Developed Length and Material
Start with the developed length: the straight wire length needed to produce the form, including each bend allowance and any tails that get trimmed. CAD of the part or a flattened sketch gets you close, but the shop's real number comes from the first article, so build a table of developed-length corrections by wire diameter and bend radius. Multiply by weight per inch for the material (low-carbon, high-carbon, stainless, music wire, or coated wire) and by cost per pound.
Add a yield factor for lead and tail cutoff. Remember that wire is often bought by coil or spool, so a small order on an unusual diameter can force you to buy more than the job consumes.
Setup Time on a CNC Wire Former
On a CNC wire former, setup includes loading the program, adjusting feed and straightener rollers, installing or adjusting forming tools, and running first articles until the part checks. New parts need programming time, and complex forms with many axes of motion can consume a shift before the first good piece. Repeat parts with a saved program and tooling in a labeled rack set up quickly.
Your estimate should separate new-part programming (charged as NRE or amortized) from repeat setup, and should show which quantity breaks absorb which setup cost. Estimators who lump both into a single setup hour underprice new parts and overprice repeats.
- New program and tooling versus repeat setup
- First-article inspection and customer approval time
- Fixtures or gages needed for checking the form
Cycle Time, Machine Rate and Scrap
Cycle time depends on the number of bends, wire size, and the machine's feed speed, and real throughput is lower than the programmed cycle because of stoppages, wire changes and inspection. Use actual pieces per hour from the last time you ran a similar part on that machine, not a theoretical number. Apply a burdened machine rate that includes labor, depreciation, power and floor space, and keep a separate scrap allowance for start-up pieces and in-process rejects.
Scrap on tight-tolerance parts or hard stainless can be several times what it is on soft, forgiving forms, so estimate scrap by family rather than using one number across all parts.
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Turned Part Secondary Operations Cost Worksheet
Add each secondary operation with setup, per-piece price and vendor minimum charge to get the extended cost, cost per part and total lead time.
Secondary Operations Add Up Quickly
Wire forms rarely ship straight from the former. Common secondary operations include resistance or MIG welding, tack or spot welding to join ends, heat treat or stress relief, tumbling and deburring, tapping or threading, plating or powder coat, and assembly with other components. Each carries setup and handling time, and welding or plating may be outsourced with lead time and minimum charges.
List each as a separate line in the estimate and track cost per piece from the actual work order after the job completes, so the next estimate of the same operation starts from real data. Outside processing minimums are a frequent source of margin loss on small lots.
Using Job History and AI to Tighten Estimates
The most valuable data for a wire form estimate is what similar parts actually cost. In most ERPs that means work order actuals: material consumed, machine hours, scrap, and outside processing invoices by job. A private AI assistant over that data can match an incoming print to similar prior jobs and draft the estimate for a human estimator, citing the jobs it used.
It is probably overkill if you quote a small number of repeat forms and already keep a good job-cost spreadsheet. It is valuable when estimates vary by who writes them, or when you cannot easily see actuals by part family.
Frequently asked questions
How do I estimate the cost of a bent wire part?
Calculate developed wire length and material cost with a scrap allowance, add setup divided by lot size, add cycle time at a realistic machine rate, then add secondary operations such as welding, heat treat and plating. Finally apply overhead and margin by quantity break.
Why do wire form quotes lose money on small lots?
Setup, first-article approval, wire minimums and outside processing minimums are fixed costs. On a small lot they dominate. Quoting with an explicit setup or minimum charge protects margin.
What is a normal scrap rate for wire forming?
It varies widely by wire material, diameter, and tolerance. Soft low-carbon forms can run with low scrap, while hard stainless or tight-tolerance forms scrap more. The reliable answer is to measure your own scrap by part family from past work orders.
Netray can index your wire form job history on your own servers and draft estimates that cite the jobs they were built from, with your estimator approving every number.