Introduction and fundamentals | Fundamentals
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HEIDENHAIN | MANUALplus 620 | User's Manual | 12/2017
55
Workpiece datum
To machine a workpiece, it is easier to enter all input data with
respect to a zero point located on the workpiece. By programming
the zero point used in the workpiece drawing, you can take the
dimensions directly from the drawing, without further calculation
(dimensioning origin). This point is the workpiece datum. The
workpiece datum is designated with the letter W.
Units of measure
You can program the control either in the metric or inch system.
The units of measurement listed in the table below apply to all
inputs and displays.
Dimensions Metric Inches
Coordinates mm inch
Lengths mm inch
Angle Degrees Degrees
Spindle speed rpm rpm
Cutting speed m/min ft/min
Feed per revolution mm/rev inch/rev
Feed per minute mm/min inch/min
Acceleration m/s
2
ft/s
2
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