Unstable software hooks can unexpectedly cause fatal errors inside .dwg databases, destroying weeks of topology alignments, layout definitions, and digital terrain models (MNT).
"Covadis 17.1h fix" likely refers to a specific maintenance update or patch for
I can provide more targeted steps once I know your and current build number .
Ensuring stable performance on newer versions of AutoCAD (e.g., AutoCAD 2021-2025) and BricsCAD. Topography & Modeling: Fixing errors in Digital Terrain Model (DTM) covadis 171h fix
Install the latest signed version of the Sentinel LDK runtime directly from the official developer resources rather than using the packaging bundled inside the legacy Covadis directory.
Turn off your real-time antivirus protection temporarily (Windows Defender often flags these fixes as false positives).
Repair broken wiring, clean corroded terminals. Reseat all field wiring – loose terminals are a top cause of "171h" timeouts. Unstable software hooks can unexpectedly cause fatal errors
This reset restores default settings and often resolves issues stemming from corrupted user profiles or partial configuration changes.
Follow the prompts to point the installation path to your default CAD directory.
In some spare parts lists, “171H” refers to a a Covadis prism/GNSS antenna over a mark. The fix there is simply: Topography & Modeling: Fixing errors in Digital Terrain
Covadis 17.1H is a version of the Covadis software that was released to provide users with new features, improvements, and bug fixes. The software is designed to work on Windows operating systems and is compatible with various file formats, including AutoCAD and MicroStation. Covadis 17.1H offers a range of tools and features for designing and detailing civil engineering projects, including road design, drainage design, and surveying.
This is the most common issue. You turn the machine on, and the motor hums, but the spindle refuses to spin, or it jerks violently. In 90% of cases, this is not an electrical fault. It is the Drawbar Assembly . Over decades, the belleville washers (disc springs) inside the drawbar fatigue and crack. They lose their tension, or worse, they shatter. This prevents the collet from releasing the tool correctly, or causes the spindle to lock up entirely.