Diamond Drag Engraving is the most common form of computer controlled engraving, where a diamond tipped tool is used to scratch almost any surface with text and images.
Cylindrical items and most curved surfaces can be engraved using this method, however for non-cylindrical curved surfaces the engraving area can become restricted (over the area to be engraved the "height" of the item cannot vary by more than 25mm, and surface angle must be no greater than 30º).
More examples
Rotary engraving uses a tool to mill away material, creating a deeper cut. The depth of this cut can be accurately controlled, and multiple levels of engraving depth are possible.
Rotary engraving can also be used on cylindrical items, such as trophy cups which will be gold plated, where diamond drag engraving does not provide a sufficiently deep cut to show through the extra plating.
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