cube([l-24,slot_width,dovetail_height+2],true);
translate([-l+15,0,0])
cylinder(r=slot_width/2,h=dovetail_height+2,center=true);
translate([-9,0,0])
cylinder(r=slot_width/2,h=dovetail_height+2,center=true);
for (i=[0:2])
translate([-l+16+i*9,0,0])
rotate([90,0,0])
cylinder(r=3/2-0.2,h=arm_width+2,center=true);
}
translate([-slat,0,dovetail_height/2])
rotate([0,-90,0])
{
dovetail(height=dovetail_height,width=dovetail_width,male=false);
translate([0,-arm_width/2,-3*dovetail_height/2])
cube([dovetail_height,arm_width,dovetail_width]);
translate([-dovetail_height,-arm_width/2,-3*dovetail_height/2])
cube([dovetail_height,arm_width,dovetail_width+dovetail_height]);
}
}