HEIDENHAIN TNC 620 (81760x-02) Cycle programming - Manual (Page 144)

Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling
5.4 SLOT MILLING (Cycle 253, DIN/ISO: G253), Software Option 19
5
144
TNC 620 | User's Manual Cycle Programming | 2/2015
5.4 SLOT MILLING (Cycle 253, DIN/ISO:
G253), Software Option 19
Cycle run
Use Cycle 253 to completely machine a slot. Depending on the
cycle parameters, the following machining alternatives are available:
Complete machining: Roughing and finishing (floor and side
finishing)
Only roughing
Only finishing (floor and side finishing)
Only floor finishing
Only side finishing
Roughing
1 Starting from the left slot arc center, the tool moves in a
reciprocating motion at the plunging angle defined in the tool
table to the first infeed depth. Specify the plunging strategy
with parameter Q366.
2 The TNC roughs out the slot from the inside out, taking the
finishing allowances (parameters Q368 and Q369) into account.
3 This process is repeated until the programmed slot depth is
reached.
Finishing
4 Inasmuch as finishing allowances are defined, the TNC then
finishes the slot walls, in multiple infeeds if so specified. The
slot side is approached tangentially in the left slot arc.
5 Then the TNC finishes the floor of the slot from the inside out.