Macro Geneva Wheel: Difference between revisions
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{{Macro|Icon=Text-x-python|Name=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.|Author=Drei}} |
{{Macro|Icon=Text-x-python|Name=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.|Author=Drei}} |
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==How To Use== <!--T:2--> |
==How To Use== <!--T:2--> |
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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: |
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{|{{Prettytable}} |
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!Input |
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!Output |
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|-- |
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*a = Drive Crank Radius |
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*b = Geneva Wheel Radius |
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*n = Driven Slot Quantity |
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*p = Drive Pin Diameter |
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*t = Tolerance |
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*h = Height |
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*c = Distance Between Centers |
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*s = Slot Center Width |
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*w = Slot Width |
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*y = Stop Arc Radius |
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*z = Stop Disc Radius |
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*v = Clearance Arc |
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==Link== <!--T:4--> |
Revision as of 21:25, 23 October 2015
File:Text-x-python Geneva Wheel |
Description |
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Allows the user to create a Geneva wheel mechanism from scratch. Must edit values within the Macro to alter the size of the object. Author: Drei |
Author |
Drei |
Download |
None |
Links |
Macros recipes How to install macros How to customize toolbars |
Macro Version |
1.0 |
Date last modified |
None |
FreeCAD Version(s) |
None |
Default shortcut |
None |
See also |
None |
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 |
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Link
Macro Geneva Wheel GUI: A GUI front end based on this macro that allows the user to create a Geneva wheel mechanism from scratch.
Macro
#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
#a = Drive Crank Radius
#b = Geneva Wheel Radius
#n = Driven Slot Quantity
#p = Drive Pin Diameter
#t = Tolerance
#h = Height
# Output
#c = Distance Between Centers
#s = Slot Center Width
#w = Slot Width
#y = Stop Arc Radius
#z = Stop Disc Radius
#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
from FreeCAD import Base
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))
slotRadius = Part.makeCylinder(w,h)
slotRadius.translate(Base.Vector(-a,0,0))
slot=slotLength.fuse(slotRadius)
for i in range(6):
slot.rotate(Base.Vector(-c,0,0),Base.Vector(0,0,1),60)
genevaWheel = genevaWheel.cut(slot)
# Display Result
Part.show(driveCrank)
Part.show(genevaWheel)