Scanlab RTC 5 PC Interface Board - “Freely Definable Wobbel Shapes”

RTC
®
5 PC Interface Board
Rev. 1.9 e
8 Advanced Functions for Scan Head and Laser Control
169
innovators for industry
Wobbel Parameters
• The maximum frequency estimated with
rule of thumb (1):
F = 1/(10
 0.3310
3
[s])  300 Hz.
• Wobbel amplitude estimated with
rule of thumb (2):
A = 0.33
10
3
[s]  1.4410
8
[bit/s]
 47,500 [bit].
– In the image field this corresponds to a wobbel
amplitude of A/K  9,5 [mm].
• Path velocity of circular wobbel shapes
as given by rule of thumb (3) is:
V
Path
895 [bit/10 µs].
•The maximum marking speed results from
V
Path
/K (in this example 89,500,000 [bit/s] /
5,000,000 [bit/m]
 17.9 [m/s]. Note that this
value is a rough estimate. Furthermore, it is
dependent on a position due to the correction file
(which is non-linear).
The calculated path velocity for wobbel only (!)
– shall be lower than the specified maximum
positioning speed,
– but there may be certain circumstances where
it is much higher than the typical marking
speed.
Make sure that your values are suitable for oper-
ation (temperature status and so on, same as
above).
“Freely Definable Wobbel Shapes”
When defining “freely definable wobbel shapes”
(set_wobbel_vector command) take the dynamics
of the scan head into account. As with “classic”
wobbel shapes (see above) the maximum positioning
speed may not exceeded significantly. That is, every
individual microvector of the “freely definable
wobbel shape“ may not significantly exceed a
duration of 10 µs times maximum positioning speed.
Otherwise, a galvanometer overheating may occur.