Designing a part so that it can be made efficiently with the intended process.
DFM is a review performed before release, checking that the design respects the process it will be made by. For machining that means avoiding deep narrow pockets, sharp internal corners that cannot be cut because of tool radius, and tolerances tighter than the process can hold.
The internal-corner rule is the one that catches most designs: a pocket corner cannot be sharper than the radius of the end mill that cuts it, so a square corner means either a relief hole or a change to the drawing.
Specifying sharp internal corners. Every cutter has a radius, and a corner sharper than it requires either an EDM operation or a design change.
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