For Switzerland, EDM cut components sit inside a longer supply chain, and a small dimensional error at the machine shop becomes a large assembly problem downstream. The notes below are aimed at Energy Sector Buyers sourcing for the 2026 production season, and they focus on the details that decide fit, finish and cost.
Surface treatments and coatings carry their own documentation, so keep the process certificates on file for the programme. Request material certificates, dimensional reports and, where relevant, first article inspection reports with the shipment. Traceability claims need heat numbers or lot numbers that follow the parts through every operation. Confirm that the test house is accredited and that the report names your material or your part, not a generic specimen.
Most quotation gaps come from a different material grade, a different finishing route or a different inspection level, not from shop margin. Setup cost is spread across the batch, so a small batch carries a disproportionate share of programming and tooling time. Ask for a cost breakdown by operation; it turns a price argument into a process conversation. Ask what the price would be at double the quantity; the answer shows you how much of the quotation is fixed cost.
Request the process plan and the inspection plan before you pay the deposit, so you can see how the part will be made and measured. A supplier that can show recent EDM cut components inspection reports is a safer partner than one that only shows photographs of finished parts. Ask for two customers already running EDM cut components programmes and speak to them directly. Find out whether the shop runs a formal first-article process or simply measures the first good part and ships it.
Label every carton with the part number, revision, lot and quantity so that receiving is quick and accurate. Plan the sailing, not the shipping date: the production calendar should work backwards from the arrival window. Cartons for EDM cut components should be specified with the board grade, the internal packing method and a drop-test requirement. Confirm who arranges the export documents and the certificate of origin, because that task is often assumed by both sides.
Keep a golden sample sealed at the supplier and a matching reference in your own store. 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.
A good EDM cut component starts with the hardened tool steel or carbide, so agree the grade, the temper and the certificate before you discuss price. 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. For EDM cut components, the process matters as much as the material: watch the electrode wear and flushing.
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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