KicadStepUp Workbench/de

Einführung
Kicad Aufstockung Arbeitsbereich zielt darauf ab, sowohl KiCad als auch FreeCAD Benutzer bei der Zusammenarbeit mit der elektrischen (ECAD) und mechanischen (MCAD) Konstruktion zu unterstützen.

Hintergrund
Kicad (Webseite) ist eine Open-Source Elektronikkonstruktions Automatisierungssuite. Sie ermöglicht es, eine elektrische Schaltung zu entwerfen und eine ein oder mehrlagige Leiterplatte mit einer umfangreichen Bibliothek von Teilen zu erstellen. Das Tolle daran ist, dass die Verwendung von FreeCAD und KicadStepUp Arbeitsbereich der offizielle Weg ist, um 3D Teile für elektrische Komponenten für Kicad zu erstellen. Die Bibliotheken werden bereitgestellt durch hier, so dass jeder Teile erstellen und einchecken kann.

KiCADs GUI Philosophie ist im Vergleich zu FreeCAD etwas anders, vor allem, wenn es darum geht, Elemente zu erstellen und sie zu verschieben. Da Kicad jedoch seit Jahren in der Produktion eingesetzt wird, gibt es eine ausgezeichnete Dokumentation, z.B. ein sehr gutes "Getting Started" Dokument. Zusätzlich hat jedes Werkzeug sein eigenes Handbuch.

Wenn man Kicad noch nicht kennt, empfiehlt es sich, eine eigenständige Leiterplatte gemäß dem Leitfaden für den Einstieg zu erstellen, um die Konzepte zu verstehen. Obwohl einige Themen wie das Hinzufügen von neuen Schaltplänen und Fußstapfen zu einer lokalen Bibliothek für den Anfänger wenig interessant zu sein scheinen, stößt man in der Praxis oft schnell darauf, wenn man ein ernsthaftes Projekt beginnt. Für alle diese Kicad Konzepte findet man im KicadStepUp Arbeitsbereich eine Art von Funktion. Wenn man diese also kennt, ist es viel einfacher zu verstehen, wie man diesen Arbeitsbereich benutzt.

Funktionen

 * Load kicad board and parts in FreeCAD and export it to STEP (or IGES) for a full ECAD MCAD collaboration
 * Load kicad_mod footprint in FreeCAD to easy and precisely align the mechanical model to kicad footprint
 * Convert the STEP 3D model of parts, board, enclosure to VRML with Materials properties for the best use in kicad
 * Check interference and collisions for enclosure and footprint design
 * Design a new pcb Edge with FreeCAD Sketcher and PUSH it to an existing kicad_pcb Board
 * PULL a pcb Edge from a kicad_pcb Board, edit it in FC Sketcher and PUSH it back to kicad
 * Design a new footprint in FreeCAD to get the power of Sketch in footprints
 * Generate Blender compatible VRML files



Einrichtung
KicadStepUp is part of the external workbenches, and can be automatically installed using the FreeCAD Add-on Manager which comes bundled with FreeCAD 0.17, under the  menu.

General Approach
The basic idea of KicadStepUp is to synchronise data between the two applications. For home use you might have open FreeCAD and Kicad at the same time. Professional use work on the same files (e.g. on a central server) and have specialists on mechanical CAD (MCAD) working in FreeCAD and electronics experts on electrical CAD (ECAD).

KicadStepUp will converts standard FreeCAD files to Kicad files and vise versa. That way each application can work with its native data files. Projects can be used without the other application or KicadStepUp installed. That also the reason, that no plugin on the Kicad side is required.

Undestanding the fine details of the workflow its helpful to note that the differences between the two programs impose some difficulties for a full data exchange. One example is that the Sketcher used in Kicad to define the board outline is much more limited compared to the FreeCAD Sketcher, so in order to synchronise back and forth the model content can not be more complex than the Kicad Sketcher can handle. From a FreeCAD point of view, that means you may loose data. KicadStepUp offers workarounds that might be more difficult to understand if you do not have this background.

Basic Workflow
A a collaboration can be started with a new or an existing project. We consider here a new project to keep things simple:

