Creating Threaded Holes

1. Click the Hole icon if you wish to create a hole in Part Design, or click the Hole icon to create a hole in Functional Molded Part.

2. Select the face on which you wish to create the hole.

3. In the Hole Definition dialog box that displays, define the hole shape and enter the parameters of your choice. For more information, refer to Creating Holes.

4. Select the Thread Definition tab.

5. Select the Threaded check box to access the thread definition options.

6. In the Type field, you can choose among three different thread types:

   No Standard: uses values entered by the user Metric Thin Pitch: uses ISO standard values  Metric Thick Pitch: uses ISO standard values

   In addition to these three types, you can add your personal standards as described in Reusing Values Already Defined in a File.

7. Set your own file containing personal standards in the Type field.

• You can modify a standard on the fly. But if the standard has already been used, the modification is not taken into account in the Hole Definition and Thread Definition dialog boxes.
• While selecting a standard thread type in the Type field:
  • If the diameter of a hole set by you in the Extension tab is matching with the thread standards, the related thread description automatically gets selected as per the thread standards.
    For example, enter 12.376mm in the Hole Diameter field and then select Metric Thin Pitch as thread type. The related parameter M14X1.5 corresponding to the 12.376mm hole diameter gets selected in the Thread Description field.
  • If the diameter of a hole set by you in the Extension tab does not exist in the standard file, a warning message is displayed. In this case, the diameter is set to the first value in the standard file.
    For example, enter 15mm in the Hole Diameter field and then select Metric Thick Pitch as thread type. The following warning message is shown:
    
    Value 15mm does not exist in selected standard. Diameters will be set with the first line of the standard.

Do not modify a standard (a .txt file) after using it. We recommend you create a new standard instead.

8. If necessary, edit the thread depth then the hole depth if you need to modify the value you had previously set in the Extension tab. This value must not exceed the thread diameter value.

9. Select the Left-Threaded option.

10. Click OK to confirm your operation and close the Hole Definition dialog box.
    The application displays the hole in the geometry area but not the thread. Note also that an icon specific to this feature is displayed in the specification tree.

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 Bottom Type frame provides three different options to set depth:

The Bottom Limit option specifies the bottom limit for the element. This option is only available with the Up-To-Plane bottom type. It has a contextual menu in order to create a planar element on the fly. The Thread Depth field will get disabled with the selection of Up-To-Plane or Support Depth option.

The Bottom Limit element must be planar and parallel to the Limit Face.

Thread Types

No Standard

If you keep the No Standard option, the field available below is Thread Diameter. You just need to enter the values you need in this field as well as in the fields below.

The Edit formula... contextual command is available from the Thread Diameter field, meaning that you can define formulas for managing diameters values.

Metric Thin Pitch: ISO standard

Refer to ( ISO 965-2 ). The application 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
20.0	2.0	17.835
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

Refer to ( ISO 965-2 ). The application 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

Note: You can create a new standard as per the requirement. For more information, see Administration: Creating Hole Standards.

Reusing Values Already Defined in a File

To access values listed in a .xml file, the system administrator must have made the data required 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 Hole Depth) if needed.

A Few Words About Removing Files

The Remove button removes files containing user-defined values. You cannot remove files containing standard values.

Clicking the Remove button displays the list of user-defined files. You then just need to select or multi-select (using ctrl key) the files and click OK to confirm the operation.

Note also that you cannot remove a standard file if it is used for a hole created in the CATPart document.

Threading Counterbored Holes

The thread depth value you enter to thread counterbored holes does not apply to the counterbored part of the hole. The thread depth for counterbored holes corresponds to the distance shown by the yellow arrow on the help image:

Threading Tapered Holes

You can thread tapered holes in the same way as you thread any other hole types. Once you have selected a tapered hole, the image in the dialog box assists you:

The following figure illustrates how the different parameters you need to value are defined:

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