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.
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