Rectangular Pocket (Cycle 251, Din/Iso: G251); Cycle Run - HEIDENHAIN TNC 640 User Manual

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Fixed Cycles: Pocket Milling / Stud Milling / Slot Milling | RECTANGULAR POCKET (Cycle 251, DIN/ISO:

RECTANGULAR POCKET (Cycle 251,

DIN/ISO: G251)

Use Cycle 251 RECTANGULAR POCKET to completely machine

rectangular pockets. 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

1 The tool plunges the workpiece at the pocket center and

advances to the first plunging depth. Specify the plunging

strategy with parameter Q366.

2 The TNC roughs out the pocket from the inside out, taking

the path overlap (parameter Q370) and the finishing allowance

(parameters Q368 and Q369) into account.

3 At the end of the roughing operation, the TNC moves the tool

tangentially away from the pocket wall, then moves by the set-

up clearance above the current pecking depth and returns from

there at rapid traverse to the pocket center.

4 This process is repeated until the programmed pocket depth is

5 If finishing allowances have been defined, the TNC plunges and

then approaches the contour. The approach movement occurs

on a radius in order to ensure that a gentle approach is possible.

The TNC first finishes the pocket walls, in multiple infeeds if so

6 Then the TNC finishes the floor of the pocket from the inside

out. The pocket floor is approached tangentially.

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