Modern Machine Shop, July 1st, 2000
Machining centers traditionally have three linear axes--X, Y and Z. If the machine is equipped with additional axes, they are usually rotary axes (A, B and/or C). An additional linear axis that provides some very unique application possibilities is commonly called the U axis. The U axis allows a cutting tool (commonly a boring-bar-type tool) to move in a direction perpendicular to the spindle centerline. This allows the diameter being machined by the tool to change during operation.
While the drawing in Figure 1 is a rather crude depiction of a U axis tool, the inner workings of this tool a...
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