Heidenhain Tool radius too large alarm: Tool radius too large

The TNC cannot calculate path/offset because the configured radius is larger than the geometry allows. It is an alarm from the Program area, and in the catalog it is listed as “Tool radius too large”. On the machine you notice it like this: Radio compensation failure, Arco/contorno imposible, Concrete block message.

On the shop floor it almost always comes from one of these causes: Poorly defined tool, Radius larger than the inner arc, Impossible geometry (entry/exit), Errores de post. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset after correcting radius or geometry. Resetting without fixing the cause first only hides the problem: Heidenhain Tool radius too large trips again and, in the meantime, you keep working with the machine in bad shape.

With the machine stopped and in a safe state, start with these checks: Verificar radio en tabla TOOL, Review geometry in simulation, Check the contour lead-ins/lead-outs. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Heidenhain Tool radius too large active, avoid this: Do not reduce radius in table without knowing what tool there is physically, Do not machine if the tool does not fit. Skipping any of these points is what turns a minor stop into an expensive breakdown.

Normally requires no maintenance. If you are not sure how far it goes, stop the machine and report it: a repeat alarm always works out cheaper than a crash.

It is a stop alarm: the cycle will not continue until you fix the cause. It does not always mean serious damage, but it leaves the machine where it is and you have to check it before running again. Guidance reference. Always confirm the full text in the exact machine/control manual.