Spruce (Picea sitchensis) – CNC Router carving test
Spruce wood carved with clear cutting lines, with limited fraying at places but retains detail during the CNC router test. Test was run on a single relief with both 1/4′ router bits. The rotation speed versus feed rate is not critical but a small amount of burning did occur. The wood produced a clear surface with good developed shavings. Due to the carving lines, sanding was required starting at P240. Throughout the carving process the relief created some burs. We will test this wood type again due to the good quality of the carving.
More carvings using various wood are available in our carving library
Distribution: Northwestern North America all along the cold northern regions of the world
Other Names: Alcock’, Norway, Dragon, Alpine, Sargent’s, Brewer’s, Weeping, Chihuahua, Engelmann, etc. spruce. The list is long and requires more detail on the various sub types. We will hunt to find other spruce to test.
Characteristics: The color of Sitka spruce wood ranges from nearly white to pink to light brown, and sometimes has a candy-stripe look. Heartwood tends to run slightly darker.
Working Qualities: In the shop, you’ll find that it works easily with both hand and power tools. It nails, screws, and glues well, and takes a lustrous finish. However, because Sitka spruce is tough and stringy, bandsawing requires sharp, wide blades.
Uses: Sitka spruce imparts no taste or gives off no odor, so use it for food canisters, boxes, and butter molds. Its strength and lightness make it perfect for painted furniture and shelving, as well as moldings and doors. It is used in aircraft and boats due to the weight strength ratio. Quarter-sawn so the grain runs vertically, this wood becomes a top choice for soundboards of guitars, dulcimers, and other stringed instruments. It flexes to aid sound.
Technical Data: (Visit the Wood DataBase for explanation and details)
Tree Size: 130-160 ft (40-50 m) tall, 4-6 ft (1.2-1.8 m) trunk diameter
Average Dried Weight: 27 lbs/ft3 (425 kg/m3)
Specific Gravity (Basic, 12% MC): .36, .42
Janka Hardness: 510 lbf (2,270 N)
Modulus of Rupture: 10,150 lbf/in2 (70.0 MPa)
Elastic Modulus: 1,600,000 lbf/in2 (11.03 GPa)
Crushing Strength: 5,550 lbf/in2 (38.2 MPa)
Shrinkage: Radial: 4.3%, Tangential: 7.5%, Volumetric: 11.5%, T/R Ratio: 1.7
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