Milling (3D cut)
A spindle mounted in a 5+ axis device such as a CNC or robotic arm can have its mill describe an infinite number of ruled surfaces in space. This allows for the cutting of a variety of materials ranging from soft foams to hard stones. The length of the mill (seldom over 150mm) allows for an expression of volume compatible with stereotomic construction. Specially crafted mills can produce useful results, as is the case in the Armadillo Vault (Matthias Rippmann et al., 2016), in which two different mills (one with a groove and another with a ridge) create registration notches (Figure 56) that allow for a W coordinate information in the voussoir placement.
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