HEIDENHAIN SW 54843x-03 DIN Programming - Manual (Page 570)

570 TURN PLUS
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Roughing limit in front of cutting limit
Example 1: The roughing limit (SU) is located in front of the cutting
limit, inside (SBI).
Abbreviations
 SBI: Cutting limit, inside
 SU: Roughing limitation (SU = sbl + ULI)
 sbl: Basic length of roughing cut ("deepest" point of inside contour)
 ULI: Overhang length, inside (machining parameter 4)
 nbl: Usable tool length (tool parameter)