Forest-Master FM16 Bedienungsanleitung Seite 15

However there is a possibility that, if the moving Duocut blade
encounters a knot at a shallow angle then rather than stopping, the
blade may be deflected off line and if splitting continues the moving
carriage arms can be bent out of alignment.
When splitting logs, you should therefore monitor the moving duocut
blade and if you observe the blade being deflected away from the
centreline of the splitter, you should stop splitting immediately. After
the blade has returned to its stop you should turn the log through
90 degrees about the long axis and try splitting the log again.
To minimise the possibility of a knot deflecting the blade, it is
recommended to place logs that have a visible knot, so that the knot
is vertical. Note however that as explained on page 13, you must
not place a log with a split face towards the bed of the log splitter in
order to position a knot vertically.
FM16(D/T/TW/P) 15