Zeiss METROTOM 1500 G3, Руководство по эксплуатации, Страница: 76 / 120

Setting up the workpiece and measurement
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61211-8140502 METROTOM 1500 G3 1.4
The workpiece describes a circumscribed cylinder while rotating by 360°
during the measurement. The size of the circumscribed cylinder needs to
be considered when setting up the workpiece.
Damage to X-ray components as a result of collision with large
workpieces.
Damage to the X-ray tube or X-ray detector during a 360° rotation of
large workpieces.
—
When setting up large workpieces, check whether the workpiece
can be rotated by 360° without collision.
—
Ensure that the machine moves at very low speed.
—
In case of large workpieces, do not move to the loading position.
The workpiece may collide with the wall of the X-ray chamber, caus-
ing the workpiece to move on the rotary table and to fall from the
rotary table. If the workpiece falls on the X guide, this may result in
severe damage to the X guides.
Fastening
NOTE
Workpieces must be clamped, i. e., ensure that they do not bounce and
change their position. No magnetic materials may be used for clamping.
Magnets have an effect on the electron optics in the X-ray tube. The
magnets in the workpiece pallet are shielded and do not exert an effect.
Holding block
It must be possible to move the workpiece close to the X-ray tube to en-
sure that even small parts can be imaged on the detector with maximum
magnification. Therefore: the smaller the workpiece, the smaller the
holding block. If the holding block is too large, collision with the X-ray
tube may be caused.
In the case of similar parts (serial parts) to be measured frequently, it is
recommended to create special holding blocks, e. g. a polystyrene hold-
ing block in which the contour of the workpiece to be measured has
been milled or burned out. Benefits:
– Increased repeatability of measurements.
– The settings of previous measurements can be loaded.
The burning out of a polystyrene block leads to a compression of the
material which may have a negative effect on the measurement. This is
the case, for example, if compressed polystyrene in the vicinity of a sur-
face to be measured appears to indicate a wrong surface. Cutting out
the polystyrene is therefore preferable in most cases.