| UNDERCUT | A type of recessed surface inside diameter of a part that is inaccessible using a straight tool. In milling, when a cutter has to reach under a shelf, undercut refers to a surface that is not visible when the part is viewed from the spindle.
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| UNIVERSAL GRINDER | A versatile grinding machine
designed to perform both internal and external
grinding operations, including straight and tapered
surfaces on tools and cutters
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| UNIVERSAL MILLING MACHINE | A milling machine with
a worktable that can be swiveled for milling helical
work. It is always supplied with attachments,
including an indexing fixture.
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| UNIVERSAL VISE | A vise designed for holding work at a
double or compound angle. Also, a toolmaker’s vise.
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| USER-DEFINED VARIABLE | Users can define variables in the part program or the data block for their own use (global user data). A definition contains a data type specification and the variable name.
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