A feature on the interior of a part that will not allow a mold that contains it to slide away along the parting direction. An internal undercut can be either a protrusion or a depression (hole or pocket) and requires an additional mold piece to form its shape. Most internal undercuts require an ...
A device that stores several tools, each in its own pocket or tool holder, and can automatically move the required tool into position. In a milling machine, this device removes the tool from the spindle, places it back in the correct pocket, and inserts a new tool into the spindle. In a turning ...
A piece of material that is secured in a fixture and machined into the final part. The workpiece is often cut from a larger piece of stock material and can be a sheet (blank), a standard extruded shape (solid bar, hollow tube, or shaped beam), a custom extrusion, or any prefabricated part such as a ...
The number of cycles performed during the casting process before the wear on the die is too much for it to be used anymore. If the die life is shorter than the number of cycles needed to produce the production quantity of parts, additional dies will be needed. However, a die can be repaired to ...
The distance that the cutting tool or workpiece advances during one revolution of the spindle, measured in inches per revolution (IPR). In some operations the tool feeds into the workpiece and in others the workpiece feeds into the tool. For a multi-point tool, the cutting feed is also equal to the ...
Acetal resins, whose chemical name is polyoxymethylene, are formed from the polymerization of formaldehyde. Acetals tend to have a high degree of crystallinity, giving them superior strength and stiffness compared with other thermoplastics, while retaining good toughness at low temperatures. ...
A chamber which is attached to the mold cavity that fills with molten metal during injection. The first material to enter the mold is allowed to pass completely through and enter the overflow wells. This strategy prevents early solidification of the molten metal and provides a source of material to ...
A man-made solid produced by the fusion of inorganic substances. A more specific definition within the slip casting industry is that the term 'ceramics' has come to signify the use of talc-ball clay slurries to cast ware for firing at low temperatures, where as the term 'pottery' is used to refer ...
