Threading operations

TapsDies

Thread cutting

External thread Internal thread

Pitch

The distance from a point on a screw thread to a corresponding point on the next thread.

Pitch = 1.0/threads per inch

Threads Fits

Threads are classified by the accuracy of form and fit compared to a theoreticly perfect thread.

Application dictates thread class requirements

General anatomy of threads

Pg 91 ST

Different forms

Acme Buttress

Taper Square

Tap- threaded tool with external flutes

Die- Internally threaded tool

Tap types

Taper Plug Bottom

Thread cutting on Lathe

External Internal

Tonights operation

Debur Material Drill tap hole on mill Tap using tap chuck and guide bushing