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Most new parts change several times as they evolve from a conceptual drawing to a physical object in the real world. By the time a new part is ready for prototyping, you’ve made drawings, calculations, and prepared extensive documentation (and if you’re working within the automotive industry, you’ve also spent countless hours on the Production Part Approval Process, or PPAP). And now it’s time for functional testing or evaluating fit within an assembly.
In this age of tightening budgets, purchasers are tasked with sourcing parts economically, and designers and engineers know parts must be cost-effective to manufacture. It’s tempting to think of a stamper merely as a vendor or supplier of materials. After all, if the part meets specification and budget requirements, surely that’s good enough. You might even save money on production.
As OEMs and aftermarket equipment companies tighten tolerances, manufacturers face the challenge of producing stamped parts that meet and exceed their customers’ requirements. Poor die design along with scrapped or reworked parts cost everyone involved time and money. It’s critical to get it right the first time and every time.
Most designers of stamped parts don’t need to be convinced of the value of specifying tolerances as a regular practice. This example in Machine Design illustrates why tolerancing is always a good idea. “A machine shop that sees an untoleranced diameter, without knowing the design intent, may apply a standard tolerance for three-decimal-place untoleranced dimensions, ±0.005 in. [which] may result in interference, where the hole is smaller than the shaft diameter, which prevents the parts from sliding together … if too large of an interference exists, it will degrade performance.” As the article notes, the end result is usually extra time and money to rework the parts.
YONKERS, New York. (September 11, 2019) CEP Technologies Corp. has launched a new website for manufacturers that need custom miniature to small progressive stampings. Streamlined navigation makes the site easy to access for automotive OEMs. The site is also designed to support a diverse group of industries that range from telecommunications, consumer goods and EMI/RFI shielding to electrical switches, medical devices, battery contacts, power protection and oil and gas and market spaces in between.