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As an example we use the follwing function to create washers:

On utilise la fonction suivant de création d'un boulon comme exemple :

import Part

import Part

def washer1(params,document):
key = params['key']
d1 = params['d1']
d2 = params['d2']
s = params['s']
name = params['name']

def washer1(params,document):
key = params['key']
d1 = params['d1']
d2 = params['d2']
s = params['s']
name = params['name']

part = document.addObject("Part::Feature",name)
outer = Part.makeCylinder(d2,s)
inner = Part.makeCylinder(d1,s)
part.Shape = outer.cut(inner).removeSplitter()

part = document.addObject("Part::Feature",name)
outer = Part.makeCylinder(d2,s)
inner = Part.makeCylinder(d1,s)
part.Shape = outer.cut(inner).removeSplitter()

This function uses the CSG facilities of FreeCAD, but it is equally possible to
use BRep scripting.

Cette fonction utilise les capacités CSG de FreeCAD, mais il est également possible
d’utiliser un script BRep.

In the first part of the function, we are assigning local variables with the
parameter values as a shortcut. In the second part of the function, we add a
new object to the document, create the geometry and assign it to the part.
`removeSplitter` cleans up artifacts resulting from CSG operation under certain
circumstances.

### Put it to the right place

This function should reside in a file (in this case called `washer.py`) with
extension `.py` in a subdirectory of the freecad directory which is named after
the collection to which the part belongs (in this case `washer`). This
directory must contain a empty file called `__init__.py` and the base file for
this collection (in this case `washer.base`).

### Write the base file

The base file provides BOLTS with all the informations it needs to know about
the files in a collection directory, it is a kind of manifest file. It contains
a list of sections (more precisely
[base file elements]({{ spec(base-file-element) }}))
, each describing one file: