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// Spur Gears
// Catarina Mota
// catarinamfmota@gmail.com
// 20091122
// License: CC-by-sa
//GEAR PARAMETERS
gearHeight=5; //gear depth
pitchDiam=45; //pitch diameter
shaftDiam=5; //shaft diameter
//TEETH PARAMETERS
teethNum=30; //number of teeth (int)
addendum=2;
dedendum=2;
toothWidth=2;
//involute gear (work in progress)
involute=0; //int: 0=no, 1=yes
pressAngle=5; //pressure angle
//CENTER SHAPE PARAMETERS
centerShape=1; //int: solid=1, star=2, circle=3
starNum=6; //number of lines for star shape (int)
starWidth=2; //width of star lines
circleNum=7; //number of circles (int)
circleDiam=7; //diameter of circles
//CENTER CIRCLE PARAMETERS
extrudeOut=1; //int: 0=no, 1=yes
extrudeOutHeight=5;
extrudeOutWidth=5; //in relationship to shaft
extrudeIn=0; //int: 0=no, 1=yes
extrudeInDiam=pitchDiam/2-dedendum*2;
extrudeInHeight=2.5;
//ROME (extrudeIn must be set to 0)
rome=1; //int: 0=no, 1=yes
romeDiam=pitchDiam/2; //pitch diameter for top gear
romeHeight=gearHeight; //top gear height
romeTeeth=romeDiam*2/3;
romeAdd=2; //top gear addendum
romeDed=2; //top gear dedendum
romeToothWidth=2; //teeth width for top gear
romeAngle=5; //rotate top gear (angle)
//----------------------
gear();
//----------------------
//TOOTH
module tooth(heightGear, diamPitch) {
toothHeight=addendum+dedendum*2;
if (involute == 1) {
translate([0,toothHeight/2,0]) involute(heightGear, toothHeight);
}
if (involute == 0) {
translate([0,toothHeight/2,0]) box(toothWidth,toothHeight,heightGear);
}
}
//INVOLUTE
module involute(heightGear, toothHeight) {
difference() {
box(toothWidth,toothHeight,heightGear);
translate([toothWidth/2,-toothHeight/2+dedendum*2,0]) {
rotate([0,0,pressAngle]) dislocateBoxRight(toothWidth, toothHeight, heightGear);
}
translate([-toothWidth/2,-toothHeight/2+dedendum*2,0]) {
rotate([0,0,-pressAngle]) dislocateBoxLeft(toothWidth, toothHeight, heightGear);
}
}
}
//SPUR
module spur(numTeeth, diamPitch, heightGear) {
rootRad=diamPitch/2-dedendum;
for (i = [1:numTeeth]) {
translate([sin(360*i/numTeeth)*(rootRad-dedendum), cos(360*i/numTeeth)*(rootRad-dedendum), 0 ]){
rotate([0,0,-360*i/numTeeth]) tooth(heightGear, diamPitch);
}
}
}
//SOLID
module solid(heightGear, diamPitch) {
rootRad=diamPitch/2-dedendum;
cylinder(heightGear, rootRad, rootRad);
}
//STAR
module star() {
starAngle=360/starNum;
union(){
for (s=[1:starNum]){
translate([0,0,gearHeight/2]){
rotate([0, 0, s*starAngle]) dislocateBox(starWidth, (pitchDiam/2-dedendum*2)/2, gearHeight);
}
}
tube(gearHeight, pitchDiam/2-dedendum, starWidth);
tube(gearHeight, pitchDiam/4+dedendum, starWidth);
//cylinder(gearHeight, pitchDiam/4+dedendum, pitchDiam/4+dedendum);
cylinder(gearHeight, shaftDiam/2+starWidth, shaftDiam/2+starWidth);
}
}
//CIRCLE
module circle() {
rootRad=pitchDiam/2-dedendum;
difference(){
solid(gearHeight, pitchDiam);
for (c=[1:circleNum]){
translate([sin(360*c/circleNum)*(rootRad/2+shaftDiam/2), cos(360*c/circleNum)*(rootRad/2+shaftDiam/2), 0]){
cylinder(gearHeight, circleDiam/2, circleDiam/2);
}
}
}
}
//ROME
module romeGear(){
translate([0,0,romeHeight/2+gearHeight]){
rotate([0,0,romeAngle]){
union(){
spur(romeTeeth, romeDiam, romeHeight);
translate ([0,0,-romeHeight/2]) solid(romeHeight, romeDiam);
}
}
}
}
//GEAR
module gear(){
