Whats is Floating Diameter Measurement?

Run faster. Measure more accurately. Maximize the value of every tree.

FDM (Floating Diameter Measurement) is a patented technological innovation that sets a new standard for diameter measurement in forestry. The FDM solution delivers the same high measurement accuracy regardless of feed speed, allowing you to work both faster and more gently — without compromising results. With FDM, there is no longer any need to press the stem against the chassis to achieve reliable diameter measurement. You can operate continuously with low pressure on the delimbing knives and feed rollers, enabling higher feed speeds, lower fuel consumption, reduced stem damage, and increased timber value.

This gives you:
  • High measurement accuracy — even at maximum production speed.
  • Lower fuel consumption thanks to reduced operating pressure.
  • Higher productivity through reduced resistance and optimized pressure levels.
  • Less stem damage, resulting in higher timber value.

The patented technology combines an advanced software with a new FDM sensor, placed in the movable top knife that now serves as the zero point for diameter measurement. The zero point is that way relocated, from the frame to the movable top knife, where the sensors gain full freedom to follow the stem without resistance and minimal friction. Together with the sensors in the delimbing knives, the new FDM-sensor continuously sends measurement data to the software, where it is processed at lightning speed through advanced algorithms that produce accurate and consistent diameter measurement – every time.

Thanks to the new technology, you never need to press the stem against the frame and you can work with low pressure on the delimbing knives and keep full production at all times. This means you minimize friction against the stem, thereby reducing stem damage and significantly increasing the timber value. This is a solution developed for today’s high production rates and for future demands on efficiency, fuel economy, and resource management.

Floating Diameter Measurement is more than an improvement. It represents a new level of measurement accuracy, enabling you to work faster, more gently, and with complete confidence in every measurement value.

FDM will be available as an option for both new and existing harvesting heads equipped with a movable top knife and in combination with NexSci/Dasa 7 H60/H70:

  • EC561
  • EC661LF
  • EC661LF Lite
The three sensors with the new FDM sensor at the top.
Would you like to experience FDM for real from inside the harvester cabin?
Experience the difference – book your demo today!
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