File:Internal Geneva Wheel 15.svg

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DescriptionInternal Geneva Wheel 15.svg	Deutsch: Malteserkreuzgetriebe, Inneres Stiftgetriebe
Date	6 February 2024
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();
        }
    }
}

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.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	19:54, 6 February 2024		128 × 128 (9 KB)	MichaelFrey (talk \| contribs)	Uploaded own work with UploadWizard

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Short title	OpenSCAD Model
Width	36mm
Height	36mm

File:Internal Geneva Wheel 15.svg

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Summary

Source Code

mechanism.scad

build.py

Licensing

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copyright license

Creative Commons Attribution 4.0 International

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original creation by uploader

inception

6 February 2024