Tooling cost for a custom wireform: what is actually in the quote

Why two tooling quotes differ

Two suppliers receive the same drawing and return tooling prices that are far apart. One number may cover a program, a set of bend pins and a trial. The other may cover a program, a new gripper, a functional gauge and a full first article report. Neither supplier is necessarily wrong. They have priced different scopes.

On a formed wire part, tooling is rarely a single die. It is a bundle of one-time work: the bend sequence, the tools that touch the wire, the machine setup, the trial and the first article. A CNC former needs a program and a small set of standard tools. A four-slide needs slides, cams and form tools made for the part.

The practical task for a buyer is to make every supplier price the same bundle. That starts with a scope list in the RFQ, not a single line in the quote that says tooling.

The lines inside a tooling charge

A useful wireform quote separates the one-time charge into named lines. The table below shows the lines that appear most often on a CNC formed part, with the question that tests whether each line is real.

The program is part of the tooling

On a CNC wire former, the program holds the bend sequence, the feed length, the tool positions and the overbend that compensates for springback. Writing it is engineering work, not data entry. The programmer has to check tool reach, wire feeding and cut clearance.

The bend count drives this cost more than the part size does. A part with four bends may take a short program and a simple trial. A part with fourteen bends, several changes of plane and a loop may take a full day of programming before the first metre of wire is formed. The program also carries the knowledge of how that wire lot behaved during the trial, which is why a revision is not always a small edit.

Ask whether the program is charged once and whether it stays with the part if the supplier changes. A program that cannot be transferred is a commercial lock, whether or not the supplier intends it that way.

Pins, rollers and form tools

The physical tool line depends on the machine and the wire. A CNC former uses standard grippers, bend pins and cutters, and the job specific items are often small. A four-slide uses slides, cams and form tools that are made for the part, so the line looks more like a stamping tool. A dedicated former sits between the two.

Wire diameter is the variable that most often forces a new tool. A change from 1.2 mm to 2.0 mm wire can need different grippers, a cut tool and a bend pin radius. A material change may keep the tools but alter the overbend and the trial. A finish change should not carry a tooling charge.

Ask who owns the tools, where they are stored and what happens when they wear. Bend pins are consumable in practice. A quote that treats them as permanent tooling and a quote that replaces them from the piece price are not the same offer.

Setup, trial and the first article

Setup is the machine time between a cold machine and a part that holds its angles. It includes installing the tools, setting the feed and cut length, running the first parts and correcting the springback. On a part with tight angular calls, the trial can take longer than the program.

The trial consumes wire, and the wire is part of the cost. Ask how much material is included and whether the trial parts are scrapped or can be used as samples. A supplier who includes a generous trial may be more honest than one who hides the same wire in the piece price.

The first article is a separate deliverable. It should report the dimensions that control assembly, the material certificate and any functional call such as load at a stated length. A first article that reports only the overall length is not proof that the process is capable.

How volume and revisions change the number

Tooling is a fixed cost that has to be recovered over a volume. The same tooling charge looks acceptable over 50,000 parts a year and painful over 200 samples. That is why the volume and the release size belong in the RFQ beside the drawing. They let the supplier choose a route that fits, rather than pricing a production tool for a sample order.

A revision is where the change rule matters. A small bend change may need a program edit and a short trial. A change to the wire diameter or the material may need new tools and a new first article. Put that distinction in the purchase order before the first part is approved, so a later change has a known price rather than a negotiation.

For a long programme, agree a tooling ownership and transfer clause. If the part moves, the program and the part-specific tools should move with it, subject to any outstanding amortisation. A supplier who refuses transfer is telling you something about the commercial relationship, not about the engineering.

What to send and what to ask

Send the current drawing revision, the CAD file, the wire diameter and tolerance, the material grade and temper, the finish, the annual volume, the release size and the destination. Then ask the supplier to split the one-time charge into the lines above.

• Which line is program, which is physical tool, which is setup and which is trial?
• Which tools are standard stock items and which are made for this part?
• Is the first article included, and which dimensions does it report?
• Is the gauge included, and who owns it?
• What is the charge for a bend revision, and what triggers a new tool?
• Does the tooling transfer if the part moves to another supplier?