Resolving RoboDK Fanuc Robot Library Download Crashes

A robot-library download does not involve controller current, axis torque, or motor thermal load. The number that matters is the application boundary: on the reported Windows installation, pressing Download for a Fanuc robot terminated RoboDK. This is software state, not heat. Separate the library transfer from the robot-file import to keep engineering work moving and to isolate the failing subsystem.

Failure Boundary and Operating Context

The crash occurs at a precise event: an operator selects a Fanuc robot from the integrated library and presses Download. RoboDK then exits instead of returning a file or opening the robot. The affected installation reported RoboDK 5.0.0, build 18091, with release date 2020-07-17, on Win64.

The installed build must be taken from the application's About dialog, not inferred from when the installer was downloaded. A newly downloaded installer can still install or launch an older build because of installer packaging, an existing installation, or the executable selected by a shortcut. The build shown in About identifies the process that actually crashed.

Download Paths Compared

Two paths reach the same engineering objective but exercise different software components. The integrated path combines library presentation, transfer handling, and import initiation inside RoboDK. The browser path performs the transfer outside RoboDK and leaves only local-file parsing and model opening to the application.

Use the browser-library path for production work. If the locally downloaded robot opens successfully, the robot file parser and basic model-loading path are operational; the failure boundary lies earlier, in the integrated library or download workflow. If the local file also crashes RoboDK, treat that as a second failure and preserve its separate trigger sequence and log.

Browser-Library Import Procedure

1. Start RoboDK and record the version, build, and release date from About.
2. Open the RoboDK online library in a standard web browser rather than opening the library inside RoboDK.
3. Locate the required Fanuc robot and download its robot file to a known local folder. Retain the downloaded file unchanged for repeat testing.
4. Return to RoboDK. Drag the downloaded robot file from the local folder and drop it into the RoboDK window.
5. Allow RoboDK to open the robot, then save the working project through the normal project workflow.

This procedure changes only the transfer path. It does not alter the robot definition, controller configuration, kinematics, payload data, or program logic. Those items still require the normal project-level checks before simulation results are used for an application decision.

Crash Diagnostics and Decision Path

Capture the debug log from the same run that produces the crash. The reported attachment was named RoboDK.debug.txt, and that file was accepted for analysis. Preserve the file before repeatedly restarting the application because later sessions can change diagnostic content.

1. Close unrelated RoboDK sessions so the next log maps to one operator sequence.
2. Start RoboDK and record the About values.
3. Open the integrated library, select the same Fanuc robot, and press Download once.
4. After the process terminates, copy RoboDK.debug.txt and label it with the action that produced it.
5. Restart RoboDK and perform the browser download plus drag-and-drop import.
6. Record whether the local file opens, fails with a visible message, or terminates the process. If it terminates, preserve that run's log separately.

A successful browser transfer followed by a successful local import narrows the problem to the integrated download path. A successful browser transfer followed by an import crash moves the investigation toward the downloaded file or the local importer. Failure to obtain the file in the browser is a transfer or browser problem and does not reproduce the RoboDK button-triggered crash.

Verification and Recurring Pitfalls

Verify recovery by outcome, not by the age of the installer. RoboDK must remain running, accept the dropped file, and open the selected Fanuc robot. Close the project, reopen RoboDK, and repeat the local-file import once; this confirms that the result was not dependent on the original browser session.

Keep the integrated-library test distinct from the workaround. Repeatedly pressing Download exercises the known failing path and adds little information after a clean reproduction and log capture. Reinstalling without checking About can also leave the same executable in service, so compare the displayed version and build after any installation change.

The browser workaround demonstrates access to the robot file; it does not prove that all simulation inputs are correct. Before using the model, check that the selected Fanuc robot is the intended model and review the project data that affect reach, tooling, frames, payload assumptions, and collision behavior. Read those values from the imported model and project configuration rather than deriving them from the filename.

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