installed. If jointing does not fix
the problem, then you likely have
a bearing problem.
For chatter, if you see problems planing narrow pieces, I
suspect the flat bed plate is worn
in the middle. Wide pieces are
held firmly by the edges of the
bed plate, but the wear in the
middle means narrow pieces are
free to move up and down. If you
feed a narrow piece to the left or
right edge, will it be OK? If so,
that confirms my diagnosis. You
could also have a pressure bar
that’s worn or chip breakers that
aren’t set correctly.
QWhat are some other planing defects and how do I prevent
ADefects such as ripples and raised grain can ruin your project. Here
are simple solutions.
Ripples: There are three basic
causes for this to occur. First is
that feed speed is too fast. The
second cause of ripples is that the
bed plate of the planer is no longer flat. A third potential cause
will happen when the knives are
dull and push some of the wood
down into the lumber face rather
than plane it off.
Raised grain: This will only
occur with woods that have a
large density difference within an
individual annual growth ring.
It results when the knife pushes
the dense latewood into the soft
earlywood, instead of cutting
the wood fibers. The cure is to
take smaller cuts and use sharper
Source: Gene Wengert, “The Wood Doc-
tor,” has been training people in efficient use
of wood for 35 years. He is extension special-
ist emeritus at the University of Wisconsin-
Madison. He can be reached at wooddoc@
uwalumni.com. You can read past columns
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