Today I generated customizable spring model.
Diameter, height, pitch and bar (rod? Im unsure which is correct in English) diameter can be changed in Property view. Script (fuse of many code snippets from forum:) is here:
Code: Select all
from __future__ import division # allows floating point division from integers
import FreeCAD, Part
from FreeCAD import Base
class MySpring:
def __init__(self, obj):
''' Add the properties: Pitch, Diameter, Height, BarDiameter '''
obj.addProperty("App::PropertyLength","Pitch","MySpring","Pitch of the helix").Pitch=5.0
obj.addProperty("App::PropertyLength","Diameter","MySpring","Diameter of the helix").Diameter=6.0
obj.addProperty("App::PropertyLength","Height","MySpring","Height of the helix").Height=30.0
obj.addProperty("App::PropertyLength","BarDiameter","MySpring","Diameter of the bar").BarDiameter=3.0
obj.Proxy = self
def onChanged(self, fp, prop):
if prop == "Pitch" or prop == "Diameter" or prop == "Height" or prop == "BarDiameter":
self.execute(fp)
def execute(self, fp):
pitch = fp.Pitch
radius = fp.Diameter/2
height = fp.Height
barradius = fp.BarDiameter/2
myhelix=Part.makeHelix(pitch,height,radius)
g=myhelix.Edges[0].Curve
c=Part.Circle()
c.Center=g.value(0) # start point of the helix
c.Axis=(0,1,0)
c.Radius=barradius
p=c.toShape()
section = Part.Wire([p])
makeSolid=1 #change to 1 to make a solid
isFrenet=1
myspring=Part.Wire(myhelix).makePipeShell([section],makeSolid,isFrenet)
fp.Shape = myspring
def makeMySpring():
doc = FreeCAD.activeDocument()
if doc == None:
doc = FreeCAD.newDocument()
spring=doc.addObject("Part::FeaturePython","My_Spring")
spring.Label = "My Spring"
MySpring(spring)
spring.ViewObject.Proxy=0
if __name__ == "__main__":
makeMySpring()1. List of one element looks funny section = Part.Wire([p]) but I don't know how make this without list. makePipeShell accept only lists...
2. I should use 4 spaces instead tabs. Sorry.
