circular saw; a SkilSaw blade for a
SkilSaw; etc. The tooth angle var-ies for each type of saw to avoid
a hazardous and uncontrolled
SkilSaws come in various sizes
and styles, including left-handed
models for “southpaws.” In all
cases, the saw moves (rather than
having a stationary saw and moving the wood, so, unlike a circular table saw, the wood being cut
must be well secured. Although
the saw may be a bit heavy, if the
wood is properly supported, the
saw rests on the wood for most
of the cut and the operator only
steers and pushes the saw forward
to do the cutting.
QWhat’s the optimum number of knife marks per inch when
ATo answer your ques- tion, I need to know, “How much sanding do you want to do
and how smooth does the surface
need to be?” The best for many
cases is between 12 to 20 marks
per inch with the higher number meaning a smooth planed
surface with less sanding to be
really smooth. The lower number
meaning a bit rougher and
perhaps an experienced eye will
see knife marks if sanding is not
There is variation in species
when assessing the best number
of knife marks. For example,
see Figure 7 in Machining and
Related Characteristics of Unites
States Hardwoods written by
E.M.Davis in 1962 (U.S. Dept.
of Air Technical Bulletin No.
When sanding, remember that
moisture content and sharp sandpaper are important factors.
QYour previous com- ments about rough mill yield have been
helpful. Can you be
more specific on how you sug-
gest we analyze our waste? And
do you have any other ideas?
AA very useful tech- nique for evaluating a rough mill cut-up operation is to examine the wood waste pieces. You
should identify the reason why a
particular piece of wood is going
into the waste hog rather than
into the pile of acceptable pieces.
The more separations or reasons
that you have, the more useful
the data will be.
• Some of the important fac-
• Knot or knot hole or associ-
ated cross grain (Make sure that
you include the cross grain area
around the knot, as such wood is
hard to machine and glue.)
• End check or split (Almost
all end checks, which are splits
smaller than 1/4 inch wide, are
avoidable with proper end coating in drying.)
• Surface check or internal
check, also called honeycomb
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