Try to make another PushPull round trip: adjust you "pcb design" sketch to the changes from Kicad, add some other change and start again. Do that a few times to appreciate how quickly and naturally this procedure becomes in a very short time.
 * 1) Create a new Kicad Project anywhere you like. Lets name it "KsuTest"
 * 2) Open the PCB Editor and create on the layer "Edit.Cuts" a closed outline. Shape does not matter, we will overwrite it anyway.
 * 3) Create a new FreeCAD file for the PCB, the name does not matter. *
 * 4) Create a sketch with an outline of the desired PCB. Lets name it "pcb design" (but could be any other name) and put at least one circle into it for a hole.
 * you may use any FreeCAD features to include holes, cutouts and outer shape to other components you might have. We assume here you would use Sketcher features as Dimensioning, Constraints and Work geometry in your sketch.
 * If you are using PartDesign WB for creating the sketch there is no need to create a PartDesign body, since we are not going to pad this sketch.
 * 1) Switch to the KicadStepUp Workbech
 * 2) Select the "pcb design" sketch
 * 3) Select the Toolbar button "Push Sketch to PCB Edge" or the menu ksu PushPull/ksu Push Sketch to PCB
 * 4) * first a dialog will open with defaults "Edge.Cuts" for layer and "0.16" for line width. Keep those defaults.
 * 5) * next a file dialog will open. Click to your Kicad "KsuTest" project, where you should see a file "KsuTest.kucad_pcb". That is the PCB file with the temporary outline we created before. Select is and confirm to replace the old file. Now a dialog should say "new Edge pushed to kicad board!"
 * if you forgot the 2nd step, you the push operation might fail as a pcb file must exist and it must not be empty.
 * 1) Cloase and re-open the PCB Editor in Kicad. **
 * The shape from the FreeCAD sketch should appear.
 * 1) go over the circle with the mouse and press m on the keyboard to move the circle. Click to place to another position. Press the save toolbar button on the top left.
 * 2) Switch to FreeCAD and select in the KicadStepUp Workbech the tool button "Pull Sketch from PCB" or the menu ksu PushPull/ksu Pull Sketch from PCB
 * 3) * first dialog with default layer "Edge.Cuts" and three choices will open. Select choice "replace PCB and Sketch in current document" ***
 * 4) * next a file dialog should show again the file "KsuTest.kucad_pcb". Select it and press Open
 * You should see your PCB as 3D model. Note that the hole has moved compared to you "pcb design" sketch.
 * In the tree appears a new structure with a yellow Part Container with the Kicad Filename and within another Part Container with "Board_Geoms_e63b" (the part with the number probably different). In the second container there are the following three files. Do not change any names in that structure, because KicadStepUp uses them to find the parts to update.
 * Do not forget to save your file

Now you can use the new 3D PCB file to align 3D components as connectors, buttons, switches, fasteners, etc. or add this to your assembly if you have a larger project.

This only shows the very basic way KicadStepUp works. Your are still missing a lot at this point, e.g. footprints and 3D parts. But from there its a lot easier to start exploring KicadStepUp on your own. Use the documentation PDF file in the menu ksu Tools/Demo


 * ''Notes:
 * As long as the name of the created strucure (and its parts) is unchanged any workflow interactions will just update the structure. If you change any names, a new structure will be created each time.
 * It is not required to have Kicad running to update Kicad project files. Actually, Kicad does not even have to be installed on the PC.
 * The standard approach is to use the same sketch on both sides Kicad and Freecad. Any changes will be synchronized to the other application. This is the most natural and clean way to work with KicadStepUp However, this causes a problem if you want to use any of the following features in your sketch definting you PCB shape: dimensions, geometry constraints, work geometry (blue lines) or external linked geometry. There is no clean way to do this, because Kicad does not know any of the features. That means that on the round trip between the applications any of those features will be deleted. There is not real solution for that problem, just a selection of one of several workarounds. So if you want to use any of those features that means you define the PCB shape in FreeCAD only and sync in one way to Kicad. Any outline changes done in Kicad need to be added manually on the FreeCAD side. This might make sense, e.g. if future changes from the mechanical side are much more likely than from the electrical side. There several ways to do it
 * Put the design sketch inside the KicadStepUp structure, an select "replace PCB and keep Sketch in curr. doc" every time you import back from Kicad.
 * Keep the design sketch outside the KicadStepUp structure. Ignore the sketch imported from Kicad.
 * The second choice has the advantag that changes in Kicad can be traced to the original sketch and the FreeCAD sketch is protected against an accidently wrong import choice. The described workflow uses this approach to make sure the issue is well understood. From there its easy to switch to modifying the KicadStepUp supplied sketch with none of the more advanced FreeCAD features.
 * To use KicadStepUp with a FreeCAD assembly (> V0.19) you could add a new file for the PCB. After the workflow above has been run once add the 3D object for the PCB to your assembly like any other mechanical part. Make sure you save the file when it was updated by KicadStepUp (KicadStepUp writes to FreeCAD memory not to FreeCAD files).

''

Bitte schau den kicad StepUp Spickzettel für die anderen Funktionen an.

Referenzen

 * Autor: Github: @easyw | FreeCAD Foren: kicad StepUp: ECAD MCAD bidirektionale Zusammenarbeit
 * Quellcode auf GitHub: https://github.com/easyw/kicadStepUpMod

Nebenbemerkung zu Externen Arbeitsbereichen
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Die Seite externe Arbeitsbereiche enthält einige Informationen und Anleitungen zu einigen von ihnen, und das Projekt FreeCAD Erweiterungen hat sich zum Ziel gesetzt, diese zu sammeln und sie von FreeCAD aus leicht installierbar zu machen.

Neue Arbeitsbereiche sind in der Entwicklung, bleib dran!