Slot Milling - HEIDENHAIN TNC 320 User Manual

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 and Q369) into account.
3 This process is repeated until the 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 right slot arc.
5 Then the TNC finishes the floor of the slot from the inside out. The
slot floor is approached tangentially.
138 Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling