Newbie here, came across CNC Machines by accident on Ebay, while looking for an engraving machine.

I need a machine that can engrave (with precision) material up to 8" x 8" and have a variable dept (z) of up to 3", and be computer controlled, using Mach 2/3 etc.

Is there a manufacturer of such a device? I currently have an old Roland Engraver, but it only has a 5MM z axis.

My primary use is engraving silver (actually diamon drag), but I am interested in being able to do 3d engraving as well, on objects as small as 1.5", so I need tight tolerances.

I've searched through the forums and found some folks tha thave engraved with their mills, etc...

Any advice on where to begin?

Thanks.