Machine strength grading with Dynagrade can be done in accordance with most timber standards.
Common grades in Europe are C18, C24, TR26, C30, T15 and T22, and in North America the MSR grades such as 1650f and 2100f.

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Fast and rational strength grading in transfer lines

Dynagrade is designed for lumber/timber strength grading and is easily installed in dry sorting mills and planer mills. The footprint is less than 1 meter (3 ft)! The maximum capacity is at least 240 lpm, and fulfills most demands.

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Simple principle – smart design

A spring-loaded impact mechanism (a kind of hammer) in the main unit is activated by the cross conveyed lumber/timber. Each stroke generates vibrations in the wood, and the generated sound is captured by robust high-tech microphones. At the same time, the length of the piece is measured by a laser-based length reader, alternatively imported from the PLC. The timber piece rests on special low-friction supports during the measurement itself, during the continuous operation.

Dynagrade is compact, robust, easy to install and use

Dynagrade requires small space and has few moving parts and no active components like motors or other. These features and the robust design imply a high availability and low maintenance cost for Dynagrade. Our 20 years experience tells us that a Dynagrade has a long life! Dynagrade requires no readjustment for different timber sizes. The grading result of Dynagrade shows a very high repeatability. Dynagrade has proven its function in over 130 mills.

Wide acceptance

Dynagrade has been scrutinized and verified by various testing institutes since 1996 for the most common grading standards. Dynagrade is approved in accordance with the European standard EN 14081 for machine strength grading of structural timber (C-grades) and glulam laminations (T-grades). Dynagrade is also approved in Canada and in the USA. Dynagrade is also approved for grading of glulam laminations according to the Japanese standard JAS. Grading of Australian MGP-classes is also done today with Dynagrade in Europe for lumber export to Australia.

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Dynagrade is based on the measurement of resonance frequencies and length. It is designed to be robust, simple-to-use and offers a wide spectrum of grading applications.

Main prerequisites:

  • Limber/timber size and length 1):

Thickness 19-110 mm, Width 60-300 mm, Length 1200-7200 mm

  • Sawn or planed surface
  • Dried lumber/timber, cut to angle
  • Required space: less than 1 meter (3 ft) of a transfer line with lugged chains (standard)
  • Grade, grading parameter and length output via RS232 and/or TCP/IP.

1) Length interval is max 4800 mm when measured with the optional length reader, i.e. a fixed interval from 1200-6000 mm up to 2400-7200 mm. No limitation in interval for imported length. Various standards and approvals may limit the size and length intervals.

Dynagrade is installed in over 120 mills. These are some examples of our clients (links direct to their websites)

Please tell us if a link has been outdated: e-mail.


Denmark, Norway & Sweden

Finland, Estonia, Latvia, Lithuania, Poland & Russia

Canada & USA

Switzerland, Germany & Austria