That is called excavating. There are a few solutions.
If the machine is capable do not use a nosecone, but set the depth on the machining program, assuming you can keep the piece perfectly flat.
Use a large depth nose, they are available for most machines.
Use only engraving fonts, the more lines the better. Engraving fonts are designed, (when designed right), to start in the middle and work their way outward.
Philadelphia, PA (Really Bensalem)
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