About Creating Threads and Taps

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

This page discusses:

See Also
Creating Threads and Taps
Analyzing Taps and Threads

Thread Types

Thread and tap definitions do not depend on the polarity of the cylinder geometry. The Thread/Tap capability lets you specify whether you want to create a thread or a tap by selecting the appropriate option.

You can choose among these thread types :

  • No Standard
  • Metric Thin Pitch: uses ISO standard values
  • Metric Thick Pitch: uses ISO standard values.
No Standard

If you select No Standard, the following options are available:

  • Thread diameter
  • Support diameter
  • Thread depth
  • Support height
  • Pitch

You need to enter the required values in these boxes.

Note that a number of contextual commands are available from these boxes. For example, Edit formula... lets you define formulas for managing diameters values.

Metric Thin Pitch: ISO standard
See ISO 965-2. The app uses the minimum standard values.
Nominaldiam Pitch Minordiam
8.0 1.0 6.917
10.0 1.0 8.917
10.0 1.25 8.647
12.0 1.25 10.647
12.0 1.5 10.376
14.0 1.5 12.376
16.0 1.5 14.376
18.0 1.5 16.376
18.0 2.0 15.835
20.0 1.5 18.376
22.0 1.5 20.376
22.0 2.0 19.835
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
42.0 3.0 38.752
45.0 3.0 41.752
48.0 3.0 44.752
52.0 4.0 47.67
56.0 4.0 51.67
60.0 4.0 55.67
64.0 4.0 59.67
Metric Thick Pitch: ISO standard
See ISO 965-2. The app uses the minimum standard values.
Nominaldiam Pitch Minordiam
1 0.25 0.729
1.2 0.25 0.929
1.4 0.3 1.075
1.6 0.35 1.221
1.8 0.35 1.421
2.0 0.4 1.567
2.5 0.45 2.013
3.0 0.5 2.459
3.5 0.6 2.850
4.0 0.7 3.242
5.0 0.8 4.134
6.0 1.0 4.917
7.0 1.0 5.917
8.0 1.25 6.647
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
Notes:

Reuse Values Already Defined in a File

To use values listed in an xml file, the system administrator must have made the required data available. For reference information, see Creating Thread Standards.

If this step has been done, you just need to select the file from the Type list, and optionally edit one or more values (Thread depth and Support height) if needed.

Important: You can extract drawings from threads and taps in Drafting. For more information, see Drafting User's Guide.

Thread Mode

You can use a planar geometrical element as limiting thread/tap depth element or set the thread depth with the length of the support. The Thread mode list provides three different options to set depth:

  • Dimension: The depth is defined by setting a value in the Thread Depth box.
  • Support depth: The depth of the thread is automatically set according to the height of the support.
  • Up-To-Plane: The depth is computed with the selected bottom limit element.

The Thread limit box is available with Up-To-Plane type. Selecting the thread limit element lets you manage the thread bottom limit. The Thread Depth box is unavailable with Up-To-Plane and Support Depth options.

The thread limit element must be planar and parallel to the limit face.

Create Threads on Conic Faces

You can create threads on conic faces. The following figures illustrate how the different parameters you need to value are defined:

Threads



Note that if the thread diameter value is not equal to the support diameter at the limit plane, the app displays an error message.

Taps



The thread diameter must be greater than the support diameter at the limit plane, otherwise, the app issues an error message.

Cavities on Cylindrical Surfaces

  • If the cavity is a hole, proceed using the options available in the Hole.x dialog box as described in Creating 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.

Use Formulas

The Edit formula contextual command is available from the different Numerical Definition boxes. It allows you to define formulas for managing different values you need.

When accessing the Formula capability , the following parameters related to thread features can be assigned a value: 

  • RotationSide
    : the possible values are True or False. 
  • StandardType
    : you need to enter the standard type you want in the Edit name or value of the current parameter box of the Formulas dialog box. The standard you enter must be available in the document, otherwise the standard attribute is reset and set to No Standard. 
  • InternalDiameter:
    (This parameter is unavailable when defining a thread or tap feature). If you are handling a thread:
    • for which a standard is defined, it contains the minor diameter standard value.
    • for which NO STANDARD is set, it is not set as it is not defined.
    In case you are handling a tap:
    • for which a standard is defined, it contains the standard nominal diameter.
    • for which NO STANDARD is set, it is not set as it is equal to the diameter support.

User Features and Power Copies

User Features do not support standards used in the definition of thread features.