Broken Connection | Powermill Post Processor Error

Some custom posts have a fixed buffer size for APT lines. A massive 3D finishing toolpath with 2+ million points can overflow that buffer, causing an abrupt disconnection.

Switch to a generic post like fanuc_6m.opt . If that posts correctly, your dedicated machine post has an internal error. powermill post processor error broken connection

PowerMill does not write G-code directly. It creates an internal file called an file. Think of APT as a "neutral" language describing tool movements, spindle speeds, coolant commands, and tool changes—without knowing if the target machine is a Haas, DMG Mori, or Fanuc. Some custom posts have a fixed buffer size for APT lines