Product Manufacturing Costing

A: 316L looks expensive on the BOM, so it's tempting to chase coated carbon steel or downgrade to 304. The epoxy option feels attractive on purchase price, but the failure mode shifts to coating holidays and underfilm corrosion — rework and scrap spike fast. Duplex 2205 does suppress SCC well, yet you're paying for strength you don't need; the cost delta doesn't close over the duty cycle. 304 is the classic adjacent-domain trap: chloride level and temperature together push it into SCC territory, so unit cost savings vanish once leakage drives recalls.

A: Doing fit-up first feels lean, but it hides tolerance stack-ups until scrap is baked in. Cert-only review assumes paperwork equals reality — that's how borderline parameters slip through. Load testing early burns time and fixtures while still risking rework. The GA-to-part dimensional check up front is cheap and fast, then certs close the material risk, and only then does fit-up make sense for cost containment.

A: Investment casting sounds like a sweet spot, but the variability pushes secondary ops harder than planned. Die casting only pays if volumes are an order higher; tooling eats the budget early. Additive removes fixtures, sure, yet surface finish and tolerance control drive hidden machining anyway. Straight CNC from billet looks expensive per part, but predictable capability keeps scrap and containment costs flat — that's where the real money sits.

A: Reducing safety factor does save material, and it definitely tightens margins under overload and process spread. What's easy to miss is that GD&T-driven assembly errors live elsewhere — safety factor doesn't fix misalignment or form error. Treating it as a cure-all is how cost-cutting walks straight into warranty claims.