Above about 100 mm the tube stops being easy to cut: a single blade has to travel a long way and the tube itself does not want to turn. A milling type orbital cut off solves it by rotating two blades around a stationary tube, so both sides are cut at once and the section stays round.
When to Use It
- Large diameter tube where a single-blade saw stalls or walks.
- Heavy walls that need a stable, low-vibration cut.
- Lines where the tube must not be rotated during cutting.
- Square and rectangular hollow sections with thick walls.
MR165, MR219 and MR273 cover the orbital range up to ø273 mm at 40–60 m/min; above that the gantry saws take over. Each saw is assembled, wired and run with tube before it ships.
Why orbital cut-off for large diameter
Above roughly ø165 mm, a conventional flying saw needs a very long stroke and a heavy carriage to cut through the full section. An orbital cut-off rotates a smaller blade around the tube instead, so the stroke stays short and the machine stays compact at large diameters.
| Tube size | Typical cut-off | Reason |
|---|---|---|
| ø8–76 mm | Flying cold saw | Short stroke, high cycle rate |
| ø76–165 mm | Flying cold saw, heavy frame | Balance of stroke and cycle time |
| ø165–273 mm | Orbital / milling type | Blade travels around the tube |
| Above ø273 mm | Orbital, twin blade | Two heads cut opposite sides simultaneously |
Cut quality on thick wall
On thick wall, a single blade orbiting the tube removes material progressively, which keeps heat low and the cut square. Twin-blade designs halve the cycle by cutting two sides at once, but need rigid clamping to avoid a step where the two cuts meet.
What the tube end looks like
A milling-type orbital cut produces a machined face rather than a sheared one: no heat-affected zone, no discolouration, and a burr small enough that most products go straight to packing.
Related Products
Looking for something close to this? Flying cold saw · High speed flying cut-off · Orbital cut-off · ERW tube mill line.
