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Whether you’re using step ferrules or conical ferrules, you may have problems achieving consistent results for the 4 basic geometric characteristics – Radius, Angle/Apex, and Key Error – that are relevant to the APC polishing process. The following paragraphs offer troubleshooting tips to overcome common polishing issues.

Equipment checks:

  • Rubber pads – If the pads are more than 6 months old, they may show uneven wear. This wear will negatively affect Radius and Apex/Angle results. The replacement schedule is dependent upon use. It is best determined by monitoring Radius and Apex statistics, and replacing rubber pads when values approach control limits. For time-based replacement schedules, I’d recommend every 6 months for moderate-to-heavy use and no longer than 1 year for low-to-moderate use.
  • The fixture – Holes in the fixture will wear out over time (generally 3 to 5 years), which can impact parameters (mostly Angle/Apex). Pin gauges can be used to monitor hole diameters, but since wear is often not symmetrical, it’s difficult to quantify hole roundness/ovality. Often, the best way to verify that hole-wear is still acceptable is to return the plate to the manufacturer for measurement or try a new “loaner” fixture and see if results improve significantly.
  • Plastic clips in the polishing fixture – These can wear out or break and should be replaced periodically. Also, operators should always ensure connectors click into place properly.


READ THE FULL BLOG ARTICLE HERE: Steps to Overcome Common APC Polishing Issues


Additional resources from the FOC team include:

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Kathleen Skelton

About Kathleen Skelton

Kathleen Skelton, as FOC's Director of Strategic Marketing, utilizes her expertise in business development, online strategy, market planning, digital best practices, standard operating procedure development, and content management. A graduate of Curry College, she holds degrees in Communications and Education, English and Psychology. Kathleen resides outside of Boston, MA with her husband and four children. Follow @KATHLEENSKELTON