post processor acts as a translator, converting your programmed toolpaths into the specific G-code language required by your CNC machine
. Because every machine control (Fanuc, Haas, Mazak, etc.) has its own unique logic and syntax, a high-quality post is essential for generating "edit-free" code that runs safely and efficiently. Cam Solutions How to Get or Modify a Post Processor
If your current post is producing errors or needs "tweaks" (like moving a coolant code or changing how a 4th axis behaves), you typically follow these steps to work with a reseller or the GibbsCAM Post Department GibbsCAM Forums
While there isn't a single definitive "paper" titled "GibbsCAM Post Processor," several technical documents and studies from major institutions and industry experts explore how these post processors bridge the gap between CAM software and CNC machines. 1. Key Technical Studies & Reports
Oak Ridge National Laboratory (ORNL) Report: This document discusses the industrial deployment of GibbsCAM, specifically focusing on Post Processor Development as the interface between CAM software and specific numerical controlled (NC) machines. It explores advanced applications like Directed Energy Deposition (DED) and how post-processing must manage heat input and toolpath patterns like radiused raster endcaps.
A Study on Post Processor for 5-Axis CNC Milling: Published in Springer, this paper investigates how post processors translate CAD/CAM data into NC programs for complex 5-axis machines. It uses GibbsCAM and other systems to analyze performance gaps and validate results by comparing CAD models to actual machined parts. 2. Specialized Guides & Industry Whitepapers
GibbsCAM 14 Advanced Coordinate Systems (CS): This guide focuses on rotary positioning (4th and 5th axis moves). It emphasizes that users needing A and B moves must use an Advanced CS Post Processor to ensure accurate output when machining in non-XY planes, such as for bottle molds.
Heidenhain Post Processor Best Practices: A technical overview from mchip.net highlights how the GibbsCAM Heidenhain post processor is a pivotal tool for bridging CAM programming with specific control systems to elevate machining accuracy. 3. Practical Post-Processing Solutions
PostHaste: A free, customizable post-processor available to GibbsCAM users. It allows for user-level modifications, such as combining tool changes and coolant commands on the same line, though it is less sophisticated than purchased, vendor-supported posts.
APT/CL Plugin: For those looking to "de-couple" from Gibbs' internal post department, there are licensed APT/CL options that provide generic output for external post-processing or specific manufacturing suites like DMG Mori. 4. Customization & Troubleshooting
GibbsCAM post processors are the essential software "translators" that convert your toolpath data (VNC files) into the specific machine code (G-code) required for your CNC equipment to function. Because every machine has unique control requirements, having a correctly configured post processor is critical for accurate and efficient production. Key Functionality & Management
Purpose: They translate internal CAM data into NC programs readable by specific machine controls like Haas, Mazak, Mori Seiki, and more.
File Types: Older post processors typically use a .pst extension, while newer versions often utilize the .poss format.
Installation: To load a new post, you can save the received ZIP file and simply drag it into any open GibbsCAM window; the software automatically places the files in the correct directories.
Advanced Operations: Certain tasks, such as enabling Probing Operations on Scribd, require specific modifications to the post processor to ensure compatibility with inspection cycles. Modifying Your Post Processor
If your G-code output isn't exactly how you want it—for example, if you need to adjust coolant timing or tool change speeds—you typically work through an authorized reseller for modifications. Steps for Requesting Modifications: How to Load a Post Processor File Package
In GibbsCAM, a post processor is the critical "translator" that converts your toolpath data into the specific G-code required by your CNC machine. Unlike some CAM systems that use generic drivers, GibbsCAM typically uses specialized files to ensure "what you see on the screen is what you get" at the machine. 1. Installation and Setup
Installing your post processor involves placing specific files in the correct directories so GibbsCAM can recognize your machine's configuration. File Types .PST or .POSS : The main post processor file. .MDD (Machine Definition Data) : Defines the machine's physical axes and limits. .VMM (Virtual Machine Model)
: Used specifically for Multi-Task Machining (MTM) and complex simulation. Installation Path
C:\ProgramData\3D Systems\GibbsCAM\[Version]\[MDD or VMM folder] Post Files gibbscam post processor
can be stored anywhere, but creating a dedicated "GibbsCAM Posts" folder on your C drive with subfolders for Mill, Lathe, and MTM is recommended for organization. 2. Requesting or Modifying a Post
Because GibbsCAM post processors are highly customized and often proprietary, they are generally obtained through authorized resellers rather than open-source libraries. Daystrom Technologies New Post Requests
: You must typically submit a formal order form specifying the machine make, model, and controller (e.g., Fanuc, Haas, Siemens). Modifying Existing Posts
: If your code needs a specific tweak (like changing an M-code or adjusting G54 placement), follow these steps to ensure the developer has what they need: Mark up the NC code
: Manually edit a sample G-code file with comments showing exactly what should change. Create a Pack and Go : In GibbsCAM, go to File > Pack and Go to bundle all parts, tools, and settings into a single : Email both the marked-up G-code and the file to your post department (e.g., CAMCO Support 3. Editing Tools While generic posts can sometimes be edited using
(often included with certain licenses), full GibbsCAM posts require specialized software.
