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2. Mounting on a concrete plinth off the machine (as shown below). Although concrete has a
coefficient of expansion that is similar to steel, the structure's thermal mass will provide a far
greater degree of laser alignment stability than a support fabricated from steel. Again the HS20
laser beam will run parallel to the axis travel.
When designing the mounting scheme for the HS20 laser system the main criteria should be rigidity
and stability of both the laser and the linear optics. It is important that the mounting scheme ensures
the laser beam alignment remains stable to within ±0.5 mm at the far end of the axis. This is easy
to achieve on short axis machine axes, but on very long machine axes, the stability of the mounting
scheme becomes crucial. Under these conditions it is strongly recommended that the Renishaw
alignment plate is used since it has been designed to accommodate the small expansion of the HS20
laser during preheat without disturbing beam alignment.
Figure 6 - Plinth mounting arrangement
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