Cylinder Surface Slot Milling (Cycle 28, Din/Iso: G128, Software Option 1); Cycle Run - HEIDENHAIN TNC 640 User Manual

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

Cycle run

With this cycle you can program a guide notch in two dimensions
and then transfer it onto a cylindrical surface. Unlike Cycle 27 ,
with this cycle the TNC adjusts the tool so that, with radius
compensation active, the walls of the slot are nearly parallel. You
can machine exactly parallel walls by using a tool that is exactly as
wide as the slot.
The smaller the tool is with respect to the slot width, the larger the
distortion in circular arcs and oblique line segments. To minimize
this process-related distortion, you can define the parameter
Q21. This parameter specifies the tolerance with which the TNC
machines a slot as similar as possible to a slot machined with a tool
of the same width as the slot.
Program the midpoint path of the contour together with the tool
radius compensation. With the radius compensation you specify
whether the TNC cuts the slot with climb milling or up-cut milling.
1 The TNC positions the tool over the cutter infeed point.
2 The TNC moves the tool to the first plunging depth. The
tool approaches the workpiece on a tangential path or on a
straight line at the milling feed rate Q12. The approaching
behavior depends on the parameter ConfigDatum CfgGeoCycle
apprDepCylWall.
3 At the first plunging depth, the tool mills along the programmed
slot wall at the milling feed rate Q12 while respecting the
finishing allowance for the side.
4 At the end of the contour, the TNC moves the tool to the
opposite wall and returns to the infeed point.
5 Steps 2 to 3 are repeated until the programmed milling depth
Q1 is reached.
6 If you have defined the tolerance in Q21, the TNC then
remachines the slot walls to be as parallel as possible.
7 Finally, the tool retracts in the tool axis to the clearance height.
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Y (Z)
HEIDENHAIN | User's manual for cycle programming | 10/2017
option 1)
X (C)