Thread/Tap

The Thread/Tap capability creates threads or taps, depending on the cylindrical entity of interest.

This task shows you how to thread a cylindrical pad.
Open the Thread.CATPart document..
1.  Click the Thread/Tap icon .

The Thread/Tap Definition dialog box is displayed.

2.  Select the cylindrical surface you wish to thread, that is Face.1.

3. 

Select the upper face as the limit face. Limit faces must be planar.

The application previews the thread.
 

In the dialog box, the Geometrical Definition frame displays the name of the faces you have selected. The Reverse Direction button (as well as the arrow in the geometry area) lets you reverse the thread direction if needed.
  The Numerical Definition frame provides three different thread types:
No Standard: uses values entered by the user
Metric Thin Pitch: uses AFNOR standard values 
Metric Thick Pitch: uses AFNOR standard values
Metric Thin Pitch: AFNOR standard

Refer to (NF E03-053-1970). This normative reference is linked to  NF E03-051-1982) 

The application uses the minimum standard values. 
Nominaldiam  Pitch Minordiam M
8.0 1.0 6.917  
9.1 1.0 7.917  
10.0 1.25 8.647  
12. 1.25 10.647  
14.0 1.5 12.376  
16.0 1.5 14.376  
18.0 1.5 16.376  
20.0 1.5 18.376  
22.0 1.5 20.376  
24.0 2.0 21.835  
27.0 2.0 24.835  
30.0 2.0 27.835  
33.0 2.0 30.835  
36.0 3.0 32.752  
39.0 3.0 35.752  

Metric Thick Pitch: AFNOR standard

Refer to (NF E03-053-1970). This normative reference is linked to  NF E03-051-1982) 

The application uses the minimum standard values. 

Nominaldiam       

 Pitch Minordiam M
1 0.25 0.729  
1.1 0.25 0.829  
1.2 0.25 0.829  
1.4 0.3 1.075  
1.6 0.35 1.221  
1.8 0.35 1.221  
2.0 0.4 1.567  
2.2 0.45 1.713  
2.5 0.45 2.013  
3.0 0.5 2.459  
3.5 0.6 2.850  
4.0 0.7 3.242  
4.5 0.75 3.688  
5.0 0.8 4.134  
6.0 1.0 4.917  
7.0 1.0 5.917  
8.0 1.25 6.647  
9.0 1.25 7.647  
10.0 1.5 8.376  
12.0 1.75 10.106  
14.0 2.0 11.835  
16.0 2.0 13.835  
18.0 2.5 15.294  
20.0 2.5 17.294  
22.0 2.5 19.294  
24.0 3.0 20.752  
27.0 3.0 23.752  
30.0 3.5 26.211  
33.0 3.5 29.211  
36.0 4.0 31.670  
39.0 4.0 34.670  
42.0 4.5 37.129  
45.0 4.5 40.129  
48.0 5.0 42.587  
52.0 5.0 46.587  
56.0 5.5 50.046  
60.0 5.5 54.046  
64.0 6.0 57.505  
68.0 6.0 61.505  
72.0 6.0 65.505  
76.0 6.0 69.505  
80.0 6.0 73.505  
85.0 6.0 78.505  
90.0

 

 6.0 83.505  
4. For the purposes of our scenario, keep No Standard. As you are creating a thread, you cannot modify the thread diameter value. If you were creating a tap, you could modify it.

When creating taps, if you wish to use values already defined in one of your files, click the Add button to access this file. A dialog box displays, in which you can navigate to reach the file containing your own values. This file may be of one of the following types: 

Excel files (general format)
Lotus files
tabulated files (in Unix environment)

For more about using predefined values, refer to Threaded Holes, steps 7 and 8. The operating mode described in this task is valid for threads and taps too.
  5.  Enter 49 mm as the thread depth.

Note that the Support Diameter and Support height fields are grayed. They are merely informative.
  6.  Enter 1.5 mm as the pitch value. The Pitch field  defines the distance between each crest.
  7.  Check the Left-Threaded option.
  8. 

Click Preview.

Red lines provide a simplified representation of the thread.
 

  9.

Click OK to confirm.

There is no geometrical representation is the geometry area, but the thread (identified as Thread.xxx) is added to the specification tree. The corresponding icon is specific to this feature.

  Diameter,  depth and pitch values appear below the Thread entity in the specification tree.
 

  If you create a tap, CATIA identifies it as Thread.XXX too in the specification tree, but displays a specific icon as shown below:
 

  Notes
You can extract drawings from threads and taps in the Generative Drafting workbench. For more, see Generative Drafting User's Guide Version 5.
You obtain a hole, not a tapped hole, by removing a threaded cylinder from a body. 
 

Cavities on cylindrical surfaces

If the cavity is a hole, proceed using the options available in the Hole Definition dialog box as described in Threaded Holes.
If the cavity is a groove or a pocket defined on a cylindrical surface, you must use a plane tangent to the surface as the limit face.

 
Back Up