File:Internal Geneva Wheel 17.svg
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Original file (SVG file, nominally 135 × 135 pixels, file size: 11 KB)
Summary
| Description |
Deutsch: Malteserkreuzgetriebe, Inneres Stiftgetriebe |
| Date | |
| Source | Own work |
| Author | MichaelFrey |
Source Code
mechanism.scad
use <../../animation/arrow_quad.scad>;
$fn = 50;
n=4;
pinRadius = 1;
r=5;
showInput = true;
showOutput = true;
showOutputHoles =true;
showSupport = true;
showUglySupport = false;
volume =true;
arrows = true;
gap = 0.1;
opacity = 1; //[0:0.1:1]
inputShaftLength = 4;
ang = $t*360;
l2 = 1/tan(180/n)*r;
l3 = pow(l2*l2+r*r,0.5);
outputDiscRadius =l3+r+pinRadius*4;
arrowRadius = l3+r;
slotAngle = 360 / n;
slotLength = r+r*2^0.5;
module circleSeg(r1,r2,ang){
points1 = [for(i=[0:+ang/10:ang]) [r1*sin(i),r1*cos(i)]];
points2 = [for(i=[ang:-ang/10:0]) [r2*sin(i),r2*cos(i)]];
points = [each points1, each points2];
polygon(points);
}
module arrow_quad(){
ratio = 2;
r0 = 3;
r1 = r0-pinRadius/4;
r2 = r0+pinRadius/4;
r3 = r0;
headArc =30;
circleSeg(r1,r2,90-headArc);
//Arrow Head
i=90;
point1 = [(r3+pinRadius/ratio)*sin(i-headArc),(r3+pinRadius/ratio)*cos(i-headArc)];
point2 = [(r3-pinRadius/ratio)*sin(i-headArc),(r3-pinRadius/ratio)*cos(i-headArc)];
point3 = [r3*sin(i),r3*cos(i)];
points = [ point1, point2, point3];
polygon(points);
}
module slot(ang){
hull(){
translate([l2,0,0])
circle(pinRadius);
translate([l3+r,0,0])
circle(pinRadius);
}
translate([l2,r])
rotate([0,0,180])
circleSeg(r-pinRadius,r+pinRadius,180-ang);
}
module slots(n){
ang = 360/n;
for(i=[1:1:n]){
rotate([0,0,ang*i])
linear_extrude(height=1)
slot(ang);
}
}
module input(){
a= 1/tan(360/n/2)*r;
translate([r,a,0])
rotate([0,0,$t*360])
translate([0,0,-1.1])
{
translate([0,0,-3])rotate([180,0,0])
if(arrows){
linear_extrude(height=1)
{
arrow_quad();
rotate([0,0,180])
arrow_quad();
}
}
color("red",opacity)
translate([0,0,-inputShaftLength+gap*2])
cylinder(h=inputShaftLength, r=pinRadius, $fn=6);
color([1,0.5,0.5],opacity)
translate([0,0,gap/2])
hull(){
cylinder(h=1-gap, r=pinRadius-gap);
translate([r,0,0])
cylinder(h=1-gap, r=pinRadius-gap);
}
translate([r,0,0])
color("red",opacity)
cylinder(h=2, r=pinRadius);
}
}
outfn = n*6;
module outputArrow(turning){
headArc =slotAngle/8;
angus = atan2(-a,-r) + slotAngle/4 ;
angus2 = n%2==1 ? angus+slotAngle/2:angus;
rotate([0,0,-angus2+slotAngle/4 ])
rotate([0,0,-slotAngle/4 ])
{
r1 = arrowRadius-pinRadius/3;
r2 = arrowRadius+pinRadius/3;
r3 =arrowRadius;
linear_extrude(height=1)
circleSeg(r1,r2,-slotAngle/2+headArc);
//Arrow Head
i=-slotAngle/2;
point1 = [(r3+pinRadius)*sin(i+headArc),(r3+pinRadius)*cos(i+headArc)];
