Thread ring gauge

Thread calliper gauge

Thread plug gauge

Thread snap gauge

By using screw thread micrometer

By using three wire method

By using slip gauge and precision roller

By using precision rolles and vernier calliper

Using pitch gauge

Using knife edge of vernier caliper

Using screw thread gauge

Using thread ring gauge

Core diameter = Major diameter - 2 depth

Core diameter = Major diameter - depth

Core diameter = Major diameter - minor diameter

Core diameter = Major diameter - pitch

On a saddle

On a carriage

On tool post

On the lathe bed