Long, rigid structures that are attached at one or both ends to a surface to provide support. These include arms, axles, bars, columns, cylinders, pillars, poles, posts, rails, rods, shafts, spokes, structures, struts, supports, trusses, etc.
The distance between two identical features, measured from the end of one feature to the start of the next. If multiple identical features exist at varied spacing, then the average distance between two neighboring features should be used.
The rotational speed of the spindle in revolutions per minute (RPM). In a milling machine, the spindle speed describes the rotation of the attached cutting tool. In a turning machine, it describes the rotation of the attached workpiece.
Sometimes referred to as the processing temperature or melt temperature, this property describes the temperature at which molten material is injected into the mold. The injection temperature is determined by the material being injected.
ASA is produced either by a patented, proprietary process or by graft process. ASA has superior weatherability compared with ABS and because of an absence of double bonds resists yellowing and embrittlement better than other polymers.
A chamber attached to the runner system that fills with molten metal during injection to provide an additional source of material during cooling. When the part cools, the molten material will shrink and additional material is needed.
A groove on the side of a cutting tool, such as an end mill or drill bit, that is between the cutting teeth. These grooves may be vertical, but typically form a helix to allow the material chips to be pulled away from the workpiece.
A pocket in a part which has inward curving surfaces, but are not completely enclosed. A solid object that fills such a cavity could not be removed. Many manufacturing processes are incapable of producing parts with such a feature.
