Automatic electronic microprocessor based sample polishing machine with a fifty method memory providing up to six steps per method and six preinstalled fifty methods for laboratory use comprising a fully automatic sample preparation system including a plurality of platens arranged for automatic selective use seriatim for polishing metallographic and ceramographic test samples to prepare them for microstructural analysis and up to forty four different user derived methods for sample preparation stored electronically for retrieval and subsequent use but not for use as an abrasive tool or grinding wheel in international 7.;