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Merge pull request SolidCode#9 from TomHodson/master
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added a root rounding option to involute_gears
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@McNeight
McNeight committed Mar 31, 2014
2 parents 6621a9b + 9c458c5 commit 5efe18f
Showing 1 changed file with 83 additions and 26 deletions.
109 changes: 83 additions & 26 deletions involute_gears.scad
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Original file line number Diff line number Diff line change
Expand Up @@ -4,11 +4,26 @@
// http://www.thingiverse.com/thing:3575 and http://www.thingiverse.com/thing:3752

// Simple Test:
//gear (circular_pitch=700,
// gear_thickness = 12,
// rim_thickness = 15,
// hub_thickness = 17,
// circles=8);
gear (
number_of_teeth = 30,
circular_pitch=700,
gear_thickness = 12,
rim_thickness = 15,
hub_thickness = 17,
circles=8,
roundsize = 0
);

translate([100,0,0])
gear (
number_of_teeth = 30,
circular_pitch=700,
gear_thickness = 12,
rim_thickness = 15,
hub_thickness = 17,
circles=8,
roundsize = 1
);

//Complex Spur Gear Test:
//test_gears ();
Expand Down Expand Up @@ -293,6 +308,8 @@ module involute_bevel_gear_tooth (
}
}



module gear (
number_of_teeth=15,
circular_pitch=false, diametral_pitch=false,
Expand All @@ -308,7 +325,9 @@ module gear (
backlash=0,
twist=0,
involute_facets=0,
flat=false)
flat=false,
roundsize = 1
)
{
if (circular_pitch==false && diametral_pitch==false)
echo("MCAD ERROR: gear module needs either a diametral_pitch or circular_pitch");
Expand Down Expand Up @@ -353,13 +372,12 @@ module gear (
min (
0.70*circle_orbit_curcumference/circles,
(rim_radius-hub_diameter/2)*0.9);

//render()
difference()
{
union ()
union()
{
difference ()
{

linear_exturde_flat_option(flat=flat, height=rim_thickness, convexity=10, twist=twist)
gear_shape (
number_of_teeth,
Expand All @@ -370,10 +388,6 @@ module gear (
half_thick_angle = half_thick_angle,
involute_facets=involute_facets);

if (gear_thickness < rim_thickness)
translate ([0,0,gear_thickness])
cylinder (r=rim_radius,h=rim_thickness-gear_thickness+1);
}
if (gear_thickness > rim_thickness)
linear_exturde_flat_option(flat=flat, height=gear_thickness)
circle (r=rim_radius);
Expand All @@ -382,16 +396,54 @@ module gear (
linear_exturde_flat_option(flat=flat, height=hub_thickness-gear_thickness)
circle (r=hub_diameter/2);
}
translate ([0,0,-1])
linear_exturde_flat_option(flat =flat, height=2+max(rim_thickness,hub_thickness,gear_thickness))
circle (r=bore_diameter/2);
if (circles>0)
{
render() {
if(roundsize > 0) {
if(number_of_teeth % 4 == 0) {
for(i=[1:number_of_teeth]) {
rotate([0,0,(i+0.5)*(360/number_of_teeth) - (half_thick_angle*0)])
translate([0,root_radius,-50])
cylinder(r=((360/number_of_teeth - half_thick_angle)/360) * pi*root_radius/2 * roundsize, h = 100, $fn = 20);
}
}
if(number_of_teeth % 4 == 1) {
for(i=[1:number_of_teeth]) {
rotate([0,0,(i+0.5)*(360/number_of_teeth) - (half_thick_angle)])
translate([0,root_radius,-50])
cylinder(r=((360/number_of_teeth - half_thick_angle)/360) * pi*root_radius/2 * roundsize, h = 100, $fn = 20);
}
}
if(number_of_teeth % 4 == 2) {
for(i=[1:number_of_teeth]) {
rotate([0,0,(i)*(360/number_of_teeth) + (half_thick_angle*0)])
translate([0,root_radius,-50])
cylinder(r=((360/number_of_teeth - half_thick_angle)/360) * pi*root_radius/2 * roundsize, h = 100, $fn = 20);
}
}
if(number_of_teeth % 4 == 3) {
for(i=[1:number_of_teeth]) {
rotate([0,0,(i)*(360/number_of_teeth) - (half_thick_angle)])
translate([0,root_radius,-50])
cylinder(r=((360/number_of_teeth - half_thick_angle)/360) * pi*root_radius/2 * roundsize, h = 100, $fn = 20);
}
}
}

