Gibbscam Post Processor !!better!! Page

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. gibbscam post processor

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, a post processor is the essential

2. The Variable Declaration Block

Defines custom variables: cFeedRate, cSpindleSpeed, bUseHighSpeedPeck, nMaxLineNumber, etc.

Step 3 – Modify Macros & Variables

Example variable assignment in post logic: Swiss-Type Posts For Swiss lathes (Citizen, Star, Tsugami),

$spindle_speed = 5000
$feed_rate = 100.0
IF ($coolant == 1) THEN OUTPUT "M08"

Swiss-Type Posts

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:

• G-code families for dual paths (e.g., G code group for main path, G code group for sub path with wait codes M100/M101).
• Fine control over Z1, Z2 axes and C1, C2 rotaries.
• The ability to switch between “Guide Bushing Advance” and “Retract” modes.

Anatomy of a GibbsCAM Post Processor (GPP File)

Legacy GibbsCAM posts often used a .pst or .txt format. However, modern versions (GibbsCAM 2016 and later) have transitioned to the GPP (Gibbs Post Processor) format, a more powerful and structured system. A GPP file is essentially a script written in a proprietary language that contains sections for:

Part 2: Why Default Posts Are Never Enough

New GibbsCAM users often ask: "Why can’t I just use the built-in 'Generic Fanuc' post?" The short answer is safety and efficiency.

3. In-House or Freelance Post Builders

Skilled CAM programmers can build posts using the GibbsCAM Post Processor Development Kit (PDK). Independent consultants (available on forums like CNCZone or PracticalMachinist) often charge $500–$2,000 for a custom post.