HEIDENHAIN PT 855 for Milling User Manual

Page 22

I - 2 Working with POSITIP First Steps

Operating Instructions

POSITIP 855

Datum setting: Approaching positions and entering actual values

The easiest way to set datum points is to use the POSITIP's prob-

ing functions regardless of whether you probe the workpiece with

the HEIDENHAIN KT Edge Finder or with a tool. A description of the

probing functions starts on page 22.
Of course, you can also set datum points in the conventional man-

ner by touching the edges of the workpiece one after the other with

the tool and entering the tool positions as datum points (see exam-

ples on this page and the next).

The datum table can hold up to 99 datum points. In most cases this

will free you from having to calculate the axis travel when working

with complicated workpiece drawings containing several datums.
For each datum point, the datum table contains the positions that

the POSITIP assigned to the reference points on the scales (REF

values) during datum setting. Note that if you change the REF val-

ues in the table, this will move the datum point.

Example: Setting a workpiece datum without the probing function

Working plane:

X / Y

Tool axis:

Tool radius:

R = 5 mm

Axis sequence in

this example:

X - Y - Z

Preparation: Select the datum

Select the datum with the vertical arrow keys.

POSITIP displays the number of the current datum at the lower right

of the screen.

Preparation: Call the tool data

Call the tool data for the tool which you are using to touch the work-

piece (see previous page).