Laminar flow restrictors that provide optimum damping of an all amplitudes can be implemented with shim stock and spacers with no impact on the machine installation. Conventional solutions to this instability problem include lowering the sensitivity of the self leveling valves, increasing the spacing between the isolators and lowering the center of mass of the machine with respect to the isolators. This non-linearity Insures that the damping is correct at only one amplitude of oscillation which can in turn lead to limit cycles as large as 1 mm. a restrictor, but flow through an orifice is non-linear with pressure. Commercially available isolators use a simple orifice as. Air flow from the isolator to a tank can dissipate the oscillatory energy if it is passed through a restrictor. Damping of the machine mass/air spring behavior becomes essential when automatic height adjustment is added. Pneumatic isolators provide excellent isolation of machine tools and measuring machines from seismic floor disturbances.
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