A sheet metal part is priced operation by operation: cut the flat pattern (by laser, punch or waterjet), bend it on a press brake, press in any hardware, weld if needed, deburr and finish. Cutting is priced from cut length and material; bending from a set-up per tooling change plus a time per bend; and finishing is usually a per-part price with a minimum lot charge. One-off set-ups dominate small batches.
Key points
- Price each operation separately: cut, bend, insert, weld, deburr, finish.
- Cutting the flat pattern is priced like laser cutting, from cut length, pierces and sheet use.
- Bending costs a set-up per tooling group plus a time per bend; large parts take longer per bend.
- Welding is skilled manual work and usually the most expensive operation per minute; avoid it where you can.
- Outsourced finishes carry minimum lot charges that small orders pay in full.
The route of a typical sheet metal part
Most sheet metal parts follow the same route through the shop. Each step is a separate cost line.
| Step | Operation | How it is priced |
|---|---|---|
| 1 | Unfold the 3D model into a flat pattern | Programming time, once per part number |
| 2 | Cut the flat pattern (laser, punch, waterjet) | Cut length, pierces, sheet use, per part |
| 3 | Deburr edges | Time per part, by size and edge length |
| 4 | Bend on a press brake | Set-up per tooling group, plus time per bend |
| 5 | Press in hardware (nuts, studs, standoffs) | Hardware price plus time per insert |
| 6 | Weld, grind and clean | Time per weld length, plus fixturing |
| 7 | Finish (powder coat, plating, anodise) | Usually outsourced, per part with a lot minimum |
| 8 | Inspect and pack | Time per part |
Step 1 and 2: flat pattern and cutting
A bent part starts flat. The 3D model is unfolded into a flat pattern, and the unfolded length of each bend depends on the material, thickness, bend radius and the K-factor, which locates the neutral axis inside the bend. Getting it wrong puts flanges in the wrong place, so shops keep a K-factor table for each material, thickness and tool set.
The flat pattern is then cut, usually on a laser. Pricing works as described in our guide to laser cutting cost: cut length divided by speed, a time per pierce, and material charged by the share of the sheet the part uses. How well flat patterns nest matters here; bent parts often have awkward L or U-shaped flats that nest poorly, and our article on nesting and material utilisation shows what that costs.
Step 4: bending
Bending has two cost components.
Set-up. The press brake is fitted with a punch and die for the material, thickness and inside radius, and the back gauge is programmed. A part whose bends all use the same tooling needs one set-up. A part with a short flange that needs a narrower die, or a tight radius that needs a different punch, needs a second tooling group: either a change during the batch or a separate set-up. This is a fixed set-up cost per batch.
Bend time. Each bend is one stroke: position the part against the back gauge, bend, reposition. Small parts take seconds per bend; large panels need two people and more time. Shops usually price bends by part size class rather than timing every bend.
Bending also has limits that affect whether the part can be made at all. Flanges have a minimum length set by the die opening. Holes too close to a bend distort. Bends that meet at a corner need a bend relief to stop the material tearing. And press brake force (tonnage) rises with the square of the thickness and with bend length, so long bends in thick plate may need a bigger machine. The design for sheet metal guide covers these rules.
Step 5 and 6: hardware and welding
Self-clinching nuts, studs and standoffs are pressed into the sheet. They are priced as the hardware cost plus a short handling time each, and they often replace welded nuts or tapped holes in thin sheet.
Welding is different. It is skilled manual work, needs the parts held in a jig, and is usually followed by grinding and cleaning. Thin sheet distorts with heat, which adds straightening. Because weld time varies so much with the joint, many shops route welded assemblies to an estimator rather than pricing them automatically.
Step 7: finishing
Powder coating, zinc plating and anodising are usually done by a subcontractor, priced per part (often by surface area or size class) with a minimum lot charge. For a batch of fifty the per-part price applies; for a batch of five, the minimum often dominates the quote. The surface finish options guide compares the common finishes.
Worked example: a bent cover at 5 and 50 parts
The figures are illustrative assumptions for one shop, not market rates. The part is a cover in 1.5 mm mild steel with a 300 × 200 mm flat pattern, four bends (three on the standard tooling and one short flange that needs a second tooling group), four pressed-in nuts and a powder-coat finish.
