<p>We focus on the subaperture polishing tool concept development for suppressing midspatial frequencies (MSF) arising from computer numerical control machining of aspherical optical surfaces. The selective effect in the MSF range is achieved by setting the tool viscoelastic properties so that rigidity increases in the frequency-domain generated by the rotational tool movement over the aspheric surface with the MSF while the tool remains flexible in the lower frequency range associated with tool radial direction movement. The mechanism of MSF removal is discussed in detail, including in terms of elasticity module frequency dependences, and is also experimentally verified. In order to monitor and optimize viscoelastic properties, especially in regard to frequency dependences, the dynamic mechanical analysis method has been developed and applied and is presented in the paper as well.</p>
The work deals with the creation of correction data when generating spherical and aspherical surfaces. Generation is performed on the converted 5-axis milling machine, for which it is necessary to generate control programs. In the process of generating surfaces may be formed random errors. Hence the need to measure workpieces, and errors corrected. There is thus solved a measurement of generated surface on coordinate measuring machine Mitutoyo LEGEX 744 and draft methods of data processing by using polynomial of nth order. The measured data are processed by Matlab, specifically CFTool module. This method is further tested and subsequently the experiment evaluated.