SOLID WOOD MACHINING
side. In other words, do not wet
for more than an hour at most.
Remove the water and then let
this convex side dry. As this side
dries, it will shrink and hopefully
the amount of shrinkage will be
enough to result in a flat piece.
The problem with this technique
is that it is hit or miss as far as
how much water to add. Further,
flatness is not permanent; the
piece will cup if rewetted.
An alternative method is to
steam the piece, getting it “
soaking wet” throughout as well as
hot. Then bend it flat and dry it
while holding it flat. This again is
not totally permanent and is hard
QWhen I plane lumber, I am getting a sig- nificant wavy surface,
which takes a lot of sanding to get
smooth. We also are seeing some
chatter with narrow pieces. Why?
AFor waves, my first guess is that you have one knife that is protruding
further out of the head than the
other knives. So, the surface you
are seeing is basically a one-knife
surface. This can be determined
by measuring the distance between each ridge and comparing
the measurement with the calculated distance as if each knife is
This calculated distance is:
D = ( 12 F)/(T N), where D
= calculated distance between
ridges in inches; F = feed speed
in feet per minute; T = number of
knives per head; N = head speed
in rpm; and R = the radius (1/2
the diameter) of the head including the projection distance of the
knives (the 12 in the formula is
to convert the feed speed into
inches per minute.).
One way to obtain equal
projection for all the knives is
to joint the knives after they are
This exciting innovation from HOLZ-HER
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