Circular Slot - HEIDENHAIN TNC 320 User Manual

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 (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.
5 Then the TNC finishes the floor of the slot from the inside out. The
slot floor is approached tangentially.
HEIDENHAIN TNC 320 143