Macro Geneva Wheel GUI

File:GW Dim Geneva Wheel GUI
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
Author
quick61
Download
None
Links
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Macro Version
1.0
Date last modified
None
FreeCAD Version(s)
None
Default shortcut
None
See also
None

How To Use

To use this Macro, copy it to your FreeCAD Macro directory and include the graphic image GW_Dim.png below in the same directory as the Macro.

Copy and include this graphic with the macro.

Screenshot

Macro

#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
#    Input
#a = Drive Crank Radius
#b = Geneva Wheel Radius
#p = Drive Pin Radius
#t = Geneva Wheel Tolerance 
#h = Geneva Wheel 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 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())

			#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((2*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(genevaWheelClearanceCut)
			Part.show(genevaWheel)
			#Part.show(stopArc)
			#Part.show(slot)

		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 Raidus ( 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)

		#
		# - 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()