Please Note While Programming - HEIDENHAIN TNC 640 User Manual

Fixed Cycles: Cylindrical Surface | CYLINDER SURFACE Slot milling (Cycle 28, DIN/ISO: G128, software
option 1)

Please note while programming:

This cycle performs an inclined 5-axis machining
operation. To run this cycle, the first machine axis below
the machine table must be a rotary axis. In addition, it
must be possible to position the tool perpendicular to
the cylinder surface.
Define the approaching behavior in ConfigDatum,
CfgGeoCycle, apprDepCylWall
CircleTangential:
Tangential approach and departure
LineNormal: The movement to the contour starting
point is not performed on a tangential path, but on a
straight line
In the first NC block of the contour program, always
program both cylinder surface coordinates.
The algebraic sign for the cycle parameter DEPTH
determines the working direction. If you program
DEPTH=0, the cycle will not be executed.
This cycle requires a center-cut end mill (ISO 1641).
The cylinder must be set up centered on the rotary
table. Set the preset to the center of the rotary table.
The spindle axis must be perpendicular to the rotary
table axis when the cycle is called.
This cycle can also be used in a tilted working plane.
The set-up clearance must be greater than the tool
radius.
The machining time can increase if the contour consists
of many non-tangential contour elements.
When you use local QL Q parameters in a contour
subprogram you must also assign or calculate these in
the contour subprogram.
HEIDENHAIN | User's manual for cycle programming | 10/2017
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