: This is the official GibbsCAM utility for building and editing post processors. It is powerful but typically restricted to developers and advanced users.
: A simpler template-based editor that can be used for basic 3-axis milling or simple lathe work if your license allows.
In GibbsCAM, a post processor is the essential "translator" that converts your toolpath (VNC file) into the specific G-code "dialect" required by your CNC machine controller. Quick Installation
The fastest way to install a post processor package (often provided as a .zip file from a reseller) is to drag and drop the zip file directly into any open GibbsCAM window.
Clicking "Okay" automatically places all necessary files—including the post processor, MDD (Machine Device Descriptor), and VMM (Virtual Machine Module)—into their correct folders.
For version 2023 and newer, post-processors typically use the .poss extension, while older versions used .pst. How to Request a Modification
If your G-code requires manual edits after posting, you should have your post processor professionally modified to achieve "post and go" results. To request a change from your GibbsCAM Reseller:
In GibbsCAM, "putting together a report" typically refers to using the Reporter plug-in to generate setup sheets, tool lists, or operation summaries for the shop floor. While the post-processor generates the G-code for the machine, the Reporter plug-in extracts data from your part file into an Excel-based format. 1. Generating Standard Reports
To generate a predefined report from your current part data:
Open the Reporter: Navigate to the Plug-ins menu and select Reporter. Select Report Type: Choose from standard templates like: Part Report: General overview of the part file.
Tool Report: Detailed list of all tools used in the operations.
Operation Report: A step-by-step breakdown of the machining process.
Execute: Click OK to launch Excel and populate the report with live data from your GibbsCAM session. 2. Creating Custom Report Templates post processor acts as a translator, converting your
If the standard reports don't meet your needs, you can create custom templates using these four steps:
Define Needs: Identify which specific data points (e.g., tool offsets, spindle speeds, part orientation) are required.
Design Excel Model: Create an Excel file (.xlsx) to serve as the visual layout for your report.
Write Template Text File: Create a text file containing the Reporter Commands that map GibbsCAM data to specific cells in your Excel model.
Test & Install: Place these files in the GibbsCAM folder (requires Administrator access) and test them through the Plug-ins menu. 3. Reporting Post-Processor Issues
If your "report" is actually a request to modify a post-processor, you must provide a specific data package to your reseller or developer:
G-Code with Markups: Generate the NC code and manually edit it to show exactly how it should look.
Pack-and-Go File: Use the "Pack and Go" feature to bundle your part file (.vnc), post-processor, and MDD/VMM files into one package.
Submission: Email this package to your support provider (e.g., Virtual Manufacturing).
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.
The shop smelled like coolant and brass. Machines hummed in a patient chorus; a trim of light caught the chips on the floor like a sparse constellation. Jonah wiped his hands on a rag and stared at the monitor where the CAM toolpath rolled in slow, patient green lines. The part looked perfect on-screen: pockets, fillets, threads—the neat logic of geometry and constraint. But every run on the Haas had taught him the same blunt truth: the CAM's output was an opinion, not a promise.
He scrolled to the post-processor settings. The file name read gibbs_output.nc. For years, Jonah's relationship with these files had been intimate and practical. The post-processor was the translator between GibbsCAM's cleverness and the machine's blunt truth. One wrong line, one misunderstood axis, and the spindle could try to cut thin air—or the vice.
