Abstract: A recognition apparatus and method are provided for identifying the type of work piece loaded onto the rotating shaft chuck of an ophthalmic product generator. A digital electronic system supplies signals which control the angular displacement of the chuck. Each type of work piece has a unique pattern of passages aligned on a plane transverse to its rotational axis which rotate into and out of alignment with a single registration line in the plane. Unique signature data which identifies each type of work piece by the angular positions at which the passages come into and go out of alignment with the registration line is stored in the digital electronic system. A beam of light, preferably infrared, is continuously transmitted along the registration line during a signature rotation of the chuck. The angular positions of the loaded work piece and the status of an electrical signal generated when the light beam passes through the passages are detected and stored in the digital electronic system.

Abstract: In a linear feedback servo control system, the motion profile for each axis is pre-filtered before it is introduced to the servo loop for that axis. The motion profile is pre-filtered by a filter having an inverse amplitude response to the amplitude response of the servo loop. Therefore, the composite amplitude response of the filter/servo loop combination is approximately ideal for all relevant frequencies. The pre-filtering is done using constant delay filters, whether high pass, low pass or hybrid, that exhibit a phase lag corresponding to a time delay that is essentially constant at all relevant frequencies. Each axis of synchronized motion is pre-filtered with constant delay filters having the same time delay constant, but selected so that the motion of each axis provides sufficient accuracy within the intended bandwidth of that particular axis. Consequently, while phase lag is not zero, there is essentially constant delay for all axes at all relevant frequencies.

Abstract: A method of speed optimization of a spindle component of a machine having multiple synchronized components moving along multiple axes over a motion profile.