Defect/Board # 1 #2 #3 #4 #5 #6 Mineral streak x Fleck x Coloration x x x Sound knot Pin knot
x Black knot Bark pocket Curl White speck x Decay Blue stain x Worm hole x x Cluster of worm holes x Wane x x Split x Shake Through shake x Hit and miss x Mechanical burn x Defect/Board #7 #8 #9 #10 #11 Mineral streak x Fleck x x x x Coloration Sound knot x Pin knot
Black knot x Bark pocket x x Curl x x White speck Decay x Blue stain Worm hole x Cluster of worm holes Wane x Split x x Shake x Through shake Hit and miss Mechanical burn Table 3.
Nearly all veneers are subject to some minor problems, such as: pin knots
, gum knots, cross bars (or deviation in the grain), bark pockets, or worm tracks.
It also is a great wood for some of our more casual/rustic collections and the natural defects such as pitch pockets and pin knots
are not too overwhelming--just enough defect that the lumber is still stable," he added.
Least desirable features with our clients are pin knots
and contrast with growth rings, although for some markets and uses, those 'defects' are qualities that are preferred.
A fourth school attributes the name to the small pin knots
left in the lumber from the tree having numerous small branches.
It is a cleaner wood than sapele--it doesn't have the pin knots
that sapele can have.
The timber has medium density, bending and crushing strengths; very low stiffness and resistance to shock; moderate steam-bending qualities (it cannot be bent it pin knots
are present); and is easy to glue and finish.
Occasional pin knots
and small sound knots not over 1/8" (3.
There is a big demand for really clean maple -- material without pin knots
and sugar markings.
For instance, consider how many different categories of knots there are: live, dead, loose, cracked, tight, face, spike and pin knots
, to name a few.
This will involve the use of material using more "natural" characteristics such as mineral streaks and stains, bark pockets, bird pecks, grain swirls, pin knots
, knot clusters, sap pockets and small worm holes which are currently classified as defects.
Gummy cherry will often have black spots in the grain or pin knots
or a figure that today's industry "just doesn't want.