difference () {
union() {
translate([0,0,gearHeight/2]) spur(teethNum, pitchDiam, gearHeight);
if (centerShape==1) solid(gearHeight, pitchDiam);
if (centerShape==2) star();
if (centerShape==3) circle();
//extrudeOut around shaft
if (extrudeOut==1) {
cylinder(gearHeight-(extrudeInHeight*extrudeIn)+extrudeOutHeight+romeHeight*rome, extrudeOutWidth/2+shaftDiam/2, extrudeOutWidth/2+shaftDiam/2);
}
if (rome==1){
romeGear();
}
}
//extrudeIn around shaft
if (extrudeIn==1) {
difference(){
translate([0,0,gearHeight-extrudeInHeight]) cylinder(extrudeInHeight, extrudeInDiam, extrudeInDiam);
cylinder(gearHeight+extrudeOutHeight, (extrudeOutWidth+shaftDiam)/2*extrudeOut, (extrudeOutWidth+shaftDiam)/2*extrudeOut);
}
}
//shaft
cylinder(gearHeight+extrudeOutHeight+romeHeight, shaftDiam/2, shaftDiam/2);
}
}
//----------------------
//SILLY WAY TO GET AROUND ROTATION AXIS
module dislocateBox(xBox, yBox, zBox){
translate([0,yBox,0]){
difference(){
box(xBox, yBox*2, zBox);
translate([-xBox,0,0]) box(xBox, yBox*2, zBox);
}
}
}
module dislocateBoxRight(xBox, yBox, zBox){
translate([xBox/2,yBox,0]){
difference(){
translate([0,-yBox/2,0]) box(xBox, yBox, zBox);
translate([-xBox,-yBox/2,0]) box(xBox, yBox, zBox);
}
}
}
module dislocateBoxLeft(xBox, yBox, zBox){
translate([xBox/2,yBox,0]){
difference(){
translate([-xBox,-yBox/2,0]) box(xBox, yBox, zBox);
translate([0,-yBox/2,0]) box(xBox, yBox, zBox);
}
}
}
//----------------------
module box(xBox, yBox, zBox) {
scale ([xBox, yBox, zBox]) cube(1, true);
}
module cone(height, radius) {
cylinder(height, radius, 0);
}
module oval(xOval, yOval, zOval) {
scale ([xOval/100, yOval/100, 1]) cylinder(zOval, 50, 50);
}
module tube(height, radius, wall) {
difference(){
cylinder(height, radius, radius);
cylinder(height, radius-wall, radius-wall);
}
}
module hexagon(height, depth) {
boxWidth=height/1.75;
union(){
box(boxWidth, height, depth);
rotate([0,0,60]) box(boxWidth, height, depth);
rotate([0,0,-60]) box(boxWidth, height, depth);
}
}
module octagon(height, depth) {
intersection(){
box(height, height, depth);
rotate([0,0,45]) box(height, height, depth);
}
}
module dodecagon(height, depth) {
intersection(){
hexagon(height, depth);
rotate([0,0,90]) hexagon(height, depth);
}
}
module hexagram(height, depth) {
boxWidth=height/1.75;
intersection(){
box(height, boxWidth, depth);
rotate([0,0,60]) box(height, boxWidth, depth);
}
intersection(){
box(height, boxWidth, depth);
rotate([0,0,-60]) box(height, boxWidth, depth);
}
intersection(){
rotate([0,0,60]) box(height, boxWidth, depth);
rotate([0,0,-60]) box(height, boxWidth, depth);
}
}
module rightTriangle(adjacent, opposite, depth) {
difference(){
translate([-adjacent/2,opposite/2,0]) box(adjacent, opposite, depth);
translate([-adjacent,0,0]){
rotate([0,0,atan(opposite/adjacent)]) dislocateBox(adjacent*2, opposite, depth);
}
}
}
module equiTriangle(side, depth) {
difference(){
translate([-side/2,side/2,0]) box(side, side, depth);
rotate([0,0,30]) dislocateBox(side*2, side, depth);
translate([-side,0,0]){
rotate([0,0,60]) dislocateBox(side*2, side, depth);
}
}
}
module 12ptStar(height, depth) {
starNum=3;
starAngle=360/starNum;
for (s=[1:starNum]){
rotate([0, 0, s*starAngle]) box(height, height, depth);
}
}
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