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Over the last few years a number of software and hardware improvements havebeen implemented to the 32-m Cassegrain radio telescope located near Toru\'n.The 19-bit angle encoders have been upgraded to 29-bit in azimuth and elevationaxes. The control system has been substantially improved, in order to accountfor a number of previously-neglected, astrometric effects that are relevant formilli-degree pointing. In the summer 2015, as a result of maintenance works,the orientation of the secondary mirror has been slightly altered, whichresulted in worsening of the pointing precision, much below the nominaltelescope capabilities.  In preparation for observations at the highest available frequency of 30-GHz,we use One Centimeter Receiver Array (OCRA), to take the most accurate pointingdata ever collected with the telescope, and we analyze it in order to improvethe pointing precision.  We introduce a new generalized pointing model that, for the first time,accounts for the rail irregularities, and we show that the telescope can haveroot mean square pointing accuracy at the level ${<}8"$ and ${<}12"$ in azimuthand elevation respectively. Finally, we discuss the implemented pointingimprovements in the light of effects that may influence their long-termstability.

Improving pointing of Toru\'n 32-m radio telescope: effects of rail surface irregularities