A useful casting RFQ allows different suppliers to price the same obligation. Sending only a model and an estimated annual quantity leaves room for different assumptions about machining, material condition and inspection. Those differences often explain a large price spread more readily than the suppliers’ manufacturing efficiency.

A component machined from stock and one machined after casting can look identical at delivery. Their manufacturing economics are different. Investment casting vs CNC machining is therefore best understood as a choice of starting shape and production route, rather than a choice between precision and imprecision.

Two investment castings of similar weight can receive very different quotations. Weight captures only part of the manufacturing effort. Investment casting cost also reflects how the component is patterned, assembled, fed, finished and accepted. Understanding that chain helps a buyer ask useful questions without reducing the conversation to a price per kilogram.