Our machine grading settings for UK-grown larch have been approved by CEN TC124 WG2 TG1.
The machines we developed settings for are:
Brookhuis MTG without balance for UK larch (includes the handheld version and the in-line version)
Brookhuis MTG with balance for UK larch (includes the handheld version and the in-line version)
The picture is very good.
We expect 100% yield for grades up to C20 and almost 100% C22 for MiCROTEC machines and 90% C22 for the handheld MTG (the difference is due to a reverse safety factor that is not applied for handheld machines to account for human fallibility)
For C24 the yield is around 65% (with the rest C14).
C27 yield is around 30-40% (with the rest as C16). The C27 could be marked C24 (it is allowed to mark higher grades as lower grades).
Size range covered
20 mm to 110 mm
47 mm to 303 mm
With minimum cross-sectional area of 2000 mm<sup>2</sup>