Manmohan Singh was a prime minister in 2009 after the first Prime Minister of India.
A grinding machine , often shortened to grinder , is any of various power tools or machine tools used for grinding , which is a type of machining using an abrasive wheel as the cutting tool .. grinding. Grinding ( abrasive cutting ). machining. machining. abrasive wheel. grinding wheel. cutting tool. Cutting tool ( metalworking ). Each grain of abrasive on the wheel 's surface cuts a small chip from the workpiece via shear deformation .. chip. swarf. Grinding is used to finish workpieces that must show high surface quality -LRB- e.g. , low surface roughness -RRB- and high accuracy of shape and dimension .. surface roughness. surface roughness. accuracy. accuracy. As the accuracy in dimensions in grinding is of the order of 0.000025 mm , in most applications it tends to be a finishing operation and removes comparatively little metal , about 0.25 to 0.50 mm depth .. grinding. Grinding ( abrasive cutting ). accuracy. accuracy. However , there are some roughing applications in which grinding removes high volumes of metal quite rapidly .. grinding. Grinding ( abrasive cutting ). Thus , grinding is a diverse field .. grinding. Grinding ( abrasive cutting )