HEIDENHAIN SW 54843x-02 DIN Programming - Manual (Page 531)

HEIDENHAIN MANUALplus 620, CNC PILOT 640 531
7.
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Machining sequence—Fundamentals
TURN PLUS analyzes the contour in the sequence defined in
"Machining sequence." In this process the areas to be machined and
the tool parameters are ascertained. The AWG analyzes the contour
using the machining parameters.
TURN PLUS distinguishes between:
 Main machining operation (e.g. Undercutting)
 Submachining operation (e.g. type H, K, or U)
 Machining location (e.g. outside or inside)
"Submachining" and "machining location" refine the machining
specification. If you do not define the submachining operation or
machining location, the AWG generates machining blocks for all
submachining operations/machining locations.