Portable lumber grader
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Portable lumber grader | Fakopp

EN-338 norm establishes the strength classes for structural lumber. The Portable Lumber Grader is specifically crafted to adhere to this norm, accommodating two distinct species classes: deciduous and coniferous, which includes poplar. The grading process relies on assessing the modulus of elasticity (MOE) and the average specific gravity of the lumber. This system efficiently determines MOE and specific gravity within a swift timeframe of 1 second per lumber.

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Weighing scale

  • Dimensions: : 250 x 75 x 90 mm
  • Capacity: : 30-500 kg
  • Resolution: : 10 g
  • Output: : RS232 signal
  • Power supply: : 12 V adapter or 4 AA size batteries

Microphone

  • Type: : Unidirectional
  • Sensitivity: : -56 dB (0 dB = 1 V/mbar at 1000 Hz)
  • Frequency range: : 100 - 15000 Hz
  • Operational temperature: : 5 - 40 °C

Hammer

  • Weight: : 0.1 – 3% of the lumber weight

Grading

  • Principle: : mass, CKDR and MOE determination
  • Time requirement: : ~1 s
  • Grading table: : identical to the EN-338 norm

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