point2 = [(r3-pinRadius)*sin(i+headArc),(r3-pinRadius)*cos(i+headArc)];
point3 = [r3*sin(i),r3*cos(i)];
points = [ point1, point2, point3];
linear_extrude(height=1)
polygon(points);
}
}
module output(turning){
color([0,0.5,0],1)
render(convexity=5)
difference(){
cylinder(h=1,r=outputDiscRadius,$fn=outfn);
translate([0,0,-1])
scale([1,1,3])
slots(n);
if(showOutputHoles){
for(i=[1:1:n]){
S1=[a,r];
rotate([0,0,slotAngle*i])
translate(S1)
cylinder(h=1,pinRadius);
}
}
};
if(volume){
translate([0,0,1])
color([0.5,1.0,0.5],0.5)
cylinder(h=1,r=outputDiscRadius,$fn=outfn);
}
translate([0,0,2])
color([0.5,1,0.5],1)
cylinder(h=10,r=pinRadius,$fn=outfn);
color("yellow")
if(turning && arrows){
translate([0,0,10])
rotate([180,0,0])
linear_extrude(height=1)
if(arrows){
arrow_quad();
rotate([0,0,180])
arrow_quad();
}
translate([0,0,-0.5])
outputArrow(turning);
}
}
module support(){
S0=[0,0];
S1=[r,a];
S2=[r*3,a*3];
S3=[r+a*2.5,a-r*2.5];
color("blue",opacity)
translate(S1)
translate([0,0,-2-gap])
cylinder(h=1, r=pinRadius*2, $fn=60);
color([0.5,0.5,1],opacity)
translate([0,0,-2-gap+0.25])
hull(){
translate(S1)
cylinder(h=1/2, r=pinRadius, $fn=60);
//translate([outputDiscRadius,outputDiscRadius,0])
translate(S2)
cylinder(h=1/2, r=pinRadius, $fn=60);
}
color([0.5,0.5,1],opacity)
translate([0,0,-2-gap+0.25])
hull(){
translate(S1)
cylinder(h=1/2, r=pinRadius, $fn=60);
translate(S3)
cylinder(h=1/2, r=pinRadius, $fn=60);
}
color([0.5,0.5,1],opacity)
translate([0,0,-2-gap+0.25])
if(n>3)hull(){
translate(S0)
cylinder(h=1/2, r=pinRadius, $fn=60);
translate(S1)
cylinder(h=1/2, r=pinRadius, $fn=60);
}
if(n>3){
translate([0,0,-3])
translate(S0)
cylinder(h=8,r=pinRadius/2);
}
translate([0,0,-3])
translate(S2)
cylinder(h=8,r=pinRadius/2);
translate([0,0,-3])
translate(S3)
cylinder(h=8,r=pinRadius/2);
if(showUglySupport){
translate([-r,-r*2,+5])
cube([35,35,2]);
}
translate([0,0,+3])
hull(){
translate(S0)
cylinder(h=1,r=pinRadius*2);
translate(S2)
cylinder(h=1,r=pinRadius*2);
translate(S3)
cylinder(h=1,r=pinRadius*2);
}
}
a=l2;
function pinAngle(ang)= let(point = [
r + cos(ang)*r,
a + sin(ang)*r] ) atan2(point.y, point.x);
pinAngle = pinAngle(ang);
turning = ang<180 ? true : ang >270+(90-slotAngle) ? true : false;
outputAngle = turning ? pinAngle : 90;
if(volume){
if(showInput){
input();
}
if(showOutput){
rotate([0,0,outputAngle])
output(turning);
}
if(showSupport){
support();
}
}else{
if(showInput){
projection()
input();
}
projection(){
if(showOutput){
output();
}
}
}
arrow_quad.scad
$fn=50;
rotate([0,0,-$t*120]){
arrow_ring();
}
module arrow_ring(){
rotate([0,0,0])
arrow_quad();
rotate([0,0,90])
arrow_quad();
rotate([0,0,180])
arrow_quad();
rotate([0,0,270])
arrow_quad();
}
module arrow_quad(){
difference()
{
circle(5);
