Drawing and DFM
Decision: The drawing revision, material, annual volume and critical characteristics are agreed before quotation.
Evidence: A dated DFM issue list and a quotation built on the confirmed process route.
Quality evidence · Drawing to release
A part is not released because it looks right. It is released when the drawing, process route, tooling, measurements and documents agree — and when the buyer can audit the evidence behind them.
At Balford, quality evidence follows one controlled path from drawing to release. Before quotation, engineering reviews the drawing, material and forming route. Before tooling, the approved drawing defines datums, critical characteristics, general tolerance, finish and inspection method. Tooling is designed and built in-house, with slow-wire EDM disclosed as an outsourced operation where used. First-off parts are measured against the confirmed drawing, and first article inspection reports actual values rather than certificates alone. For automotive programmes, a PPAP-aligned package is prepared at the agreed level, normally Level 3 for a new programme. Material certificates are traceable to the heat or coil; IMDS is provided on request; inspection records are retained per lot. A 0.01 mm callout is considered only for selected critical machined features and must be confirmed from the drawing.
Decision: The drawing revision, material, annual volume and critical characteristics are agreed before quotation.
Evidence: A dated DFM issue list and a quotation built on the confirmed process route.
Decision: Grade, temper, surface condition, heat treatment and finishing are fixed before tooling is released.
Evidence: Material certificate traceable to the heat or coil, and a route that names every partner operation.
Decision: Die design, station sequence and trial conditions are controlled by the same engineering team.
Evidence: Tooling record, trial samples and measured first-off parts against the approved drawing.
Decision: Every new part is measured against the confirmed drawing before production release.
Evidence: FAI report with nominal, tolerance and actual values, plus material and finish records where applicable.
Decision: The customer's required submission level and compliance route are set at quotation.
Evidence: PPAP-aligned package at the agreed level, normally Level 3 for a new programme; IMDS on request.
Decision: Inspection follows the agreed control plan rather than a promise to check everything at the end.
Evidence: Records retained per lot, with finish, packing and traceability information available on request.
| Document | When | What it establishes |
|---|---|---|
| DFM issue list | Before quotation | Drawing risks, missing information and process changes that affect tooling or price |
| Approved drawing | Before tooling | The controlled revision the part and inspection plan are built against |
| Material certificate | With first article and production | Traceability to the heat or coil, with grade and condition |
| First article inspection | On first-off samples | Nominal, tolerance and actual values against the drawing |
| PPAP-aligned package | At the agreed level | Documents assembled to the customer's required submission |
| IMDS entry | On request | Material data filed where the customer system requires it |
| Lot inspection records | Through production | Results retained per lot and available on request |
| Finish and process records | When applicable | Coating, plating, heat-treatment or other partner-process evidence |
Balford publishes three consecutive parts of a deep-drawn magnetic isolation sleeve measured by the customer on a ZEISS Calypso CMM. The reports show fitted diameters, two-point diameters, roundness and coaxiality against the drawing limits. They are the customer's incoming inspection documents, not a Balford marketing report.
This is also a useful boundary: Balford does not claim an in-house CMM. When a programme requires formal CMM verification, the measurement source and route are agreed before quotation.
Every new part starts with first article inspection against the confirmed drawing. For automotive programmes a PPAP-aligned package is prepared at the agreed level, normally Level 3. Material certificates are traceable to the heat or coil, IMDS is filed on request, and lot inspection records are retained.
No. Balford is certified to ISO 9001:2015 and runs process controls aligned with IATF 16949 requirements. The quotation and PPAP documents state the difference rather than presenting alignment as certification.
The quotation names the partner operation when it is part of the route. Heat treatment, slow-wire EDM, passivation, electropolishing, plating, phosphating, liquid painting and e-coating are managed with qualified partners; incoming results and process records are checked where the drawing or control plan requires evidence.
No supplier measures every drawing dimension on every lot. The control plan identifies significant characteristics, method and frequency. First article inspection is the full layout against the drawing; production inspection follows the agreed plan and records are retained per lot.
Yes. Drawing requirements, FAI and PPAP documentation, material traceability and the inspection method can be discussed during RFQ. Where a part needs a formal CMM report or third-party test, say so before quotation so the route and cost are included.
The detailed rules sit on the PPAP and FAI, drawing requirements, in-house tooling, inspection lab, equipment list, IMDS process, quality and certifications and supplier network pages.
To see the evidence applied to representative sensor, solenoid and motor envelopes, open the housing specification and engineering evidence library.
Send the controlled drawing, material, annual volume and the characteristics that decide fit. The review starts with whether the part can be made as drawn; the documentation follows that route.