HEIDENHAIN TNC 640 User Manual page 197

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Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling | FACE MILLING (Cycle 233, DIN/ISO: G233)

Strategy Q389=4

4 With the programmed Feed rate for milling the tool

subsequently approaches the starting point of the milling path

on a tangential arc.

5 The TNC machines the level surface at the feed rate for

milling from the outside toward the inside with ever-shorter

milling paths. The constant stepover results in the tool being

continuously engaged.

6 The process is repeated until the programmed surface has been

completed. At the end of the last path, the TNC positions the

tool at rapid traverse FMAX back to the starting point 1.

7 If more than one infeed is required, the TNC moves the tool in

the tool axis to the next plunging depth at the positioning feed

8 The process is repeated until all infeeds have been machined. In

the last infeed, only the finishing allowance entered is milled at

the finishing feed rate.

9 At the end of the cycle, the tool is retracted at FMAX to the 2nd

set-up clearance.

The limiters enable you to limit the machining of the level surface,

for example, to account for side walls or shoulders during

machining. A side wall that is defined by a limit is machined to the

finished dimension resulting from the starting point or the side

lengths of the level surface. For roughing the TNC includes the

oversize of the side - for finishing the oversize helps to preposition

HEIDENHAIN | User's manual for cycle programming | 10/2017