circle(4);
rotate([0,0,30-90])
translate([0,-5])
square(size = [10, 10], center = true);
rotate([0,0,330])
translate([5,5])
square(size = [10, 10], center = true);
rotate([0,0,0])
translate([0,-5])
square(size = [10, 10], center = true);
}
translate([2.5,5,0])
polygon(points=[[0,0],[-1,-2],[1,-2]]);
}
build.py
#!/usr/bin/env python3
import subprocess
import sys
import os
minSlots = 3
maxSlots = 9
#minSlots = 3
#maxSlots = 3
os.system("rm *.svg")
os.system("rm *.gif")
os.system("rm *.png")
#top view
for n in range(minSlots,maxSlots + 1,1):
a = ""
a = a + "'" + os.getcwd() +"/"+ "mechanism.scad" + "'" + " "
a = a + "-o "+ "'" + os.getcwd()+"/Internal Geneva Wheel top view "+str(n)+".svg"+ "'" + " "
a = a + "-D" + "n=" +str(n) + " "
a = a + "-D" + "volume=false" + " "
a = a + "-D" + "arrows=false" + " "
a = a + "-D" + "showInput=false" + " "
os.system("openscad " + a)
os.system("sleep 1")
#exit();
for n in range(minSlots,maxSlots + 1,1):
a = ""
a = a + "'" + os.getcwd() +"/"+ "mechanism.scad" + "'" + " "
a = a + "-o "+ "'" + os.getcwd()+"/"+"a"+".png"+ "'" + " "
a = a + "--animate "+ "36" + " "
a = a + "-D" + "n=" +str(n) + " "
a = a + "--imgsize=1024,1024 "
a = a + "--camera="
a = a + "0.00,0.0,-0.0," #translation
a = a + "180.00,0.00,0.00," #rotation #[ 180.00, 0.00, 0.00 ]
a = a + "140" + " " #distance
a = a + "--projection o"
#a = a + "--viewall"
print(a)
os.system("openscad " + a)
os.system("sleep 1")
#os.system("convert -brightness-contrast 10x5 a*.png z.png")
#os.system("./toGIFs.sh")
os.system("convert -brightness-contrast 10x5 -delay 10 -loop 0 *.png"+" "+"'" + "Internal Geneva Wheel top view "+str(n)+".gif"+"'")
os.system("sleep 1")
os.system("rm *.png")
os.system("sleep 5")
#exit();
#side view
for n in range(minSlots,maxSlots + 1,1):
a = ""
a = a + "'" + os.getcwd() +"/"+ "mechanism.scad" + "'" + " "
a = a + "-o "+ "'" + os.getcwd()+"/"+"z"+".png"+ "'" + " "
a = a + "--animate "+ "36" + " "
a = a + "-D" + "n=" +str(n) + " "
a = a + "--imgsize=1024,1024 "
a = a + "--camera=0.02,0.28,-0.11,218.10,0.00,11.180,140" + " "
# [ 2.02, 0.28, -0.11 ] #translation
#[ 218.10, 0.00, 11.70 ] #rotation
#8 2.67 #distance
#a = a + "--viewall"
print(a)
os.system("openscad " + a)
os.system("sleep 1")
#os.system("./toGIFs.sh")
os.system("convert -delay 10 -loop 0 *.png"+" "+"'" + "Internal Geneva Wheel "+str(n)+".gif"+"'" )
os.system("sleep 1")
os.system("rm *.png")
os.system("sleep 5")
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution 4.0 International license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:54, 6 February 2024 | | 135 × 135 (11 KB) | MichaelFrey | Uploaded own work with UploadWizard |
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