A flying cold saw cuts the tube while it is still moving, with a toothed blade instead of a friction disc. The cut end comes off square and burr-free, with no heat-affected zone, so the next process — threading, galvanizing, welding, powder coating — can start without a separate trimming station. For most lines it also removes the double-cut and the end crop that a hot saw demands.
MR Series Cut-off Units
| Model | Tube OD (mm) | Wall (mm) | Max line speed (m/min) | Type |
|---|---|---|---|---|
| MR25 | ø8–25 | 0.5–1.5 | 120 | High-speed flying saw |
| MR32 | ø8–38 | 0.5–1.5 | 120 | High-speed flying saw |
| MR165 | ø76–168 | 1.5–7.0 | 60 | Orbital, twin blade |
| MR219 | ø89–219 | 2.0–8.0 | 40 | Orbital, twin blade |
| MR273 | ø102–273 | 2.5–12.0 | 40 | Gantry, twin blade |
| MR377 | ø140–377 | 3.0–15.0 | 35 | Gantry, twin blade |
How to Choose a Model
Start from the largest tube you will cut and the heaviest wall — both decide the blade size and the clamping force. Then check line speed: a high-speed small-tube line needs a light carriage that accelerates with the tube, while a large-diameter line needs a stiff gantry that holds the blade steady through a 15 mm wall. If you are between two models, send us the wall range and we will tell you which one actually holds tolerance at your speed instead of selling you the bigger machine.
Built and Run-In In-House
Each saw is assembled, wired and run on our own bench before it is packed: carriage tracking, clamp pressure, cut length repeatability and blade changeover are all checked with tube on the machine. Blade supply (HSS and TCT) and the wear parts that follow are stocked, so a saw does not sit idle waiting for a consumable.
What the Cut End Actually Has to Deliver
A saw is judged on numbers, not on the sound it makes. Four of them decide whether the next process runs smoothly:
| Parameter | What good looks like | What it affects |
|---|---|---|
| Squareness | Within 0.2 mm on a 50 mm tube, measured across the end | Welding fit-up, threading, automatic assembly |
| Burr height | Under 0.1 mm external, no internal lip | Handling injuries, coating defects, thread damage |
| Cut length tolerance | ±1 mm at line speed, repeatable | Material yield, downstream setting |
| End face finish | Clean tooth marks, no blue or burnished band | Whether a second trimming operation is needed |
If a quotation does not mention these four, the saw is being sold on blade diameter and motor power. Both matter, but neither tells you what comes off the line.
Where the Tolerance Comes From
Cut length error on a flying saw has three sources, and they are separable. The measuring encoder or the tube stop sets the target; the clamp decides whether the tube moves while the saw is cutting; the carriage decides whether the saw is actually travelling at tube speed when the blade enters. A saw that cuts short on acceleration and long on deceleration is a carriage problem. A saw that varies at constant speed is a clamp problem. A saw that is consistently off by the same amount on every piece is a calibration problem, and the easiest of the three.
Fitting a Cold Saw to a Line That Was Not Designed for One
Retrofitting is common, because a friction saw is usually the first thing an owner wants to replace. The four things that have to be checked before quoting:
- Line speed: the saw carriage has to accelerate to tube speed within the distance available before the cut.
- Space: a cold saw needs a longer carriage stroke and a chip collection area than a friction saw.
- Tube support: a cold saw cuts with force, so the tube needs support either side of the cut.
- Controls: the saw needs a speed signal from the mill, and the mill needs a “saw busy” interlock, or the tube will pile up.
A retrofit that ignores the fourth item produces a saw that works perfectly and a line that stops every cut.
Blade Cost per Cut, Not Blade Price
A blade is a consumable with a cost per cut, and cheap blades usually lose on that number. The variables are tooth pitch against wall thickness, cutting speed against material, coolant quality, and how the blade is broken in. A blade run too fast on stainless will glaze and stop cutting; the operator then pushes harder, which shortens life further. Ask for the recommended surface speed for your material and write it on the setup sheet.
From the Knowledge Centre
- Flying Cold Saw vs Friction Saw
- Saw Blade Life: Seven Variables
- Cut Length Tolerance: Encoder, Clamp and Carriage
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