Cost Savings Through Flexibility Manufacturing costs and timelines are always under tight scrutiny. At A&H Duffy we believe that giving you options at every point of the process allows for more control over the 2 things that ultimately determine your success. With 6 Levels of Polishing ranging from rough grinding to a flawless mirror finish, we can match the right Polishing Method, with the right Polishing Level to achieve a profitable cost structure.
#3 Finish Grain finish. Also called Grinding, Roughing or Rough Grinding Very coarse finish. The material is polished to a uniform finish between 60 and 180 grit.
#4 Architectural Finish Also called Brushed, Directional or Satin Finish. A #4 Architectural Finish is characterized by fine polishing grit lines that are uniform and directional in appearance. It is produced by polishing the metal with a 120 – 180 grit belt or wheel finish and then softened with an 80 – 120 grit greaseless compound or a medium non woven abrasive belt or pad.
#4 Dairy or Sanitary Finish This finish is commonly used for the medical and food industry – almost exclusively used on stainless steel. Great care should be taken in removing the surface defects in the metal – like pits – that could allow bacteria to grow. This finish is produced by polishing with a 180 – 240 grit belt or wheel finish softened with 120 – 240 grit greaseless compound or a fine non woven abrasive belt or pad.
#6 Finish Buffed finish. Some light grain. Some haze. This finish is produced by polishing with a 220 – 280 grit belt then buffed with a sisal to create a uniform buffed finish.
#7 Finish Smooth buffed finish with a very bright appearance. Very light haze. The part is belt polished with a 280 – 320 belt then buffed with a cut and color compound. This is a common finish in preparation for chrome plating. A #7 finish can be made bright by color buffing with coloring compound and a cotton buff. This is a good way to keep polishing costs down when a part needs to be shiny but not flawless.
#8 Mirror Finish “Mirror” bright finish with clear reflection – No haze. All surface defects are removed. The part is buffed and then color buffed to achieve a mirror finish. The quality of this finish is dependent on the quality of the metal being polished. Castings that have pits will be difficult – if not impossible polish to a #8.
