WebPrecision Pitch Polishing. Pitch polishing is similar to the double-sided processexcept … WebMar 6, 2024 · The Grating Period (pitch) of the optical scales, we also call it the physical grating pitch. Grating refers to the measurement reference of a grating ruler or encoder, that is, a periodic grating. Optical encoders generally have two types of substrates, namely metal tape and glass tape. The grating is a series of stripes and slits made on a ...
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