What turned-parts shops make and for whom
Screw machine and Swiss shops make small round parts in volume. A single bar-fed machine can run unattended for long stretches, so the business is about tooling life, setup efficiency and keeping spindles cutting.
Customers send annual forecasts and blanket purchase orders, with releases and scheduled shipments. Margins depend on piece price against cycle time, scrap and tooling cost, so small errors in the estimate repeat on every part shipped.
Quoting and costing realities
Quotes for repeat volume work depend on cycle time, bar stock yield, tool changes, secondary operations such as grinding, plating or heat treat, and packaging. Material price swings in brass, stainless and aluminum bar stock often need to be passed through under agreed terms.
The risk is quoting from a theoretical cycle time and then running a slower actual one. Comparing quoted cycle time to actual machine data across past jobs shows which part families are underpriced.
- Quoted versus actual cycle time per part number
- Scrap and setup scrap by machine and material
- Material surcharge and bar stock price tracking
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Turned Parts RFQ Request for Quote Template
A clean RFQ for turned, screw machine and Swiss parts that asks the supplier for exactly what it needs to price: material, tolerances, finish, quantity breaks and certifications.
ERP and quality systems
Shops in this segment commonly use job-shop and manufacturing ERP such as E2 Shop System, JobBOSS, Global Shop Solutions, Epicor and Infor SyteLine, with machine monitoring layered on for spindle utilization. Automotive customers add PPAP, control plans and SPC data to the picture.
A recurring issue is scheduling against customer releases while handling lot-based traceability for medical or automotive parts. Releases, inventory, secondary operations and inspection results need to connect to a single lot record or the audit trail breaks.
Compliance and data handling
Medical, automotive and aerospace customers audit lot records, calibration and corrective actions. Customer drawings and specifications are usually confidential and sometimes export controlled, so shops are cautious about where they are stored and processed.
A model hosted on the shop's own hardware, reading read-only from ERP and a quality document store, keeps this data in the shop's environment. Compliance obligations still sit with the shop, not with the software.
Where private AI helps and where it does not
Good fits include answering questions such as which customers' releases are at risk, which part numbers have the worst scrap history, and where a given specification or corrective action is documented. It also helps summarize customer quality requirements and audit findings.
It is not a substitute for machine monitoring or SPC software, and it cannot improve data that is never captured. A shop with clean ERP data and simple dashboards may not need it.
Frequently asked questions
What is the PMPA?
The Precision Machined Products Association is a US trade association for companies that make precision turned and machined parts, an industry long known as screw machine products. It runs member events and benchmarking and connects shops with suppliers and peers.
What kind of parts do PMPA member shops make?
Mostly small, round, high-volume components such as pins, fittings, valve parts, fasteners and medical screws, made on multi-spindle automatics, Swiss-type lathes and CNC turning centers for automotive, medical, fluid power and electronics customers.
Which standards matter to precision turned parts suppliers?
It depends on the customer. Automotive work typically requires IATF 16949 and PPAP, medical work ISO 13485 and lot traceability, aerospace work AS9100. ISO 9001 is a common baseline, and SPC capability evidence is requested across sectors.
Can ERP data be used to find underpriced part numbers?
Yes, if actual cycle times, scrap and material costs are recorded against each job. Comparing quoted and actual figures across past jobs shows which part families lose money. The analysis can be done in a report or with a read-only AI query over the ERP.