HEIDENHAIN TNC 640 (34059x-01) Cycle programming - Manual (Page 517)

HEIDENHAIN TNC 640 517
1
9
.4 MEA
S
URE KINEMA
TICS (Cy
c
le
451, DIN/ISO: G451; Option)
Choice of number of measuring points
To save time you can make a rough optimization with a small number
of measuring points (1 or 2), for example during commissioning.
You then make a fine optimization with a medium number of
measuring points (recommended value = approx. 4). Higher numbers
of measuring points do not usually improve the results. Ideally, you
should distribute the measuring points evenly over the tilting range of
the axis.
This is why you should measure an axis with a tilting range of 0° to
360° at three measuring points, namely at 90°, 180° and 270°. Thus,
define a starting angle of 90° and an end angle of 270°.
If you want to check the accuracy accordingly, you can also enter a
higher number of measuring points in the Check mode.
Choice of the calibration sphere position on the
machine table
In principle, you can fix the calibration sphere to any accessible
position on the machine table and also on fixtures or workpieces. The
following factors should positively influence the result of
measurement:
„ On machines with rotary tables/tilting tables:
Clamp the calibration sphere as far as possible away from the center
of rotation.
„ Machines with large traverse:
Clamp the calibration sphere as closely as possible to the position
intended for subsequent machining.
If a measuring point has been defined at 0°, it will be
ignored because the reference measurement is always
done at 0°.