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26
Protecting the HS20 laser head
In most cases the laser head will have some form of primary protection, such as the machine way
covers. If this is not the case then it will be necessary to protect the laser head from physical impact
and contamination by using an enclosure that covers the laser and alignment plate assembly.
Additionally in cases of extreme conditions, where excessive coolant mist, graphite or composite
material dust are present, the way covers may not be sufficient to protect the laser head. In this
instance, additional protection should be considered.
Design of the measurement retroreflector mounting
The retroreflector is mounted on the moving element of the machine, this arm of the optical
configuration is often termed the measurement arm.
The bracket design must ensure that:
• If beam protection ducting is being used the retroreflector is positioned in the middle of the beam
protection ducting.
• The distance between the machine moving element and the measurement retroreflector is kept as
small as possible to minimise possible vibration effects. The bracket and mounting should be rigid
in the axis of movement, this is extremely important to avoid vibration being induced in the axis.
Figure 22 - typical retroreflector mounting
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