Sectional timber testing device - uses thin wire caused to penetrate wood with measurement of penetration depth and penetration rate

摘要

The testing device uses an extremely thin metal wire with a pointed front end, which is rotated and caused to penetrate the wood, with detection of the penetration depth. The wire has a given length and is rotated at a constant rate, with the penetration velocity, indicating the density and firmness of the wood, being measured in dependence on the penetration depth. Pref. the twisting of the wire during penetration of the wood is compensated by a section with a slightly increased dia. directly behind the pointed front end. ADVANTAGE - Prevents damage to tested timber.