The CNC router is not only a powerful tool for building, but also a great way to prototype. As shown in the example below, techniques such as engraving and roughing have been employed to create a sample plaque.
In this particular design, a botanical sketch of a fern is shown highlighted on a silhouette of The Carrie Furnace – a former steel mill in Pittsburgh.
In order to capture smaller details, a 30 degree V bit was used at less than 1/10″ depth. Also, a 1/4″ milling bit was used to rough out the larger areas surrounding the building’s outline.
Plaques like these can later go on to be cast in other materials such as aluminum or iron.