When it's time to clean the old finish (or rust) from metallic components, there's little to compare with media blasting. While the media used can be task-specific, cabinets are universal. They act to contain the blasted media and are an invaluable addition to any shop. If you're thinking of building one, you'll find these videos interesting:

Homebuilt blast cabinet by SAWBLADE64

Making Sand Blasting Cabinet (and using it) by Aykut Cantürk

How to make a Blasting Gun and Cabinet for Sand Blasting or Soda Blasting parts by Ichiban Moto

Homemade sandblasting cabinet by George Gallagher

Building a sand blasting cabinet by Dragracer64

Home made abrasive blasting cabinet by Mark Quimby