|
|
|
Woodworkers
Source News
Be
a part of our email list! Get news about specials,
new shipments, and special deals.
CLICK
HERE to see the Current Issue.
CLICK
HERE to sign up.
|
Makore / African Cherry
(Mimusops
heckelii)
|
|
|
| Common
Names: |
|
Aganokwe
Baku
Makore
|
|
|
|
|
|
- Mechanical Values
| Category |
Green |
Dry |
Units |
| Weight |
54 |
37 |
lbs/cu.ft. |
| Density (air-dry) |
|
43 |
lbs/cu.ft. |
| Specific Gravity |
0.43 |
0.59 |
|
| Hardness |
|
980 |
lbs |
| Stiffness |
1273 |
1406 |
1000 psi |
| Bending Strength |
10355 |
12720 |
psi |
| Shearing Strength |
|
1610 |
psi |
| Max. Crushing
Strength |
5088 |
7360 |
psi |
| Work to Maximum Load |
13 |
11 |
in-lbs/in3 |
| Radial Shrinkage
(G->OD) |
|
6 |
% |
| Tangential Shrink.
(G->OD) |
|
8 |
% |
| Volumetric Shrink
(G->OD) |
|
|
|
- Environmental
Profile
The environmental status of this species within its
geographical range has not been officially
determined.
Distribution
The species is reported to occur in Africa, from
Sierra Leone to Cameroon, Gabon, and south to
Cabinda. It is reported to be widely distributed in
the high rain forests.
T/R Ratio
1.33
This indicator is more meaningful if it is used
together with other drying information and actual
shrinkage data in the tangential and radial
directions. (Refer to the Numerical Values window).
Product Sources
It is currently unknown whether material from this
species is available from sustainably managed,
recycled, salvaged, or other environmentally
responsible sources.
Tree Data
The trees are large, attaining heights of 180 to 200
feet (48 to 60 m), with trunk diameters often about
48 inches (120 cm), sometimes up to 10 feet (3 m).
It develops straight and cylindrical boles, that are
clear of branches for about 100 feet (30 m).
Sapwood Color
The sapwood is pale pink in color, and is clearly
differentiated from the heartwood. It averages about
2 to 3 inches (5 to 7.5 cm) in width.
Heartwood Color
The heartwood color varies from pink or light
reddish-brown to a rich red brown, sometimes with a
grayish tinge.
Grain
The grain is usually straight, but may be
interlocked. Wood with interlocked grain displays an
attractive mottled figure, with occasional dark
streaks.
Texture
Texture ranges fine to very fine.
Luster
The wood is lustrous.
Odor
There is no characteristic odor or taste.
Ease of Drying
The wood is fairly easy to season and dries at a
moderate rate.
Drying Defects
The material may distort slightly during drying.
Wood around knots may also split.
Kiln Schedules
T10 - D4S(4/4); T8 - D3S (8/4) US
Schedule H; United Kingdom
Movement in Service
Properly seasoned timber is reported to be
dimensionally stable, and retains its shape well
after manufacture.
Natural Durability
The heartwood is reported to have high natural
resistance to decay, but the sapwood is susceptible
to attack by powder-post beetle. The timber is also
resistant to Anobium borers and termites, but it is
occasionally attacked by pinhole and longhorn
borers. The wood may develop stains in contact with
iron.
Resistance to Impregnation
The heartwood is reported to be extremely resistant
to preservative treatment. The sapwood is moderately
resistant.
Toxic Constituents
Fine dust from the wood may cause irritation of skin
and respiratory passages in some individuals.
Silica Content
The timber usually contains high amounts of silica.
Blunting Effect
The wood exerts severe blunting effect due to its
high silica content.
Cutting Resistance
The wood is very difficult to saw because it is hard
and dense, and also because of high silica content.
Tungsten carbide tipped cutters are recommended.
Planing
A 20 degree cutting angle is necessary to avoid
tearing of quartersawn stock. High amounts of silica
tend to blunt cutting edges rapidly.
Turning
High amounts of silica tend to blunt cutting edges
rapidly but the material is reported to work
reasonably well in turning, boring, moulding,
mortising, and routing operations. Tungsten-tipped
cutters are recommended.
Splitting
The wood is reported to split easily in nailing and
screwing.
Gluing
The wood glues well.
Nailing
Pre-boring is recommended in order to prevent the
wood from splitting.
Screwing
Resistance to splitting is reported to be rather low
in screwing operations. Pre-boring is recommended.
Sanding
Sanding characteristics are reported to be good.
Polishing
The wood has good polishing characteristics.
Steam Bending
The heartwood steam bends satisfactorily, but the
sapwood is reported to be unsuitable for steam
bending.
Strength Properties
The bending strength of air-dried wood of the
species is similar to that of Teak, which is
considered to be strong. Compression strength
parallel to grain in the air-dry condition is high.
Teak, White oak, and Hard maple have high crushing
strength. It is fairly hard, resisting wear,
denting, and marring fairly well. The weight is
high. The wood is high in density.
|
|
|
