Joe,
The general procedures are outlined on our web site.
See the link >
How It Works
Things to remember are,
Material / Machine Table must be Flat
The machined grooved must be a different colour to the material surface
Typically fairly shallow grooves,
0.020" for small designs around 3" high
0.080" for designs around 12"
Experiment with different depths in the software to see how a deeper cut produces fewer lines and less detail.
You must use a V-Bit / Conical Cutter otherwise the width on the lines will not vary
When cutting wood the Line Spacing needs to be 120%+ to leave a small flat region between each line / groove, stopping the wood from going fuzzy.
Engraving Brass, machine the part, paint the grooves / piece black and polish the surface to remove the excess paint. Altenatively, use a 'Blacking Fluid' to etch the brass to black, then polish the surface clean leaving the balck in the grooves.
Hope this helps,
Tony