HEIDENHAIN TNC 640 (34059x-05) Cycle programming - Manual (Page 150)

Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling
5.4 SLOT MILLING (Cycle 253, DIN/ISO: G253)
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TNC 640 | User's Manual Cycle Programming | 1/2015
5.4 SLOT MILLING (Cycle 253, DIN/ISO:
G253)
Cycle run
Use Cycle 253 to completely machine a slot. Depending on the
cycle parameters, the following machining alternatives are available:
Complete machining: Roughing, floor finishing, side finishing
Only roughing
Only floor finishing 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 und Q369) into account.
3 The TNC retracts the tool by the set-up clearance Q200. If the
slot width matches the cutter diameter, the TNC retracts the
tool from the slot after each infeed.
4 This process is repeated until the programmed slot depth is
reached.
Finishing
5 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.
6 Then the TNC finishes the floor of the slot from the inside out.