Siemens Sinumerik 810T Manual de usuario descargar pdf (Pagina 39)

EMCO WINNC SINUMERIK 810/820 T

D 7

PROGRAMMING

G33 Thread Cutting

Format

N... G33 X... Z... I/K...

I/K........Thread pitch [mm]

I ...........in X direction (longitudinal)

K ..........in Z direction (face)

Straight, tapered and scroll threads can be cut.

For thread pitch I or K has to be entered according to

the main direction of the thread (longitudinal or face).

Machining routines like knurling are also possible.

Note

• Feed and spindle override are not active with G33

(100%).

• A fair sized undercut has to be machined first.

Measures for thread cutting

Cutting movements parallel to the axes and slant

Tip radius and theoretical cutter tip

Cutter Radius Compensation

During tool measurement the tool tip is merely meas-

ured at two points (touching the X and Z axes).

The tool offset therefore only describes a theoretical

cutter tip.

This point is traversed on the workpiece in the pro-

grammed path.

With movements in the axis directions (longitudinal

and face turning) the points on the tool tip touching

the axes are used.

No dimensional errors are produced on the work-

piece.

With simultaneous movements in both axis direc-

tions (tapers, radii) the position of the theoretical

cutting point no longer coincides with the point on the

tip actually cutting. Dimensional errors occur on the

workpiece.

Maximum contour error without cutter radius com-

pensation with 45° movements:

Cutter radius 0,4 mm

0,16 mm path distance

0,24 mm distance in X and Z.

If cutter radius compensation is used, these dimen-

sional errors are automatically calculated and com-

pensated by the control.

X/2

1 2 ... 34 35 36 37 38 39 40 41 42 43 44 ... 89 90

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Siemens Sinumerik 810T Manual de usuario Pagina 39

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