Inside Contours - HEIDENHAIN CNC PILOT 640 User Manual

TURN PLUS | Machining information

Inside contours

TURN PLUS machines continuous inside contours up to the
transition from the deepest point to a greater diameter.
The end position for drilling, roughing and finishing operations
depends on:
Cutting limit, inside
Overhang length, inside ULI (Processing machining parameter)
Prerequisite: The usable tool length must be sufficient for the
machining operation. If it is not, then this parameter defines the
inside machining operation. The following examples explain the
principle.
Limits for internal machining operations:
Predrilling: SBI limits the drilling operation
Roughing: SBI or SU limit the roughing operation
SU = basic length of roughing cut (sbl) + overhang length,
inside (ULI)
To avoid residual rings
TURN PLUS leaves an area of 5° in front of the roughing limit
Finishing: sbl limits the finishing operation
Roughing limit in front of cutting limit
Example 1: The roughing limit (SU) is located
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)
HEIDENHAIN | User's Manual smart.Turn and DIN Programming | 12/2017
during the machining process,
in front of the cutting
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