Siemens SINUMERIK 828D Programming Manual page 590

Glossary
Limit speed
Maximum/minimum (spindle) speed: The maximum speed of a spindle can be limited by
specifying machine data, the → PLC or → setting data.
Linear axis
In contrast to a rotary axis, a linear axis describes a straight line.
Linear interpolation
The tool travels along a straight line to the destination point while machining the workpiece.
Load memory
The load memory is the same as → RAM for the CPU 314 of the → PLC.
Look Ahead
The Look Ahead function is used to achieve an optimal machining speed by looking ahead
over an assignable number of traversing blocks.
Machine axes
Physically existent axes on the machine tool.
Machine control panel
An operator panel on a machine tool with operating elements such as keys, rotary switches,
etc., and simple indicators such as LEDs. It is used to directly influence the machine tool via
the PLC.
Machine coordinate system
A coordinate system, which is related to the axes of the machine tool.
Machine zero
Fixed point of the machine tool to which all (derived) measuring systems can be traced back.
Machining channel
A channel structure can be used to shorten idle times by means of parallel motion
sequences, e.g. moving a loading gantry simultaneously with machining. Here, a CNC
channel must be regarded as a separate CNC control system with decoding, block
preparation and interpolation.
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Programming Manual, 07/2010, 6FC5398-1BP40-0BA0
Fundamentals