For CNC sheet metal bending in Ahmedabad, Layer X runs a 160-tonne CNC press brake at our Satellite facility that holds a bend-angle tolerance of ±0.3° across a maximum bend length of 3200mm. This is a bending-focused capability — distinct from our broader Gujarat fabrication offering — built specifically for the enclosures, chassis, and bracket assemblies that western India's electronics, instrumentation, and machine-building firms need bent accurately and repeatably. If your part comes off a laser as a flat blank and has to become a folded, dimensionally-correct enclosure, this page is about the machine and the physics that make that happen well.
Bending looks simple from the outside — clamp a sheet, push a punch into a die, get a fold. In practice, every accurate bend is a negotiation between material grade, thickness, inside radius, and a stubborn phenomenon called springback. Get the allowances wrong and a four-bend box won't close, holes drift off their mating pattern, and a stack-up of small angular errors turns into millimetres of misalignment at the far corner. Below we set out how we hold tolerance, how to specify a bend radius that your material can actually survive, and why single-source cutting-plus-bending removes an entire category of error.
What our press brake can actually do
The headline numbers matter because they define what geometry is feasible before you commit CAD. Our CNC press brake is a 160-tonne machine — that press force sets the ceiling on how thick a sheet, and how long a bend, we can form in a single stroke. The longer the bend and the thicker or harder the material, the more tonnage per metre it demands, which is why maximum thickness drops as strength rises.
| Parameter | Capability | Note |
|---|---|---|
| Bend-angle tolerance | ±0.3° standard | ±0.1° achievable on single-material, single-thickness runs with dedicated tooling |
| Press force | 160 tonnes | Enables multi-stage bend sequences in one setup |
| Maximum bend length | 3200mm | One continuous fold in a single stroke |
| Max thickness — mild steel | 12mm (lighter grades) | Structural bends, machine frames |
| Max thickness — stainless steel | 8mm | 304/316 food-grade and corrosion-resistant work |
| Lead time | 7–14 days | Combined laser-cut and bent orders under one schedule |
| Price from | ₹500 per setup | No minimum order quantity |
The ±0.3° figure is verifiable, not aspirational — bent components are inspected with a digital angle gauge and a certificate is supplied on request. That verification sits inside our ISO 9001:2015 quality system, alongside the AS9100 Rev D, ISO 13485:2016, REACH and RoHS certifications the wider studio holds. Across every process we run, first-pass yield sits at 99.4%, and the studio has shipped 2,000+ parts to 240+ active clients.
Bend radius: the number engineers most often get wrong
The single most common bending problem we see is an inside bend radius specified too tight for the material. When the radius is smaller than the material can tolerate, the outer fibre stretches past its limit and the metal cracks along the bend line — or, in ductile alloys, it thins dangerously and fails in service. As a working rule, the minimum inside radius should be at least equal to the material thickness for soft mild steel, and larger for harder or work-hardened alloys such as 5052-H32 aluminium or 316 stainless.
Two practical consequences follow. First, if you leave the radius unspecified, we form to the natural radius produced by the punch and die combination for that thickness — which is almost always the most reliable choice, so let the tooling pick it unless you have a functional reason not to. Second, keep the radius consistent across a part. Every distinct inside radius can mean a distinct tool change, and a fresh setup adds cost. Designing to one radius family keeps your ₹500-per-setup count down.
For the underlying flat-pattern mathematics — bend allowance, bend deduction, and the K-factor that locates the neutral axis inside the sheet — the German standard DIN 6935 (bending of cold-rolled steel flats) remains the reference most fabricators calculate against. We walk through those calculations in our bend allowance and K-factor guide, and cover the mechanics of springback in the press-brake bending guide.
Springback, and why we overbend on purpose
Steel and aluminium are elastic before they are plastic. When the punch retracts, the material relaxes and springs back open by a small angle — typically a degree or two, more in high-strength and aluminium grades. If you form exactly to 90°, you get 91° or 92° once the part is unclamped. The fix is deliberate overbending: we form past the target so the part settles onto the specification after release. A CNC press brake makes this repeatable because the ram depth is programmed and consistent across the run, which is precisely how the ±0.3° tolerance is held across a batch rather than drifting part to part.
Springback is why single-thickness, single-material runs earn the tighter ±0.1° tolerance: with one springback figure to compensate for, the overbend can be dialled in exactly. Mixed thicknesses in the same job each carry their own springback behaviour, which is the honest reason the standard tolerance is ±0.3° rather than a single flattering number.