He opened the post. The header was a tidy block of metadata: job number, operator, material, revision. Then the g-code came in paragraphs: motion, dwell, toolchange. He skimmed for patterns, the subtle mistakes: a dwell encoded as G04 P0.5 while the machine expected P500; an M-code for coolant that the controller ignored; a canned cycle whose local parameters would double up the stepovers. Small things, but the sort that erode production schedules like hairline cracks in a crankshaft.
On the bench behind him, Maria tightened the screws on a newly refurbished collet. She watched Jonah's frown deepen and asked, “Problem?”
“It’s the post. Gibbs thinks it’s smart. The controller thinks it’s a poetry reading.” He laughed, but his voice had that steady edge—half frustration, half affection. “I need to massage the output so the Haas understands.”
He saved a copy as gibbs_output_review.nc and launched the editor. He moved line by line, changing dwell syntax, swapping M8 and M9 for coolant control he knew the machine would respect, inserting a spindle-acceleration block to ease the heavy step-ins for the 1.25" endmill. He added comments—little anchors to future him: ; ADDED: spindle ramp 0-3000 RPM over 2s; ; FIX: coolant M8 before toolchange.
There’s art in this. The post-processor isn’t only code. It’s empathy translated into G and M codes: knowing the machine’s temper, the vise’s habit of slipping at the third clamp, the spindle’s faint whine above 2,200 RPM. A post that respects those details reduces surprises, and Jonah had become a small-scale prophet of the shop floor—foreseeing chatter, heat, and the inevitable burr.
He ran the dry-run in simulation. The motion traced clean arcs. He smiled; the feedrates softened where the program would otherwise slam corners into the workpiece. But the true test lived on the steel table.
Minutes later, the part sat in the vise, cold and solid. Jonah selected the file. The Haas breathed awake, its screen illuminating the dim shop like a patient inner eye. Tool one swept out, an endmill gleaming. Spindle start. The cutter approached the stock with habits learned from humans: gradual ramp, coolant engaged, stepdown eased. The machine danced along the adjusted profiles, not quite elegant, but careful—attentive. one misunderstood axis
Midway through the roughing, the monitor showed a reaction: a subtle load spike on a pass that the unedited post would have treated as normal. Jonah watched the spindle load meter and nudged the feed down three percent—an adjustment he’d anticipated, and had written notes for in the header. The cutter found a pocket of harder inclusions. Without the spindle ramp and eased depths he’d added, the endmill might have screamed and broken. Instead, it groaned and wore through, leaving a clean scallop of stock.
That night, when the lights dimmed and the shop ticked with settling metal, Jonah documented the change requests. He uploaded a revised post to the repository, annotated and tested with the machine’s peculiarities in mind. He wrote instructions at the top: use with Haas VF-2, controller version 19, and warned about the tool-offset origin shift that had cost them two rejected parts last quarter.
For Jonah, the post-processor was never final. Every run taught him new exceptions and eccentricities: a worn bearing’s whisper, a clamp that loosened on hot days, a spindle taper that flirted with harmonic chatter. Each pushed him to refine the translation. He imagined the post-processor as a living bridge—code that learned, in small increments, how to keep steel and software speaking without error.
Weeks later, a junior operator, Luis, stopped by with a stack of parts. “Your edits saved us two scrap runs,” he said, genuinely relieved. Jonah shrugged, tired and satisfied. “Gibbs gives you the map. It’s the post that knows the road.”
He returned to the terminal and began another revision, not as punishment of a machine's ignorance but as a collaboration: the CAM's idealism tempered by the floor’s merciful realities. Every comment, every replaced M-code, every dwell rewritten was a small act of care for the spindle and the operator. In a field of metal and torque, the post-processor carried a human patience—a quiet insistence that precision is not only geometry but a conversation written in code.
Outside, a train passed; the shop vibrated, briefly, then settled. Jonah closed the editor and stepped into the night, the taste of oil and accomplishment warm in his hands. Tomorrow, the code would run again; the machine would teach him something new, and somewhere between GibsCAM’s assumptions and the Haas’ language, Jonah would write the next line that kept them speaking.
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
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.
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