PyPC-NC

by Stefan Siegl

PyPC-NC is a GUI application to controll a CNC mill that has a CNCCON axis controller by "Burkhard Lewetz - Ingenieurbüro für technische Software-Entwicklung"; hence it is kind of an alternative to his WinPC-NC software for Windows PCs.

Features

Python/PySide based GUI application, hence plattform independent
displays certain machine status information
automatic reference movement + manual movements
storing workpiece location (and moving back to its' origin)
G-Code import & interpreter
graphical rendering of G-Code on XY plane (bird's eye view)
polar coordinate based position correction
CNCCON mock implementation

G-Code interpreter limitations

The G-Code interpreter is far from being fully-fledged (and error-free). But still it supports most of the code popular plugins and free CAM software exports.

Especially the interpreter (currently) lacks support for

plane switching (currently solely XY plane is supported)
helical arcs (G2 and G3 code with Z axis word)
B-splines and nurbs
boring canned cycles (G84 to G89)
dwells and dwell-requiring canned cycles (G82, G86 et al)
tool length & radius compensation
path blending
coordinate system selection
spindle speed override during program execution (serial command C)
conditional blocks, loop constructs and expression evaluation

Besides block execution is mostly from left to right. Other G-Code interpreters don't necessarily execute left to right.

Gimmicks

mockserial, binds the mock implementation to a PTY which can be provided to WinPC-NC via Wine (thus allowing mock sessions with WinPC-NC)

Bug in pyside-uic

There is a bug in pyside-uic, caused by use of QButtonGroup and yields "an unexpected error occured" message during make. See https://bugreports.qt-project.org/browse/PYSIDE-126 for details.

sudo vim /usr/share/pyshared/pysideuic/uiparser.py +212 and replace bg_name = bg_i18n.string by bg_name = bg_i18n.

Links

G-Code Quick Reference

License

FabLabRothenburg/PyPC-NC

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