HEIDENHAIN TNC 620 (81760x-02) Cycle programming - Manual (Page 206)

Fixed Cycles: Contour Pocket
7.11 TROCHOIDAL SLOT (Cycle 275, DIN ISO G275, software option 19)
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TNC 620 | User's Manual Cycle Programming | 2/2015
7.11 TROCHOIDAL SLOT (Cycle 275, DIN
ISO G275, software option 19)
Cycle run
In conjunction with Cycle 14 CONTOUR GEOMETRY, this cycle
facilitates the complete machining of open and closed slots or
contour slots using trochoidal milling.
With trochoidal milling, large cutting depths and high cutting speeds
are possible because the equally distributed cutting conditions
prevent wear-increasing influences on the tool. When tool inserts are
used the entire cutting length is exploited to increase the attainable
chip volume per tooth. Moreover, trochoidal milling is easy on the
machine mechanics.
Depending on the cycle parameters you select, the following
machining alternatives are available:
Complete machining: Roughing, side finishing
Only roughing
Only side finishing
Roughing with closed slots
The contour description of a closed slot must always start with a
straight-line block (
L block).
1 Following the positioning logic, the tool moves to the starting
point of the contour description and moves in a reciprocating
motion at the plunging angle defined in the tool table to the first
plunging depth. Specify the plunging strategy with parameter
Q366.
2 The TNC roughs the slot in circular motions to the contour end
point. During the circular motion the TNC moves the tool in
machining direction by an infeed you can define (
Q436). Define
climb or up-cut of the circular motion in parameter
Q351.
3 At the contour end point, the TNC moves the tool to clearance
height and returns to the starting point of the contour description.
4 This process is repeated until the programmed slot depth is
reached.
Finishing with closed slots
5 Inasmuch as a finishing allowance is defined, the TNC finishes
the slot walls, in multiple infeeds if so specified. Starting from
the defined starting point, the TNC approaches the slot wall
tangentially. Climb or up-cut are taken into consideration.
Program structure: Machining with
SL cycles
0 BEGIN PGM CYC275 MM
...
12 CYCL DEF 14.0 CONTOUR
13 CYCL DEF 14.1 CONTOUR LABEL 10
14 CYCL DEF 275 TROCHOIDAL SLOT...
15 CYCL CALL M3
...
50 L Z+250 R0 FMAX M2
51 LBL 10
...
55 LBL 0
...
99 END PGM CYC275 MM