Hi dave,

To be onest i do not have really any experience with lazer engraving but,
i gave you an example just using a search/engine.

The reason i responded to your question is that i have had some bad experience on
making really small details,using a Perfactory® Mini Multi Lens rapid prototyping machine.
This system uses a Ultraviolet lamp to solidify a photo sensitive resin.

For example when the space inside a font is small then the borders will be overexposed,
and to much resin will solidify leaving a poor result.

Maybe the following machine will do for you:
http://www.artisancnc.com/

I found it on this forum:
http://forum.artcam.com/viewtopic.php?f=2&t=5743

Good luck,