{"id":775,"date":"2026-10-12T11:02:40","date_gmt":"2026-10-12T03:02:40","guid":{"rendered":"https:\/\/www.ypmfg.com\/guides\/dfm\/"},"modified":"2026-10-12T11:02:40","modified_gmt":"2026-10-12T03:02:40","slug":"dfm","status":"publish","type":"page","link":"https:\/\/www.ypmfg.com\/es\/guides\/dfm\/","title":{"rendered":"CNC Design & Tolerance Guide"},"content":{"rendered":"

A practical review checklist for machined parts. These are general design recommendations; achievable features and inspection requirements are confirmed for each project.<\/p>\n

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Tool access and internal corners<\/h2>\n

Milling cutters are round, so internal corners generally require a radius. Allow space for the cutter and its holder, especially in deep pockets. Small corner radii and deep narrow features can increase machining time. Identify corners that must remain sharp so a suitable process can be discussed.<\/p>\n<\/section>\n

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Walls, pockets and support<\/h2>\n

Thin walls can deflect during cutting or finishing. Keep wall thickness reasonably consistent, avoid unsupported features where possible, and discuss long or slender parts early. A more open pocket can improve tool access and chip removal. No single wall thickness suits every material and geometry.<\/p>\n<\/section>\n

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Holes and threads<\/h2>\n

Use standard hole and thread sizes where your application allows. Specify thread standard, size, pitch, required engagement and whether a hole is blind or through. Leave room beyond the usable thread for tool entry and clearance. Deep holes may require additional process planning.<\/p>\n<\/section>\n

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Tolerances and datums<\/h2>\n

Apply tight tolerances only where function requires them. Mark mating faces, critical dimensions and datum references on the drawing. State the applicable drawing standard and revision. A 3D model alone may not communicate fits, geometric tolerances or inspection requirements.<\/p>\n<\/section>\n

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Surface finish and coatings<\/h2>\n

Identify cosmetic surfaces, allowable tool marks, roughness requirements and masking areas. Coatings can affect dimensions and fits; specify whether critical dimensions apply before or after finishing. Discuss colour, texture and appearance references before ordering.<\/p>\n<\/section>\n

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Pre-production checklist<\/h2>\n