EN 14081-2 PDF

We recently blogged on the comments that came from the last and second Enquiry stage , which was passed with positive vote just. It will shortly go to Formal Vote a stage at which only editorial comments can be considered. There is some haste to do so — to maintain compatibility with the revised EN hoping it will eventually be cited in the OJEU , and the amendment to EN which made big changes to how output control is done. Worth noting that EN will need to be amended again right away — since it currently points to the Enquiry draft of EN

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Two basic systems, referred to as "output controlled" and "machine controlled", are used. Both systems require a visual override inspection to cater for strength-reducing characteristics that are not automatically sensed by the machine. The output-controlled system is suitable for use where the grading machines are situated in sawmills grading limited sizes, species and grades in repeated production runs of around one working shift or more.

This enables the system to be controlled by testing timber specimens from the daily output. These tests are used together with statistical procedures to monitor and adjust the machine settings to maintain the required strength properties for each strength class.

With this system it is permissible for machine approval requirements to be less demanding and for machines of the same type to have non-identical performance. The machine controlled system was developed in Europe. Because of the large number of sizes, species and grades used it was not possible to carry out quality control tests on timber specimens drawn from production. The system relies therefore on the machines being strictly assessed and controlled.

Furthermore, considerable effort is required to derive the machines settings, which remain constant for all machines of the same type.

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DIN EN 14081-2:2010-11

Two basic systems, referred to as "output controlled" and "machine controlled", are used. Both systems require a visual override inspection to cater for strength-reducing characteristics that are not automatically sensed by the machine. The output-controlled system is suitable for use where the grading machines are situated in sawmills grading limited sizes, species and grades in repeated production runs of around one working shift or more. This enables the system to be controlled by testing timber specimens from the daily output. These tests are used together with statistical procedures to monitor and adjust the machine settings to maintain the required strength properties for each strength class. With this system it is permissible for machine approval requirements to be less demanding and for machines of the same type to have non-identical performance. The machine controlled system was developed in Europe.

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DIN EN 14081-2

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