When this applies
- You know what you need but not who makes it
- Quotes you have received vary wildly
- The original process is unavailable at your quantity
- You need advice as much as a price
Matching form to process
Solid parts with bores, threads and tight fits go to machining. Flat or folded parts go to sheet metal. Frames, guards and structures go to fabrication and welding. Originally cast or moulded parts at low quantity are often machined from solid instead, because tooling cannot be justified for a handful of pieces.
- Prismatic and precise — CNC machining
- Flat, cut and folded — sheet metal fabrication
- Structural and joined — fabrication and welding
- Originally cast or moulded, low quantity — machined from solid
Substituting the manufacturing method
A part originally die-cast can usually be machined from billet for a small quantity, and is often stronger for it. Say in the enquiry that you are open to an alternative method — it frequently turns an impossible tooling cost into a straightforward job.
Comparing quotes fairly
Quotes diverge when shops assume different things. Give every shop the same package, ask for price breaks at the quantities you would realistically buy, and ask what each price includes: material certification, inspection, finishing and freight.
RFQ checklist
Include these in your request and suppliers can quote without a round of questions.
- Overall size, weight and material
- What the part does and what it mounts to
- Quantity now, and price breaks you want to see
- Finish or coating requirement
- Whether you are open to an alternative process