HEIDENHAIN TNC 320 - CIRCULAR SLOT (Cycle 254, DIN;ISO: G254); Cycle Run

Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling
5.5 CIRCULAR SLOT (Cycle 254, DIN/ISO: G254)
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HEIDENHAIN | TNC 320 | User’s manual for cycle programming | 9/2016
5.5 CIRCULAR SLOT (Cycle 254, DIN/ISO:
G254)
Cycle run
Use Cycle 254 to completely machine a circular 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 The tool moves in a reciprocating motion in the slot center 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 (parameter Q368) 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.
6 Then the TNC finishes the floor of the slot from the inside out.