Sheet metal grooving machine
A standard press brake struggles to make a tight-radius bend in thick sheet — the tonnage climbs and the tooling gets exotic. A shallow groove on the inside of the bend line turns that into an ordinary bend. This page explains the geometry, the limits and the trade-offs.
The geometry in one paragraph
Take a sheet of thickness T. Cut a V-groove of depth d along the bend line on the inside of the bend. The remaining ligament is T - d. When the brake forms the bend, the material behaves like a sheet of that reduced thickness: smaller radius, lower tonnage, tighter minimum flange. The groove angle sets where the bend starts, and the two groove faces close against each other as the bend completes — which is why the inside corner comes out crisp rather than rolled.
Why buyers want it
- Small radii on thicker sheet — decorative edges, reveals and crisp corners that an air bend cannot deliver on the same thickness.
- Lower tonnage requirement — a groove lets an existing brake do work it could not otherwise do, without buying a bigger machine.
- Sharp internal corners — signage, trim and architectural work where the corner is the product.
- Hemming and overlapping flanges — thin-ligament bends that close flat.
What it costs you
- Wall thickness at the bend — reduced by design. Acceptable for most formed edges; a structural decision for load-bearing sections.
- An extra operation and handling — groove, then move to the brake, then back. The machine earns its keep at volume, not on one-off parts.
- Cutter wear and setup — groove depth is set by the cutter position; a drifted setup shows up as inconsistent radius along a long bend.
Sizing one for your shop
Working width and working thickness are the two headline numbers: how wide a sheet you can feed, and the thickness range the spindle and cutter will handle. Beyond that, ask about feed speed on stainless (it differs meaningfully from mild steel), whether depth is dial-adjusted or CNC-positioned, and what the machine weighs — a groover that walks on thin sheet produces wavy edges.
How it fits the workflow
In a typical sequence the shear or laser blanks the flat, the groover cuts the bend line, and the press brake forms the bend. It pairs naturally with theguillotine shear and theCNC press brake range — and if your parts are architectural or signage work, the signage industry page shows the same workflow from the part side.
Ask about the sheet metal grooving machine
Send the part you need to bend and we will come back with a configuration and a quote.