Centre for Advanced Technology has taken up the development of medium capacity Turbo Molecular Pump of pumping speed of 400 lt./s. A theoretical study has been conducted regarding the various parameters of TMP rotor geometry. To assess the theoretical predicted data, an experimental set up has been designed, fabricated and assembled. This is a single stage TMP rotor evaluation machine to check the performance of individual stage of TMP rotor .The top stage of rotor is being mounted in this set up and the various rotor geometry parameters has been tested up to a rotational speed of 40,000 rpm. The effect of rotor speed and the base pressure on pumping speed and compression ratio will be reported in this paper along with the details of experimental set up and procedure.
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