HEIDENHAIN PT 855 for Milling User Manual

Page 31

I - 2 Working with POSITIP First Steps

POSITIP 855

Operating Instructions

Fig. 21: The graphic positioning aid

Displaying and moving to positions

Distance-To-Go feature

Although it is often sufficient to have POSITIP display the coordi-

nates of the actual position of the tool, it is usually better to use

the Distance-To-Go feature this enables you to approach nomi-

nal positions simply by traversing to display value zero.

Even when working with the Distance-To-Go feature you can enter

coordinates in absolute or incremental dimensions.

Graphic positioning aid

When you are traversing to display value zero, POSITIP displays a

graphic positioning aid (see figure 21).

POSITIP can also show the absolute position instead of

the graphic positioning aid. You can switch between

these two modes with operating parameter P 91 (see

chapter II - 2).

POSITIP displays the graphic positioning aid in a narrow rectangle

underneath the currently active axis. Two triangular marks in the

center of the rectangle symbolize the nominal position you want to

reach.

A small square symbolizes the axis slide. An arrow indicating the

direction appears in the square while the axis is moving. You can

thus easily tell whether you are moving towards or away from the

nominal position.

Note that the square does not begin to move until the axis slide is

near the nominal position.

Taking the tool radius into account

POSITIP has a tool radius compensation feature (see figure 22). This

allows you to enter workpiece dimensions directly from the draw-

ing. The displayed remaining distance is then automatically length-

ened (R+) or shortened (R) by the value of the tool radius.

Entering tool data

ä Press MOD.

ä Choose the soft key

Tool Table

ä Enter the tool diameter.

ä Enter the tool length.

ä Select the tool axis by soft key.

ä Press ENT.

ä Press MOD again.

R–

R+

Fig. 22: Tool radius compensation