Believed to be for the first time, air bearing technology has been applied on a standard industrial gantry system to minimisation of vibration when the gantry was moving.
Anorad Europe has, for the first time, been able to apply air bearing technology on a standard industrial gantry system. While air bearings are a mature technology used on ultra high precision single and 2-axis positioning systems, they have so far been too expensive to be deployed in the general manufacturing environment. A specific application recently required a customised system to be designed, engineered and assembled by Anorad Europe, in Holland.
Crucial to the user was the minimisation of vibration when the gantry was moving.
Both the lower axis and the bridge axis of the resultant gantry are equipped with Anorad's epoxy cored , zero cogging, linear motors in combination with the air bearings.
Position measurement is via a 20 micron pitch linear encoder scale, while the controller's software interpolates the measurements to give a 10nm resolution.
Travel is 600mm x 600mm x 150mm and repeatability is an impressive 0.5 micron per axis at the point of interest.
Accuracy achieved is an equally remarkable 4.5 micron per axis.
Anorad has constructed air bearing systems up to 5m travel in previous projects.
Additionally, the machine features a Z-axis for focusing.
This fourth axis is also driven by an epoxy core linear motor and has cross roller bearings and pneumatic counterbalance mechanism.
The motion control panel is based on Anorad's 4-axis SpiiPlus-PCI controller coupled with linear amplifiers in a custom 19-inch rack, also manufactured at Anorad.
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