{{Macro |Name=Geneva Wheel GUI |Icon=GW_Dim.png |Description=A GUI front end that allows the user to create a Geneva wheel mechanism from scratch. Based on drei's Macro Geneva Wheel |Author=quick61 |Version=1.0 |Date=2014-09-21 |FCVersion=All |Download=[https://www.freecadweb.org/wiki/images/8/8d/GW_Dim.png ToolBar Icon] }}
A GUI front end that allows the user to create a Geneva wheel mechanism from scratch. Based on drei's Macro Geneva Wheel
To use this Macro, copy it to your FreeCAD Macro directory and include the icon graphic in the same directory as the Macro.
Copy and include this graphic with the macro.
ToolBar Icon
Macro_Geneva_Wheel_GUI.FCMacro
{{MacroCode|code= #Creation of a Geneva Wheel with Parametric values By: Isaac Ayala (drei) & Mark Stephen (quick61) #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
#a = Drive Crank Radius #b = Geneva Wheel Radius #p = Drive Pin Radius #t = Geneva Wheel Tolerance #h = Geneva Wheel Height #n = Driven Slot Quantity
#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
#c = a/math.sin(math.pi/n) #b = math.sqrt((math.pow(c,2))-(math.pow(a,2)))
#c = b/math.cos(math.pi/n) #a = math.sqrt((math.pow(c,2))-(math.pow(b,2)))
from future import division import math from FreeCAD import Base from PySide import QtGui, QtCore from PySide.QtGui import QApplication, QDialog, QMainWindow import Part import Draft class p():
def Ggear(self):
try:
#Inputs
a = float(self.dCr.text())
#b = float(self.gWr.text())
p = float(self.dPd.text())
t = float(self.gWt.text())
h = float(self.gWh.text())
n = float(self.gWn.text())
#Outputs
#c = math.sqrt(pow(a,2) + pow(b,2))
c = a/math.sin(math.pi/n)
b = math.sqrt((math.pow(c,2))-(math.pow(a,2)))
s = a + b - c
w = p + t
y = a - (3 * p)
z = y - t
v = (b * z)/a
m = math.sqrt((v**2)+(z**2)) # Solves for location of clearance cut axis
# 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))
genevaWheelClearanceCut = Part.makeCylinder(v, h)
genevaWheelClearanceCut.translate(Base.Vector(-m,0,0))
driveCrank = driveCrank.cut(genevaWheelClearanceCut)
driveCrankBase = Part.makeCylinder((a+(2*p)), 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.rotate(Base.Vector(-c,0,0),Base.Vector(0,0,1),(180/n))
for i in range(int(n)):
stopArc.rotate(Base.Vector(-c,0,0),Base.Vector(0,0,1),(360/n))
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(int(n)):
slot.rotate(Base.Vector(-c,0,0),Base.Vector(0,0,1),(360/n))
genevaWheel = genevaWheel.cut(slot)
# Display Result
Part.show(driveCrank)
Part.show(genevaWheel)
except:
FreeCAD.Console.PrintError("Unable to complete task. Please recheck your data entries.")
self.close()
def close(self): self.dialog.hide()
def init(self): self.dialog = None
self.dialog = QtGui.QDialog()
self.dialog.resize(240,100)
self.dialog.setWindowTitle("Geneva Wheel Macro")
la = QtGui.QVBoxLayout(self.dialog)
DCR = QtGui.QLabel("Drive Crank Radius ( A )")
la.addWidget(DCR)
self.dCr = QtGui.QLineEdit()
la.addWidget(self.dCr)
#GWR = QtGui.QLabel("Geneva Wheel Radius ( B )")
#la.addWidget(GWR)
#self.gWr = QtGui.QLineEdit()
#la.addWidget(self.gWr)
DPD = QtGui.QLabel("Drive Pin Radius ( C )")
la.addWidget(DPD)
self.dPd = QtGui.QLineEdit()
la.addWidget(self.dPd)
GWT = QtGui.QLabel("Geneva Wheel Tolerance ( D )")
la.addWidget(GWT)
self.gWt = QtGui.QLineEdit()
la.addWidget(self.gWt)
GWH = QtGui.QLabel("Geneva Wheel Height")
la.addWidget(GWH)
self.gWh = QtGui.QLineEdit()
la.addWidget(self.gWh)
GWN = QtGui.QLabel("Driven Slot Quantity")
la.addWidget(GWN)
self.gWn = QtGui.QLineEdit()
la.addWidget(self.gWn)
#
# - Include graphic image in dialog window -
#
# Insure that image is in the same directory as this Macro.
# Image should be available from same source as Macro.
#
import os
macro_dir = os.path.dirname(__file__)
self.PiX = QtGui.QLabel()
self.PiX.setPixmap(os.path.join(macro_dir, "GW_Dim.png"))
hbox = QtGui.QHBoxLayout()
hbox.addStretch()
hbox.addWidget(self.PiX)
hbox.addStretch()
la.addSpacing(15)
la.addLayout(hbox)
la.addSpacing(15)
# - End Image layout -
okbox = QtGui.QDialogButtonBox(self.dialog)
okbox.setOrientation(QtCore.Qt.Horizontal)
okbox.setStandardButtons(QtGui.QDialogButtonBox.Cancel|QtGui.QDialogButtonBox.Ok)
la.addWidget(okbox)
QtCore.QObject.connect(okbox, QtCore.SIGNAL("accepted()"), self.Ggear)
QtCore.QObject.connect(okbox, QtCore.SIGNAL("rejected()"), self.close)
QtCore.QMetaObject.connectSlotsByName(self.dialog)
self.dialog.show()
self.dialog.exec_()
p() }}
This Macro is based on Macro Geneva Wheel
documentation index > Macro Geneva Wheel GUI