Scanlab RTC6 PCIe Board - Not yet Implemented; Processing-On-The-Fly Correction for the Z Axis

RTC6 boards
Doc. Rev. 1.0.21 en-US
8 Advanced Functions for Scan Head Control and Laser Control
257
innovators for industry
8.6.10 Tracking Error Compensation
of Encoder Values for
Processing-on-the-fly
Applications
– NOT YET IMPLEMENTED
Not yet implemented.
8.6.11 Processing-on-the-fly
Correction for the z Axis
The encoder-based Processing-on-the-fly correction
for the z axis (referred to as “FlyZ correction” in the
following) can be activated by set_fly_z.
You can add FlyZ to Processing-on-the-fly correction
for the x axis and y axis that had been activated by
set_fly_x/set_fly_y/set_fly_rot or can be effective on
its own.
This makes dynamic marking possible if the
workpiece plane (z = 0) and the scan system do not
move parallel to each other.
With “FlyZ correction” activated, the z component
workpiece motion gets compensated by re-
adjustment of the z axis (see Dynamic Focusing Unit)
in accordance with the current encoder signals.
Prerequisites
• Both, Option Processing-on-the-fly as well as the
Option “3D” must be enabled.
• The desired marking must function properly
when static (that is, without workpiece motion):
– The user program must model workpiece skew
by using suitable 3D vector commands.
– The varioSCAN must be capable of tracking the
xy galvanometer scanner motions of the
scan system.
• For moving workpieces, the Dynamic Focusing
Unit must also be capable of following workpiece
motion. Take care to exceed neither the maximum
focus range in z direction nor the depth of field of
the objective. Ensure that the precision of the
correction table is sufficient in terms of edge
sharpness, stretching etc. When used with
set_fly_rot, ensure that the rotation angle across
the Image Field is small enough and the rotation
center is sufficiently far away. Users are
responsible for appropriate testing. SCANLAB
provides no additional functionality for this. A
virtual Image Field for the z coordinate does not
exist.
• See also the operational prerequisites for 3-axis
scan systems in Section ”Connection and
Initialization”, page 237.