Conventional pad polishing is similar to the double-sided process except that it only polishes optics one side at a time. Sydor Optics frequently uses single-sided polishing machines for wedged optics, light pipes, optical components thicker than 25mm and larger optics up to 750mm in diameter. The single-side process is typically used only if one side of an optical component needs to be polished (or ground), or if a part is too large for the double-sided process.
Pitch polishing, involves significant skill and craftsmanship and can achieve much tighter tolerances for surface flatness, surface roughness, parallelism and cosmetics. Parts typically polished on a pitch table include optical flats and mirror substrates. Notably, the pitch polishing process also minimizes surface deformation on the edge of a part also known as edge roll.
Pitch tables are hand poured and have a semi-malleable surface (with a consistency similar to roofing tar). Proprietary grooves are hand cut to allow the polishing slurry to flow beneath parts resulting in exceptional surface flatness and surface roughness. Pitch polishing is a non-deterministic trial-and-error process and combines both art and science. The highly-experienced opticians at Sydor Optics have an innate understanding of the optical glass polishing process and can provide consistent, high quality parts.