# Difference between revisions of "Macro Geneva Wheel"

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Geneva Wheel

Description
Allows the user to create a Geneva wheel mechanism from scratch. Must edit values within the Macro to alter the size of the object.

Macro version: 1.0
Author: Drei
Author
Drei
ToolBar Icon
Macro Version
1.0
2014-09-21
All
Default shortcut
None
None

## Description

Allows the user to create a Geneva wheel mechanism from scratch. Must edit values within the Macro to alter the size of the object.

## How To Use

This Macro creates the main parts of a Geneva Wheel Mechanism. It depends on six values that must be altered in the code, read the comments in the code. The variables are:

Input Output
• a = Drive Crank Radius
• b = Geneva Wheel Radius
• n = Driven Slot Quantity
• p = Drive Pin Diameter
• t = Tolerance
• h = Height
• c = Distance Between Centers
• s = Slot Center Width
• w = Slot Width
• y = Stop Arc Radius
• z = Stop Disc Radius
• v = Clearance Arc

Macro Geneva Wheel GUI: A GUI front end based on this macro that allows the user to create a Geneva wheel mechanism from scratch.

## Script

ToolBar Icon

Macro_Geneva_Wheel.FCMacro

```#Creation of a Geneva Wheel with Parametric values  By: Isaac Ayala (drei)
#This Macro creates the main parts of a Geneva Wheel Mechanism

#It depends on six values that must be altered in the following code
#The variables are a, b, n, p, t and h.

#Definition for each variable
#    Input
#n = Driven Slot Quantity
#p = Drive Pin Diameter
#t = Tolerance
#h = Height
#    Output
#c = Distance Between Centers
#s = Slot Center Width
#w = Slot Width
#v = Clearance Arc

#Please note that you can alter the code so it depends on five values exclusively
#Just replace c, and either a or b with the following
#    Keep value for a
#c = a/math.sin(math.pi/n)
#b = math.sqrt((math.pow(c,2))-(math.pow(a,2)))
#    Keep value for b
#c = b/math.cos(math.pi/n)
#a = math.sqrt((math.pow(c,2))-(math.pow(b,2)))

from __future__ import division
import time
import math
from PySide import QtCore, QtGui
import Part

#Inputs
a = 25.0
b = 60.0
n = 6
p = 4
t = 0.01
h = 5
T = 60

#Outputs
c = math.sqrt(pow(a,2) + pow(b,2))
s = a + b - c
w = p + t
y = a - (1.5 * p)
z = y - t
v = (b * z)/a

#    Create the Drive Crank (Will be placed on the origin)
driveCrank = Part.makeCylinder(z, h)
driveCrank.translate(Base.Vector(0,0,0))

genevaWheelClearanceCut = Part.makeCylinder(b, h)
genevaWheelClearanceCut.translate(Base.Vector(-c,0,0))

driveCrank = driveCrank.cut(genevaWheelClearanceCut)

driveCrankBase = Part.makeCylinder((1.5*a), h)
driveCrankBase.translate(Base.Vector(0,0,-h))

driveCrank = driveCrank.fuse(driveCrankBase)

drivePin = Part.makeCylinder(p,h)
drivePin.translate(Base.Vector(-a,0,0))

driveCrank = driveCrank.fuse(drivePin)

#    Create the Geneva  Wheel (Will be placed on the x-axis on the left side)
genevaWheel = Part.makeCylinder(b,h)
genevaWheel.translate(Base.Vector(-c,0,0))

stopArc = Part.makeCylinder(y, h)
stopArc.translate(Base.Vector(((y-(b/2)),0,0)))
stopArc.rotate(Base.Vector(-c,0,0),Base.Vector(0,0,1),30)

for i in range(6):
stopArc.rotate(Base.Vector(-c,0,0),Base.Vector(0,0,1),60)
genevaWheel = genevaWheel.cut(stopArc)

slotLength = Part.makeBox(s,(2*w),h)
slotLength.translate(Base.Vector(-a,-w,0))