HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 556)

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ining Inf
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Roughing limit behind cutting limit
Example 2: The roughing limit (SU) is located behind 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)
Drilling
TURN PLUS distinguishes the following drilling operations:
„ Drilling without fit specifications: The AWG selects tools that
permit machining to finished dimensions. First it searches for twist
drills, then for boring bars with indexable inserts.
„ Drilling with fit specifications: The AWG drills the hole in two
steps:
„ Drilling with smaller diameter than the nominal diameter of the
hole.
„ “Reaming” to finished dimension
TURN PLUS only evaluates the information “with/without
fit.” The type of fit (H6, H7, ..) has no effect.