Sigma offers specialist capabilities and production processes finishing on a range of aerospace components.

In addition to Specialist Blisk Polishing and High Quality Precision Polishing, we provide a range of component finishing processes

We also offer:

CMM Inspection: Full dimensional measurement and reporting for turbine blades and aero engine components utilising two Sheffield Discovery CMM machines with ultrasonic thickness measuring capability.

Managed Services: Total management of final processes. In addition to the finishing procedures listed, NDT (non-destructive testing) Etching, and Shop Peening can be provided through approved suppliers.

A complete logistics service is also available to meet demanding delivery schedules.

For more information, please visit C & H Precision Finishers Ltd.


  • Turbine blades and other engine parts

  • One-off aircraft parts

  • Undercarriage landing gear parts


  • De-burring. Including raw investment castings, in a wide range of exotic metals and materials

  • Finished polishing. Including vibro-polishing and super-polishing to meet the most demanding quality levels.

  • Blasting. Sand blasting, shot blasting and vapour blasting, utilising process machinery capable of achieving a required finish on a wide variety of component types and sizes.