Circular Slot (Cycle 254, Din/Iso: G254); Cycle Run - HEIDENHAIN TNC 640 User Manual

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Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling | CIRCULAR SLOT (Cycle 254, DIN/ISO: G254)

CIRCULAR SLOT (Cycle 254, DIN/ISO:

Use Cycle 254 to completely machine a circular slot. Depending

on the cycle parameters, the following machining alternatives are

Complete machining: Roughing, floor finishing, side finishing

Only roughing

Only floor finishing and side finishing

Only floor finishing

Only side finishing

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

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.

HEIDENHAIN | User's manual for cycle programming | 10/2017