Two dual-column bandsaws cut bar stock and sections up to 560 mm. Stress relieving is done in-house, on the sawn blank, before machining.
The two bandsaws are not one big and one small: their capacities are complementary. One takes the thickest round, the other the widest rectangle. Entering the section of the material shows which one takes it - and whether it only fits turned.
The capacities are those in the two saws’ data sheets. Cutting length is not limited by them but by the material and by handling; it is confirmed on enquiry.
A rectangular section has no single orientation. A 700 × 400 mm bar does not fit a 500 × 750 capacity as written, but it fits turned on its side. The check here tries both orientations, because that is what happens on the shop floor - an order is not refused because the material was measured in the other order.
Stock is never cut to final length. The sawn end is rough and has to be faced back to a clean surface, and the part needs a length to be held by in the chuck - a length that is parted off at the end. The ordered length is therefore always greater than the one on the drawing, and the difference is material that is paid for and never leaves for the customer.
The blade runs between 20 and 100 m/min, and the choice within that range belongs to the material, not to the operator. Stainless calls for low speed and steady feed: too fast and it work-hardens, blunting the teeth in a single cut. Aluminium calls for the opposite. A badly cut bar costs more than the time saved.
Rolled stock has internal stresses locked into it. While the bar is whole they balance one another; the moment cutting takes the outer layer away, the balance breaks and the part moves - sometimes by more than the tolerance about to be held. That is why the sawn blank is stress relieved before the first chip: the stresses are released with heat, on a part that carries no dimension yet. A dimension taken before stress relieving does not stay where it was put.
The bar ordered is always longer than the sum of the parts: every cut consumes the width of the blade plus the facing allowance, and the end held in the vice never becomes a part. The loss is the same on every piece, so on short parts it weighs far more.
| Part length mm | Pieces per bar of 3 m | Material used % |
|---|---|---|
| 20 | 126 | 84.0 |
| 50 | 55 | 91.7 |
| 120 | 23 | 92.0 |
| 200 | 14 | 93.3 |
An example, not a tariff: a 3000 mm bar, an 80 mm clamped end that can no longer be cut, 3 mm lost at every cut - the kerf plus the facing allowance. The rest is division: pieces = (3000 − 80) ÷ (length + 3), rounded down, and material used is pieces × length ÷ 3000. Other inputs give other figures, but the shape stays the same.
The blade has thickness, and the material it turns into chips is gone. To that comes the facing allowance: the sawn end is left rough and slightly out of square, and the length dimension is only achieved once the face has been cleaned up on the lathe. Together they are the loss per piece - the same whether the part is 20 or 200 mm long.
The last stretch of bar stays clamped in the saw vice, or is too short to be held safely. It is material bought, weighed and paid for that never reaches the customer. In a batch that fills whole bars, that end is lost once per bar; in a small batch, once as well - but divided among fewer pieces.
At 20 mm length, the 3 mm lost at the cut is 13 per cent of every piece; at 200 mm, under 2 per cent. A short part does not cost a tenth of a long one, because neither the material nor the time for clamping and measuring divides by length. It is also where sawing from bar stops being the obvious answer: on very short parts, a blank closer to the finished shape changes the arithmetic.
Quantity and part length together tell us whether the batch fills whole bars or leaves one started. Where the customer supplies the material, the length of the bars sent is stated: the same part yields differently from 3 m and from 6 m stock.
Dual-column bandsaw for cutting bar stock and sections up to 560 mm.
Semi-automatic twin-column industrial band saw for 0° cutting of bars, tubes, profiles and heavy blanks. Hydraulic clamping on both sides of the blade, stepless speed control and chip removal deliver stable, accurate cuts with little burr. Its robust build suits it to preparing material ahead of machining.
Semi-automatic dual-column bandsaw with PLC control and automatic hydraulic blade tensioning.
Semi-automatic industrial band saw with a rigid twin-column structure, for accurate cutting of large metal blanks. It handles bars and workpieces of round, square or rectangular section. Hydraulic vices and blade tensioning, sturdy guides and adjustable cutting speed give stability, repeatability and low vibration.
In-house stress relieving on the sawn blank, ahead of machining, for the dimensional stability of the finished part.
Industrial furnaces for controlled heating and heat treatment of parts and blanks: annealing, stress relieving, normalising, hardening or tempering, according to material and thermal cycle. Temperature control and uniform holding inside the chamber support the intended mechanical and structural properties. Two units mean batches can be organised more flexibly and the flow stays continuous.
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