Manufacturing Knowledge Base

The screw form as used in manufacturing has two primary functions - to transmit power and motion, as with a lead screw on a machine tool, and as threaded fasteners such as nuts, screws, and bolts.

This Threading program examines the many dimensions that make up all threads, as well as segments on eternal threads, internal threads, and thread quality & verification.

The Threading Introduction segment examines the various thread dimensions, such as the major diameter, minor diameter, thread pitch, thread pitch diameter, percent of thread, thread angle, screw lead, thread shape, and thread tolerances & allowances.

The External Threads segment explores the methods in which external thread are produced, including: hand threading using solid or adjustable dies, thread turning using various infeeds, thread chasing, thread milling using helical interpolation, thread grinding, and thread rolling using flat plate rolling, radial/cylindrical thread rolling, or thread rolling attachments.

The Internal Threads segment details the taps and tapping operations, including: manual tapping, the use of flexible arms, tapping machines, drill & tap centers, and multi-spindle tapping. Segments on floating tap heads, rigid/synchronous tapping, special tapping heads, and tap nomenclature is also featured.

The Thread Quality & Verification segment covers the various levels of inspections, the gages used, and the mechanical and non-destructive testing processes used to verify threaded parts.