Finishing and Grinding

Finishing and Grinding

About sixty percent of the coatings sold by PTI are used in the ´as coated´ condition. The balance are used in some ´finished´ condition depending on application specifics. Finishing of most of these


	materials requires extensive knowledge and is technique dependent. To that end, PTI has developed extensive finishing capability and we prefer that PTI bring parts to ´end use´ condition.

Among the techniques employed by PTI are:

Brush Finishing: Non metallic ´brushes´ impregnated with abrasives (Diamond, Silicon Carbide) are used to ´round´ the surface particles and impart a ´Nodular´ finish. This is usually a non-dimensional technique with finishes of 60-125 RMS depending on coating type.

Diamond Polish: Diamond belts are used to produce surface finishes of 8-30 RMS depending on coating type. Typically a ´non-dimensional´ finish, but is sometimes used as a final polish step.

Diamond Grinding and/or Lapping: High concentration diamond wheels or paste is used. Virtually any finish can be achieved and dimensional tolerance of .0005" is common.

This is probably the most technique dependent type of finishing and the easiest way to damage the coating.

Diamond Honing: A rapid technique to achieve mid range surface finish of 16-32 RMS. Typical tolerance capability is +/- .001".

Super Finishing: PTI employs several different types of super-finishes. The objective of each is to attain surface finish of 2 RMS or less. Parts are usually finished by one of the other techniques and super-finished to obtain final polish only. This is a slow technique.


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