Heidenhain iTNC 530 (340 420) User Manual download pdf (Page 349)

HEIDENHAIN iTNC 530 321

8.7 SL Cycles with Contour Formula

Fundamentals

SL cycles and the contour formula enable you to form complex

contours by combining subcontours (pockets or islands). You define

the individual subcontours (geometry data) as separate programs. In

this way, any subcontour can be used any number of times. The TNC

calculates the complete contour from the selected subcontours,

which you link together through a contour formula.

Properties of the subcontours

n By default, the TNC assumes that the contour is a pocket. Do not

program a radius compensation. In the contour formula you can

convert a pocket to an island by making it negative.

n The TNC ignores feed rates F and miscellaneous functions M.

n Coordinate transformations are allowed. If they are programmed

within the subcontour they are also effective in the following

subprograms, but they need not be reset after the cycle call.

n Although the subprograms can contain coordinates in the spindle

axis, such coordinates are ignored.

n The working plane is defined in the first coordinate block of the

subprogram. The secondary axes U,V,W are permitted.

Characteristics of the fixed cycles

n The TNC automatically positions the tool to set-up clearance before

a cycle.

n Each level of infeed depth is milled without interruptions since the

cutter traverses around islands instead of over them.

n The radius of “inside corners” can be programmed—the tool keeps

moving to prevent surface blemishes at inside corners (this applies

for the outermost pass in the Rough-out and Side-Finishing cycles).

n The contour is approached in a tangential arc for side finishing.

Example: Program structure: Machining with SL

cycles and contour formula

0 BEGIN PGM CONTOUR MM

...

5 SEL CONTOUR “MODEL“

6 CYCL DEF 20.0 CONTOUR DATA ...

8 CYCL DEF 22.0 ROUGH-OUT...

9 CYCL CALL

...

12 CYCL DEF 23.0 FLOOR FINISHING ...

13 CYCL CALL

...

16 CYCL DEF 24.0 SIDE FINISHING ...

17 CYCL CALL

63 L Z+250 R0 FMAX M2

64 END PGM CONTOUR MM

Example: Program structure: Calculation of the

subcontours with contour formula

0 BEGIN PGM MODEL MM

1 DECLARE CONTOUR QC1 = “CIRCLE1“

2 DECLARE CONTOUR QC2 = “CIRCLE31XY“

3 DECLARE CONTOUR QC1 = “TRIANGLE“

4 DECLARE CONTOUR QC1 = “SQUARE“

5 QC10 = ( QC1 | QC3 | QC4 ) \ QC2

6 END PGM MODEL MM

0 BEGIN PGM CIRCLE1 MM

1 CC X+75 Y+50

2 LP PR+45 PA+0 R0

3 CP IPA+360 DR+

4 END PGM CIRCLE1 MM

0 BEGIN PGM CIRCLE31XY MM

...

The memory capacity for programming an SL cycle (all

contour description programs) is limited to 32 contours.

The number of possible contour elements depends on the

type of contour (inside or outside contour) and the number

of contour descriptions. For example, you can program up

to approx. 1024 line blocks.

The SL cycles with contour formula presuppose a

structured program layout and enable you to save

frequently used contours in individual programs. Using the

contour formula, you can connect the subcontours to a

complete contour and define whether it applies to a

pocket or island.

In its present form, the "SL cycles with contour formula"

function requires input from several areas in the TNC's

user interface. This form is to serve as a basis for further

development.

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Heidenhain iTNC 530 (340 420) User Manual Page 349

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