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General tests for machine tools -- Method of testing performance of machines operating under loaded conditions in respect of thermal distortion
This Part of BS 3800 gives methods for assessing the contribution to workpiece inaccuracy arising from the thermal behaviour of the machine, due to internal heat sources, in respect of:
The tests for thermal distortion of the structure are applicable to any machine which incorporates a rotating spindle or spindles supporting the tool or the workpiece. The tests are designed to establish the relative displacements occurring between the tool and workpiece sides of the structure as a result of thermal expansion or contraction of key structural elements.
The tests for thermal drift of the axis drives are applicable to numerically controlled (NC) machines only and are designed to quantify the effects on positioning accuracy and repeatability of thermal expansion and contraction of the axis drives.
Method of assessing inaccuracy arising from thermal distortion of the machine in respect of distortion of the structure and also drift of the axis drive.
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