Procurement teams in Switzerland increasingly treat EDM cut components as a strategic buy rather than a spot purchase, so supplier readiness matters more than the last percentage point of price. The notes below work as a checklist for Engineering Procurement Teams that need a part which meets the drawing and still hits the target cost.
Track the reject rate by characteristic rather than only in total, so you can see whether the process is drifting. Book a first article inspection before the run is released, and require the report to list every dimension against the drawing. For critical programmes, put a dimensional report in the carton so that receiving can verify the lot without opening the packing. Keep a golden sample sealed at the supplier and a matching reference in your own store.
Freight, duty and inland handling can add more than the unit price difference, so compare landed cost rather than ex-works price. Payment terms are part of the price: a discount paid for with a larger deposit is not a discount. Most quotation gaps come from a different material grade, a different finishing route or a different inspection level, not from shop margin. The price of EDM cut components breaks into material, machining time, setup, finishing, inspection and margin, and only some of those move with volume.
For high-value parts, agree the packing layout so that no two machined surfaces touch in transit. Cartons for EDM cut components should be specified with the board grade, the internal packing method and a drop-test requirement. Plan the sailing, not the shipping date: the production calendar should work backwards from the arrival window. Label every carton with the part number, revision, lot and quantity so that receiving is quick and accurate.
Ask for quality system documentation such as ISO 9001, IATF 16949 or AS9100, dated and covering the site that will run your parts. Confirm that the test house is accredited and that the report names your material or your part, not a generic specimen. Surface treatments and coatings carry their own documentation, so keep the process certificates on file for the programme. Where the part is safety-related, agree the record retention period before production begins.
Cheap substitutes usually appear in the material grade and the finishing step, so inspect those areas first. Ask for the mill certificate rather than a description of the alloy, because the certificate is the only document that travels with the parts. State the material standard, the temper condition and the traceability requirement by number, not by adjective.
Discuss deburring explicitly, since unstated edge requirements are the most common cause of disputes on machined parts. Ask how the part will be held during machining, because fixture design usually decides whether a tolerance is repeatable. For thin-wall or long parts, agree in advance how distortion will be managed, because that is where capability is really tested. Tolerance is a cost driver, so release only the tolerances the function demands rather than the tightest number that fits on the drawing.
The five controls are simple: revision, first article, inspection, packing and documents. Get them right and you remove most of the risk from a EDM cut components programme.
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