Scripted Parts: Ball Bearing - Part 2: Difference between revisions
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Just some small differences.<br /> |
Just some small differences.<br /> |
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*Create a new empty document and make it the active document |
*Create a new empty document and make it the active document |
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*Draw the basic shape of the outer ring consisting of four straight lines and four arcs |
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*Connect the lines and arcs and upgrade them to one single wire |
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*Upgrade the wire to a face |
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*Revolve the face to get a shape |
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*Draw a circle |
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*Upgrade circle to wire |
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*Upgrade wire to face |
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*Revolve face and apply boolean cut to obtain groove in outer ring |
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*Draw the basic shape of the inner ring consisting of four straight lines and four arcs |
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*Connect the lines and arcs and upgrade them to one single wire |
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*Upgrade the wire to a face |
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*Revolve the face to get a shape |
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*Draw a circle |
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*Upgrade circle to wire |
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*Upgrade wire to face |
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*Revolve face and apply boolean cut to obtain groove in inner ring |
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*Insert balls with same workflow as in part 1 (because of effectiveness) |
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*Set view to axometric |
*Set view to axometric |
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*Zoom to fit all |
*Zoom to fit all |
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===Making the groove===<!--T:4--> |
===Making the groove===<!--T:4--> |
Revision as of 09:53, 17 August 2016
Tutorial |
Topic |
---|
Part Scripting - Ball Bearing #2 |
Level |
Beginner |
Time to complete |
30 min |
Authors |
r-frank |
FreeCAD version |
0.16.6706 |
Example files |
See also |
None |
Introduction
This tutorial is meant as a beginner's introduction to creating parts with python scripts within FreeCAD.
This tutorial will cover how to build a ball bearing with a workflow that consists of creating sketches and revolving them.
The code will produce a new FreeCAD document with 12 shapes (Inner Ring, Outer Ring and 10 balls/spheres).
It will look like this:
Workflow
The workflow is more or less identical how you would create the part in part design workbench.
Just some small differences.
- Create a new empty document and make it the active document
- Draw the basic shape of the outer ring consisting of four straight lines and four arcs
- Connect the lines and arcs and upgrade them to one single wire
- Upgrade the wire to a face
- Revolve the face to get a shape
- Draw a circle
- Upgrade circle to wire
- Upgrade wire to face
- Revolve face and apply boolean cut to obtain groove in outer ring
- Draw the basic shape of the inner ring consisting of four straight lines and four arcs
- Connect the lines and arcs and upgrade them to one single wire
- Upgrade the wire to a face
- Revolve the face to get a shape
- Draw a circle
- Upgrade circle to wire
- Upgrade wire to face
- Revolve face and apply boolean cut to obtain groove in inner ring
- Insert balls with same workflow as in part 1 (because of effectiveness)
- Set view to axometric
- Zoom to fit all
Making the groove
Bla and blub ...
Inserting the balls
Notes
Bla and blub ...
Links
Scripted objects: The wiki page explaing the basics of scripting
Topological data scripting: A tutorial for covering basics of scripting
Scripted Parts: Ball Bearing - Part 1: Doing it with part primitives
Bearings from scripted sketches: Base for this tutorial, thanks to JMG ...
Code
## Ball-bearing script
## 11.08.2016 by r-frank (BPLRFE/LearnFreeCAD on Youtube)
## based on ball bearing script by JMG
## (http://linuxforanengineer.blogspot.de/2013/12/bearings-from-scripted-sketches.html)
#needed for doing boolean operations
import Part
#needed for calculating the positions of the balls
import math
#needed for translation and rotation of objects
from FreeCAD import Base
#VALUES#
#(radius of shaft/inner radius of inner ring)
R1=15.0
#(outer radius of inner ring)
R2=25.0
#(inner radius of outer ring)
R3=30.0
#(outer radius of outer ring)
R4=40.0
#(thickness of bearing)
TH=15.0
#(number of balls)
NBall=10
#(radius of ball)
RBall=5.0
#(rounding radius for fillets)
RR=1
#first coordinate of center of ball
CBall=((R3-R2)/2)+R2
#second coordinate of center of ball
PBall=TH/2
#Create new document
App.newDocument("Unnamed")
App.setActiveDocument("Unnamed")
App.ActiveDocument=App.getDocument("Unnamed")
Gui.ActiveDocument=Gui.getDocument("Unnamed")
#Lines for basic shape of outer ring
L1o=Part.makeLine((R4,0,RR),(R4,0,TH-RR)
L2o=Part.makeLine((R4-RR,0,TH),(R3+RR,0,TH)
L3o=Part.makeLine((R3,0,TH-RR),(R3,0,RR))
L4o=Part.makeLine((R3+RR,0,0),(R4-RR),0,0)
#Corner rounding for basic shape of outer ring
A1o=Part.makeCircle(RR,Base.Vector(R4-RR,0,TH-RR),Base.Vector(0,1,0),0,90)
A2o=Part.makeCircle(RR,Base.Vector(R3+RR,0,TH-RR),Base.Vector(0,1,0),90,180)
A3o=Part.makeCircle(RR,Base.Vector(R3+RR,0,RR),Base.Vector(0,1,0),180,270)
A4o=Part.makeCircle(RR,Base.Vector(R4-RR,0,RR),Base.Vector(0,1,0),270,360)
#Connect Lines and arcs to make wire and upgrade to face
OR=Part.Wire([L1o,A1o,L2o,A2o,L3o,A3o,L4o,A4o])
OR=Part.Face(Or)
OR=OR.revolve(Base.Vector(0,0,1),Base.Vector(360,0,0))
#Todo
#Make it pretty#
App.activeDocument().recompute()
Gui.activeDocument().activeView().viewAxometric()
Gui.SendMsgToActiveView("ViewFit")