Tolerances: stacking, datums, and where error hides
An individual ±0.3° bend is tight. The trap is accumulation. On a part with four sequential bends, angular errors and edge-location errors compound, and a hole pattern referenced from the wrong edge can land several millimetres out at the opposite flange. Two design habits contain this:
- Reference features from a single datum edge, not from a bent flange, so tolerance does not stack through every fold.
- Keep holes and cut-outs away from bend lines — a feature too close to the fold distorts as the material stretches around the radius. A safe distance of roughly 2.5 times material thickness plus the bend radius keeps holes round.
For general untoleranced dimensions, the international reference is ISO 2768 (general tolerances for linear and angular dimensions), which lets you call a tolerance class on the drawing rather than dimensioning every feature. Applying GD&T against a clear datum scheme — the subject of our cross-process tolerances guide — turns a vague drawing into one we can inspect against unambiguously.
CNC sheet metal bending in Ahmedabad: why single-source matters here
This is the argument for doing your CNC sheet metal bending in Ahmedabad under one roof rather than splitting cutting and folding across two vendors. Our CNC fibre laser cutting service and our press brake sit in the same building. A flat profile is laser-cut — mild steel to 16mm, stainless to 12mm, aluminium to 10mm, holding ±0.1mm on profile dimensions with a kerf of 0.1–0.25mm — and goes straight to bending as one order. No shipping flat blanks to a second shop, no stacked lead times, no argument about who caused a misfit at the join.
That single point of accountability is the real deliverable. When the same team cuts the blank and bends it, the bend-line callouts, the hole-to-fold clearances, and the datum edges are all reconciled before the first cut — not discovered as a mismatch after two suppliers have each done their bit correctly in isolation. For Gujarat's electrical-panel builders, HVAC fabricators, food-processing OEMs, and instrumentation firms, that is the difference between an enclosure that closes first time and one that comes back for rework.
Material selection for bent parts
Bendability and end use travel together. The grade you pick decides your minimum radius, your springback compensation, and whether the finished enclosure survives its environment. Here is how we match the four families we bend most:
| Material | Typical use | Bending note |
|---|---|---|
| Mild steel | Structural bends, machine frames — high volume | Most forgiving; minimum radius near one thickness |
| Stainless 304 / 316 | Food-grade and corrosion-resistant enclosures | Higher springback; needs more overbend and force |
| Aluminium 5052 / 6061 | Lightweight enclosures, instrument panels | 5052 bends well; 6061-T6 needs a generous radius to avoid cracking |
| Pre-galvanised steel | HVAC and electrical panel work | Bend to preserve the zinc coating; avoid tight radii that flake it |
For electronics housings, one detail beyond dimensions matters: EMI shielding continuity across the bend. A fold that maintains metal-to-metal contact and consistent gaps keeps a Faraday enclosure electrically continuous — a design concern we treat as part of the bend specification, not an afterthought. If you are still weighing folded metal against a printed housing, our enclosure decision guide lays out the trade-offs.
What to send us for an accurate quote
The fastest path to a firm price and a right-first-time part is a clean file. In order of preference:
- A 3D STEP file with bend radii noted — this gives us geometry and intent together.
- A flat-pattern DXF (from SolidWorks or CATIA) with bend lines and directions marked.
- A 2D engineering drawing (PDF) with full GD&T, datums, and material grade and thickness called out.
Always state material, thickness, grade, finish, and quantity. If bends share a common inside radius, say so — it lets us minimise tool changes and keep the setup count, and therefore the cost, down.
Ahmedabad-based, shipping pan-India
Layer X operates a single facility at 204, Iscon Emporio, Satellite, Ahmedabad 380015 — there are no branch shops elsewhere. That concentration is deliberate: cutting, bending, and inspection under one ISO 9001 roof with one team of 48 is what lets us hold ±0.3° repeatably and quote inside 24 hours. Being in Ahmedabad puts us next door to Gujarat's dense manufacturing base, and the same single-source workflow ships bent assemblies pan-India. For the broader picture of laser-plus-press-brake fabrication across the state, see our Gujarat sheet metal fabrication overview; for the bending capability itself, the details live on our CNC sheet metal bending service page.
Ready to move? Upload your CAD file for a 24-hour quote — send a STEP or DXF with your bends marked and we'll come back with price, lead time, and any DFM notes on radius or tolerance before we cut a single blank.