Dealing with GibbsCAM post processors typically involves reporting errors for correction or requesting specific modifications to the G-code output. Users can also generate "reports" like tool summaries using specific internal functions. Reporting Issues and Requesting Modifications
To report a bug or request a modification for a GibbsCAM post processor, you must provide a detailed package so the post-processing department can replicate your environment:
Create a Pack and Go File: Navigate to File > Pack and Go and select all files. This creates a .gcp or zip package containing your part file, tooling, and machine data.
Generate and Mark Up NC Code: Output the G-code file and use a text editor to clearly highlight (mark up) the specific lines that need changing. For example, note if an M8 coolant code needs to move or a tool call format needs adjustment.
Submit the Request: Email the marked-up G-code and the "Pack and Go" file to the GibbsCAM Post Department or your local reseller.
Error Detection: Since GibbsCAM 2015, the system includes Fatal Post Error detection. If an error occurs during processing, a dialog will appear with details about why the posting failed. Generating Tool and Operation Reports gibbscam post processor
If you need a physical report (like a tool list) related to your post-processed file:
Reporter Function: Use the built-in Reporter function to generate tool summaries and operation sheets, often in Excel format.
Custom Macros: Some users develop custom macros (e.g., "tool sum. All Ops") to create simplified, faster tool reports that don't require external software like Excel. Debugging Tools for Developers
If you are developing or troubleshooting a post processor yourself, GibbsCAM provides the Post Debugger:
Watches Window: Allows you to inspect the state of variables and data during the posting process. Graphical interface – Instead of editing raw text,
Status Register: A "Status Record" tracks internal post-processor instructions like SetInc for incremental values.
For technical assistance with a specific post error, you can contact GibbsCAM Support at (607) 319-1686. Editing tool list summary - GibbsCAM Support Forums
To access VPP, go to Machine > Post Processor > Edit Virtual Post. From there, you can modify:
For most shops, VPP is now the recommended approach. Only legacy machines or highly specific custom logic require the old .PST workflow.
GibbsCAM stores posts in the Posts subdirectory (usually C:\GibbsCAM\Posts\). Copy the generic Fanuc.pst to Haas_VF_SS.pst so you don’t corrupt the original. To access VPP, go to Machine > Post
For Swiss lathes (Citizen, Star, Tsugami), the post must manage guide bushings, synchronized main and sub spindles, and cross-drilling/milling attachments. A dedicated GibbsCAM Swiss post processor typically supports:
While full post development requires scripting expertise, many daily modifications can be made by a savvy programmer using the GibbsCAM Post Processor Editor (a free utility included with GibbsCAM). Here is a step-by-step workflow for common edits:
G00 G90 G54 X0. Y0. S5000 M03 (Rapid + Spindle on)
G43 H01 Z2.0 M08 (Tool length + Coolant)
G01 Z-0.125 F50.0
G01 X1.0 Y1.0 F100.0
In the world of Computer-Aided Manufacturing (CAM), few components are as critical—yet as misunderstood—as the post processor. For users of GibbsCAM, one of the most powerful and flexible CAM systems on the market, the post processor is the vital bridge between a virtual 3D model and a physical machined part. Without a correctly configured GibbsCAM post processor, your meticulously toolpathed geometry is nothing more than a collection of pretty pixels on a screen.
A post processor translates the generic toolpath data (CL data—Cutter Location data) from GibbsCAM into specific, machine-readable G-code that your CNC controller understands. Whether you run a Haas VF-2, a DMG Mori 5-axis mill, a Mazak Quick Turn lathe, or a Citizen Swiss-type lathe, the post processor dictates everything: from spindle speeds and coolant commands to complex multi-axis kinematics.
This article dives deep into the world of GibbsCAM post processors. You will learn what they are, how to customize them, common pitfalls, advanced 5-axis considerations, and where to find or build the perfect post for your shop floor.