Threading operations

1
Threading operations

• Taps
• Dies
• Thread cutting

2

• External thread

• Internal thread

3
Pitch

• The distance from a point on a screw thread to a
  corresponding point on the next thread.
• Pitch 1.0/threads per inch

4
Threads Fits

• Threads are classified by the accuracy of form
  and fit compared to a theoreticly perfect
  thread.
• Application dictates thread class requirements

5
General anatomy of threads

• Pg 91 ST

6
Different forms

• Acme

• Buttress

• Taper

• Square

7

• Tap- threaded tool with external flutes

• Die- Internally threaded tool

8
Tap types

• Taper

• Plug

• Bottom

9
Thread cutting on Lathe

• External

• Internal

10
Tonights operation

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