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We
gratefully give our thanks and acknowledgements to Mr Duncan Richards of
D. F. RICHARDS (VENEERS
LIMITED) for his permission in
allowing us to reproduce this page from his Company's web site which
demonstrates how veneers are cut from the log.
This page also illustrates how most of the figuring and grain effects
you see in your veneers is actually achieved by the expertise of the
veneer suppliers and preparers. |
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GRAIN PATTERNS
The grain structure of
different species of wood vary tremendously and as a naturally grown
product they vary from within their own specie from tree to tree. Being
able though to bring about some predictability to this structure has
obvious advantages. This can be achieved by slicing in a variety of ways. |
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1/. Flat-Cut /
Flat-Sliced / Plain-Sliced
This is probably the
most common form of veneer slicing performed on decorative
hardwoods. As shown in the picture left. The slicer presses through
the log on a plane tangential to these growth rings. The result is a
roughly symmetrical central grain pattern that is characterised by a
"catherdreling" of the grain and also ellipses and ovals. This form
of slicing undoubtedly produces the most attractive and regular form
of "crown" veneer. |
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As the slicer
approaches the centre of the log i.e. its core (shown dark in the
illustration), it will start to become defective. At this stage it
is usually necessary to trim out this defective centre, leaving
straight grain or half-grain or half-crown veneer, largely free from
the cathedrals, ellipses and ovals mentioned earlier. Once through
the core normal slicing can resume. It is for this reason that the
flat-cut logs are often deemed to have two sides. |
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2/. Quarter-Cut
Often it is desirable
to maximise the yield of straight grained material from a log i.e.
that free of cathedrals, ellipses and ovals. This is especially the
case when people are trying to achieve continuity throughout a range
of veneer products. Some species also do not lend themselves to
being flat-cut, either due to their crown wood being unattractive or
the texture of the wood making it difficult to produce. |
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The logs are firstly
cut into quarters. The log is then sliced on a plane that is
tangential to the growth rings and on the 45% line from the centre
of the log. The result is highly regular quarter-cut or straight
grained veneer. |
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3/. Half-Round
This is a variation
of the flat-cut method of slicing veneer. It is produced on a face
lathe by rotating the log around an off-centre axis in an arc. This
method results in almost the whole of the log yielding a crown
feature. it also, by increasing the plane of the cut, increases the
width of veneer produced, hence making it a useful technique when
processing narrow logs. Because of the off-set axis of the log the
crown is often not as central as that produced from the flat-cut
logs. Also the crown effect is much "wilder" (i.e. catherdraling,
etc, is not as pronounced) than that produced under the flat-cut
method. The greater the circumference of the log then generally the
more wilder the grain becomes. |
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4/. Rotary-Cut
This is when a log is
rotated about its central axis and peeled from the outside. The
grain pattern that is produced is a large swirl'y pattern of
irregular shapes. This method is rarely used on decorative
hardwoods, it is usually employed to maximise yields from cheap
woods used to produce veneer for plywoods. |
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