Before requesting a CNC quote, look at the part from the tool’s point of view. Check where the cutter enters, where the stock is held and how critical dimensions can be measured. A CAD feature that is easy to model can be hard to reach once the part is clamped.
Check access and internal corners
A rotating milling cutter leaves a radius at an inside corner. If a square mating part has to fit into a pocket, review whether the mating part can be relieved or the pocket can use a local clearance feature. Where the corner does not control fit, allow a radius that gives the manufacturer room to choose a practical tool.
Review deep pockets and thin walls
A deep pocket with a small corner radius can force the use of a long, slender cutter. Tool deflection can affect finish and dimensional control. Consider widening the pocket or increasing its internal radius where the assembly allows. On thin walls, identify which faces are critical and leave room to discuss the machining and workholding sequence.
Mark setup and inspection priorities
Group related features by the faces and datums that control assembly. On a mounting block, for example, the hole pattern and its position relative to the mounting face may matter more than a non-mating outside edge. Send both the model and the drawing with the same revision.
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