2. Production of sawn acacia stakes
Unlike the round post, sawn acacia posts can be produced from almost any diameter of log, as a larger post can be re-sawn to produce a thinner one.
There are different ways to make sawn stakes. They vary depending on the diameter of the acacia logs and the dimensions of the stakes to be produced.
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From 15 to 30 cm in diameter, acacia trunks are sawn in a 4-blade saw. It is the same principle as a band saw but with 2 rows of 2 bands spaced 5-10 centimeters apart each. The advantage is that in a single pass, each log is sawn into 5 boards. The boards are then passed through a multi-blade saw.
4-blade saw for sawing to produce unedged boards ("plateaus")
Principle of the 4-blade saw which makes 5 saw cuts in one pass.
Up to a diameter of 15 cm, acacia logs can be sawn directly in a bandsaw, a large 5.5 m long saw blade welded at the ends to form a circle. This saw rotates non-stop at a speed of 28.5 m/s (or 102 km/h).
Robinia is a hardwood to begin with, but forestry in Romania makes it even harder. The forests are dense and the trees grow slowly, which increases the hardness of the wood. As a result, the logs must be fed slowly through the saws, and the blades become dull in just 4 hours. They must be sharpened every 4 hours, and then wait 12 hours before they can be used again.
Bandsaw for sawing small logs or resawing larger sections of acacia