Capability 01 — Flagship
CNC
V-Grooving
A controlled channel milled along the bend line before forming, so the sheet closes to a far smaller radius than a press brake alone can produce. It is the single operation that most changes how a folded architectural profile looks.
The difference
Drag the divider. The corner is the whole argument.
Conventional bend
V-grooved bend
The evidence
Where the groove does the work
A channel milled along the bend line before forming lets the sheet close to a far sharper external corner than a press brake alone can reach. These are our own parts, photographed on the floor.
How it works
Three operations, in this order
Cut flat
The developed blank is laser cut from flat sheet, including any perforation or pattern. Bend allowances are calculated for the grooved condition, not the plain one — a groove changes the developed length, and getting that wrong is the usual reason a folded section comes out short.
Groove the bend line
A V-shaped channel is milled along the inside of each bend line, leaving a controlled web of material. Groove angle and remaining web thickness are set from the sheet thickness and the finished angle required.
Fold
With less material in the way, the sheet closes into the groove instead of wrapping around a tool radius. The external corner arrives sharp, and the visible face is not stretched or marked the way a tight conventional bend would leave it.
Why specify it
What changes on the finished detail
V-grooving is worth specifying where the corner is visible and close. Where a profile is concealed or high above the sightline, a conventional bend is the sensible choice — and MCS will say so.
Sharper external corners
The arris reads as a machined edge rather than a fold, which is what separates an architectural profile from a fabricated one.
Smaller bend radius
Tighter geometry than the tooling alone would allow, so sections can be shallower and legs shorter.
Cleaner joints
Mitres and returns close tighter, so there is less to fill, grind and disguise before finishing.
Less face deformation
The visible surface is not dragged over a tool radius, which matters on mirror and hairline finishes where any distortion shows.
Repeatable across a run
The groove is machined to a programme, so the hundredth length matches the sample.
Better base for coating
A crisp, undistorted corner takes PVD and powder coating more evenly than a stretched one.
Where MCS uses it
Products built on this operation
Capacity
Machine specification
| Process | CNC V-grooving, long-format |
|---|---|
| Materials | Stainless steel, mild steel, aluminium, brass, copper |
| Sheet thickness | 0.25 – 4 mm |
| Processing length | Long-format architectural profiles |
Groove angle, minimum leg length, maximum processing length and web thickness are confirmed per enquiry. They depend on material, thickness and the finished angle, and MCS would rather confirm them against your section than publish a figure that does not apply to it. Contact MCS for project-specific technical data →
What to send
To get a fabrication review
- Section drawing — DWG, DXF or a dimensioned PDF, with leg lengths and internal angles marked.
- Material and thickness, or the condition the detail has to meet if you would rather MCS proposed one.
- Overall length and quantity, including whether lengths must be continuous or can be jointed.
- Finish, and which faces are visible in the installed position.
- Programme — sample date and site date, which often decide the fabrication route.
Start a project
Have a section that needs a sharp corner?
Send the drawing. MCS will confirm groove positions, minimum leg length and whether it folds as drawn.