if (gear_thickness < rim_thickness)
translate ([0,0,gear_thickness])
cylinder (r=rim_radius,h=rim_thickness-gear_thickness+1);

translate ([0,0,-1])
linear_exturde_flat_option(flat =flat, height=2+max(rim_thickness,hub_thickness,gear_thickness))
circle (r=bore_diameter/2);

if (circles>0)
{
for(i=[0:circles-1])
rotate([0,0,i*360/circles])
translate([circle_orbit_diameter/2,0,-1])
linear_exturde_flat_option(flat =flat, height=max(gear_thickness,rim_thickness)+3)
circle(r=circle_diameter/2);
}
}
}
}
Expand All @@ -409,6 +461,7 @@ module linear_exturde_flat_option(flat =false, height = 10, center = false, conv

}


module gear_shape (
number_of_teeth,
pitch_radius,
Expand All @@ -418,12 +471,15 @@ module gear_shape (
half_thick_angle,
involute_facets)
{


union()
{
rotate (half_thick_angle) circle ($fn=number_of_teeth*2, r=root_radius);

for (i = [1:number_of_teeth])
{

rotate ([0,0,i*360/number_of_teeth])
{
involute_gear_tooth (
Expand All @@ -438,6 +494,7 @@ module gear_shape (
}
}


module involute_gear_tooth (
pitch_radius,
root_radius,
Expand Down Expand Up @@ -520,14 +577,14 @@ module test_gears()
{
translate([17,-15])
{
gear (number_of_teeth=17,
#gear (number_of_teeth=17,
circular_pitch=500,
circles=8);

rotate ([0,0,360*4/17])
translate ([39.088888,0,0])
{
gear (number_of_teeth=11,
#gear (number_of_teeth=11,
circular_pitch=500,
hub_diameter=0,
rim_width=65);
Expand All @@ -539,7 +596,7 @@ module test_gears()
rim_width=5,
rim_thickness=6,
pressure_angle=31);
rotate ([0,0,360*5/6])
#rotate ([0,0,360*5/6])
translate ([22.5,0,1])
gear (number_of_teeth=21,
circular_pitch=300,
Expand All @@ -555,7 +612,7 @@ module test_gears()

translate ([-61.1111111,0,0])
{
gear (number_of_teeth=27,
#gear (number_of_teeth=27,
circular_pitch=500,
circles=5,
hub_diameter=2*8.88888889);
Expand All @@ -573,7 +630,7 @@ module test_gears()
bore_diameter=5,
circles=0);
translate ([13.8888888,0,1])
gear (
#gear (
number_of_teeth=11,
circular_pitch=200,
pressure_angle=5,
Expand All @@ -590,7 +647,7 @@ module test_gears()

rotate ([0,0,360*-5/17])
translate ([44.444444444,0,0])
gear (number_of_teeth=15,
#gear (number_of_teeth=15,
circular_pitch=500,
hub_diameter=10,
rim_width=5,
Expand All @@ -601,7 +658,7 @@ module test_gears()

rotate ([0,0,360*-1/17])
translate ([30.5555555,0,-1])
gear (number_of_teeth=5,
#gear (number_of_teeth=5,
circular_pitch=500,
hub_diameter=0,
rim_width=5,
Expand Down

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