The maker produced a rectangular metal component using CNC machining, which contrasts with typical methods. Instead of relying on pre-set templates, the maker utilized their own CNC programming for this project. The resulting piece, made of aluminum, served as the subject for the NIMS practical test. It is evident that the maker successfully completed their first hand coded and unsupervised part, an impressive feat.
Construction of the component involved several distinct features. The front face of the part showcases multiple milled features, including a central oblong slot pocket. Along one top edge, a circular scallop cutout is integrated. A raised plateau on the structure is finished with chamfered corners. Furthermore, the flat rear surface holds two counterbored holes, and handwritten black marker text appears there reading 'Pass fit'.
The machining process involved two separate passes. The rough pass employed a d geometry of .790, while the finish pass utilized a d geometry of .750. The maker also specified diameter and height wear to be .006 to allow for final adjustments. Using two passes with a .750 end mill is a specific technique that seems appropriate for the complexity of the milled areas.
One aspect that remains an open question is how the maker managed the precise dimensions of the various through-holes of varying diameters, given the specified wear parameters.