Worked example: per-part and fixed costs (illustrative rates)
| Line | Calculation | Amount |
|---|---|---|
| Laser cutting | 1.2 m cut length, 10 pierces: 0.8 min × €2.00/min | €1.60 |
| Material | 0.30 × 0.20 m = 0.06 m² × 11.78 kg/m² = 0.707 kg ÷ 80% utilisation = 0.883 kg × €1.40/kg | €1.24 |
| Bending | 4 bends × 12 s + 30 s handling = 78 s = 1.3 min × €1.20/min | €1.56 |
| Inserts | 4 × (€0.15 nut + €0.10 pressing) | €1.00 |
| Deburr | 1 min × €0.70/min | €0.70 |
| Powder coat | €3.50 per part, lot minimum €120 | €3.50 |
| Per-part cost, batch of 50 | 1.60 + 1.24 + 1.56 + 1.00 + 0.70 + 3.50 | €9.60 |
| Press brake set-up | 2 tooling groups × 20 min × €1.20/min | €48.00 per batch |
| Programming (unfold, nest, bend sequence) | 1 h × €60/h | €60.00 per order |
| Fixed cost per order | 48.00 + 60.00 | €108.00 |
| Quantity | Calculation | Order cost | Per part |
|---|---|---|---|
| 50 | 50 × €9.60 + €108.00 = €480.00 + €108.00 | €588.00 | €11.76 |
| 5 | 5 × €6.10 + €120.00 coating minimum + €108.00 = €30.50 + €228.00 | €258.50 | €51.70 |
At fifty parts the cover costs €11.76 each; at five, €51.70, more than four times as much. At five parts, the coating minimum and the fixed set-up and programming account for €228.00 of the €258.50 order. The steel itself is about €1.24 a part either way. Notice also that the short flange alone added a second tooling group: €24 per batch that disappears if the flange is lengthened to suit the main tooling.
What drives sheet metal cost up
| Driver | Why | What helps |
|---|---|---|
| Many tooling groups | Each one is a set-up or a tool change | One thickness and one inside radius throughout |
| Many bends on large parts | Time per bend rises with size, may need two people | Fewer, simpler bends; split very large parts |
| Welding | Skilled time, fixturing, grinding, distortion | Tabs and slots, bent corners, fasteners |
| Tight tolerances across bends | Each bend adds variation | Tolerance critical dimensions only, from one datum |
| Small batches with outsourced finish | Lot minimums | Order in larger batches, or accept a raw finish |
| Awkward flat patterns | Poor nesting, more scrap | Allow rotation, nest with other parts |
Pricing sheet metal automatically
Quoting sheet metal from a 3D model means unfolding it, measuring the flat pattern’s cut length and pierces, counting bends and grouping them by tooling, then applying the shop’s rates; welding usually goes to review. Quotometry does not price sheet metal yet: it prices flat laser, waterjet and plasma parts from a drawing, but unfolding and bending are not built (see sheet metal fabrication).
Questions people ask
How is the cost of a sheet metal part calculated?
Add up each operation. Cutting the flat pattern is priced like laser cutting, from cut length, pierces and material. Bending adds a press brake set-up per tooling change and a time per bend. Then come hardware inserts, welding, deburring and finishing, each with its own time or price. Fixed costs per order are divided across the quantity.
Why does the number of bends matter so much?
Each bend is a separate stroke of the press brake with the part repositioned against the back gauge, so time rises with the bend count. Bends that need different tooling, such as a short flange or a tight radius, also need a tooling change or a separate set-up, which is a fixed cost per batch. Large parts may need two operators.
Is welding expensive in sheet metal work?
Welding is usually one of the more expensive operations because it is skilled manual work, needs fixturing to hold the parts, and is often followed by grinding and cleaning. Distortion in thin sheet adds straightening time. Many designs replace welded corners with bent tabs, self-clinching fasteners or rivets, which are cheaper and more repeatable.
How can I make sheet metal parts cheaper?
Use one material thickness and one inside bend radius throughout, so the press brake needs one tool set. Keep flanges long enough for the tooling, keep holes away from bends, add bend reliefs, avoid welding where a bend or fastener will do, and order in quantities that spread the set-up and the finisher's minimum lot charge.
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