Scripted Parts: Ball Bearing - Part 2/ru

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Руководство
Тема
Part Scripting - Ball Bearing #2
Уровень
Beginner
Время для завершения
30 min
Авторы
r-frank
FreeCAD версия
0.16.6706
Примеры файлов
Смотрите также
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.

Making the groove

Drawing an arc needs either three points or a start angle and an end angle.
In the sketcher we would use constraints to define the start point and the end point of the arc.
Since we can't do this in scripting, we draw a rounded rectangle and revolve it to get a basic "ring shape".
Then we draw a circle and revolve it to get the geometry of the groove.
Then we apply a boolean cut to the two revolved shapes and we have the complete shape of the inner/outer ring.


Inserting the balls

The correct sketcher-based workflow of inserting the balls would be:


Now this is not effective, inserting primitives and positioning them is easier and faster in this case.
So we use the same method as in "Scripted Parts: Ball Bearing - Part 1".


Links

Scripted objects: The wiki page explaining 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")
#
#Lines for basic shape of outer ring
L1o=Part.makeLine((R4,0,TH-RR),(R4,0,RR))
L2o=Part.makeLine((R4-RR,0,0),(R3+RR,0,0))
L3o=Part.makeLine((R3,0,RR),(R3,0,TH-RR))
L4o=Part.makeLine((R3+RR,0,TH),(R4-RR,0,TH))
#Corner rounding for basic shape of outer ring
A1o=Part.makeCircle(RR,Base.Vector(R4-RR,0,RR),Base.Vector(0,1,0),0,90)
A2o=Part.makeCircle(RR,Base.Vector(R3+RR,0,RR),Base.Vector(0,1,0),90,180)
A3o=Part.makeCircle(RR,Base.Vector(R3+RR,0,TH-RR),Base.Vector(0,1,0),180,270)
A4o=Part.makeCircle(RR,Base.Vector(R4-RR,0,TH-RR),Base.Vector(0,1,0),270,360)
#Connect Lines and arcs to make wire and upgrade to face, revolve and apply cut to obtain groove
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(0,0,360))
C1=Part.makeCircle(RBall,Base.Vector(R2+(R3-R2)/2,0,TH/2),Base.Vector(0,1,0),0,360)
GRo=Part.Wire([C1])
GRo=Part.Face(GRo)
GRo=GRo.revolve(Base.Vector(0,0,1),Base.Vector(0,0,360))
OR=OR.cut(GRo)
Part.show(OR)
#
#Lines for basic shape of inner ring
L1i=Part.makeLine((R2,0,TH-RR),(R2,0,RR))
L2i=Part.makeLine((R2-RR,0,0),(R1+RR,0,0))
L3i=Part.makeLine((R1,0,RR),(R1,0,TH-RR))
L4i=Part.makeLine((R1+RR,0,TH),(R2-RR,0,TH))
#Corner rounding for basic shape of inner ring
A1i=Part.makeCircle(RR,Base.Vector(R2-RR,0,RR),Base.Vector(0,1,0),0,90)
A2i=Part.makeCircle(RR,Base.Vector(R1+RR,0,RR),Base.Vector(0,1,0),90,180)
A3i=Part.makeCircle(RR,Base.Vector(R1+RR,0,TH-RR),Base.Vector(0,1,0),180,270)
A4i=Part.makeCircle(RR,Base.Vector(R2-RR,0,TH-RR),Base.Vector(0,1,0),270,360)
#Connect Lines and arcs to make wire and upgrade to face, revolve and apply cut to obtain groove
IR=Part.Wire([L1i,A1i,L2i,A2i,L3i,A3i,L4i,A4i])
IR=Part.Face(IR)
IR=IR.revolve(Base.Vector(0,0,1),Base.Vector(0,0,360))
C2=Part.makeCircle(RBall,Base.Vector(R2+(R3-R2)/2,0,TH/2),Base.Vector(0,1,0),0,360)
GRi=Part.Wire([C2])
GRi=Part.Face(GRi)
GRi=GRi.revolve(Base.Vector(0,0,1),Base.Vector(0,0,360))
IR=IR.cut(GRi)
Part.show(IR)
#
#Balls#
for i in range(NBall):
  Ball=Part.makeSphere(RBall)
  Alpha=(i*2*math.pi)/NBall
  BV=(CBall*math.cos(Alpha),CBall*math.sin(Alpha),TH/2)
  Ball.translate(BV)
  Part.show(Ball)
#
#Make it pretty#
App.ActiveDocument.recompute()
Gui.ActiveDocument.ActiveView.viewAxometric()
Gui.SendMsgToActiveView("ViewFit")


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