HEIDENHAIN CNC Pilot 4290 - Manual (Page 338)

6 TURN PLUS 326
6.16.4 Hollowing
If hollowing precedes recess-turning or contour-recessing in the
machining sequence, recess areas (undefined recesses) are
machined with roughing tools. Otherwise, the AWG machines the
respective contour areas using recessing tools. TURN PLUS uses the
”Inward copying angle EKW” (machining parameter 1) to distinguish
recesses from relief turns.
If more than one tool is required for the hollowing operation, TURN
PLUS pre-machines the area with the first tool and removes the
residual material with a tool machining in the opposite direction.
Contour machining (finishing): The AWG finish-machines hollowed
recesses using the same strategy as for the roughing operation.
Depending on the contour and the available tools, the machining
operation is executed as follows:
■ Complete hollowing with one tool. If more than one tool is available,
the tool with standard machining direction is used.
■ If the final contour element of the area to be hollowed is a
transverse element, the tool first cuts towards the transverse
element (see figure).
■ If the two tools have different clearance angles, the tool with the
larger clearance angle is used first.
■ If both tools have the same clearance angle, machining starts from
the side with the smallest ”inward copying angle.”
Danger of collision!
During hollowing operations on the inside of contours, the
plunging depth of the tool is not checked. Select suitable
tools.
6.16 Mac
hining Inf
or
mation
6.16.5 Inside Contours
TURN PLUS machines continuous inside contours up to the transition
from the ”deepest point” to a greater diameter. In addition, TURN
PLUS accounts for
■ Cutting limitation, inside
■ Overhang length, inside (ULI, machining parameter 4)
when determining the end position for drilling, roughing and finishing
operations. TURN PLUS assumes that the usable tool length is
sufficient for the respective machining operation; if not, the inside
contour is machined according to the tool parameter.