When a surface table is not levelled and set up correctly on the 3 primary levelling points the flatness can be potentially affected and therefore void the calibration certificate. This is because the load bearing points may not be in the same position and can potentially bend and twist the working surface.

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This issue of the working surface becoming altered is even more apparent when the surface table does not have 3 primary points for levelling. When the surface table has 4 corner supports moving the surface tale can cause the surface to be drastically affected. This is also the case when there are centre supports present, these are intended as secondary supports to additionally bear the weight of the surface table however, when the surface table is moved more pressure is sometimes applied to these points which can cause the surface to be more convex than previously.

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Some large surface tables are created by placing smaller surface tables together, when this is done a "step" or variance between the surfaces can be created which will directly affect any measurements that are taken over the joining area. When the surface tables are levelled together correctly there should be no noticeable variation between the working surfaces and should be able to be used over the full working surface area.

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It is also important to note that the surface table not being level can potentially make taking other measurements very difficult if not unreliable such as the use of levels and inclonometers. 

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From these points it is clear to see the impact of a surface table that is not level. If you have any surface tables that require levelling contact us today for further information.

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