How to Evaluate Supplier Drawings Before You Order

Before sending a purchase order, take fifteen minutes to thoroughly review the supplier's drawing. A quick check can prevent expensive rework or scrap. Focus on dimensions, tolerances, and any notes that affect fit or function.

Start by verifying that all critical dimensions match your design intent. Pay special attention to tolerances: are they realistic for the process? Overly tight tolerances drive cost, while loose ones may cause assembly issues. Cross-reference the drawing's general tolerances block with your requirements.

Next, examine geometric dimensioning and tolerancing (GD&T) symbols. Ensure datums and controls align with your functional needs. For example, a flatness callout on a mounting surface must be achievable. Also confirm material, hardness, and surface finish specifications are clearly stated.

Finally, look for notes about deburring, edge breaks, or plating. These details matter for performance and safety. If anything is unclear, ask questions before ordering. A small upfront effort saves significant downstream headaches.

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