Recognizing Different Types of Hole

Recognizing straight holes |
Recognizing tapped holes |
Settings for insert holes |
Recognizing countersunk holes |
Recognizing other types of hole |
Recognizing slotted holes |

Shape Elements Identified as Holes

In the machining service, the following shape elements are identified as holes. Elements identified as holes can be switched to straight holes or precision holes. If the hole diameter meets certain criteria, you can also switch to tapped holes, insert holes or countersunk holes. For one-step holes and two-step holes, the hole type can be changed at each step. See here for positions where a chamfer can be created in one-step and two-step holes. You can also specify the dimensional tolerance from the hole center.

Blind cylindrical shape
with flat hole base

Blind cylindrical shape with conical hole base

Blind cylindrical shape with flat hole base
+90° chamfer at entrance

Blind cylindrical shape with conical hole base
+90° chamfer at entrance

Through cylinder

Through cylinder
+90° chamfer at entrance

Through cylinder
+90° chamfer at entrance (both sides)

One-step hole

Two-step hole
(with center section the smallest)

Recognizing Straight Holes

Any shape that is identified as a hole, but is not initially recognized to be a tapped hole or a countersunk hole, is identified as a straight hole.

Settings for Precision Holes

Any shape identified as a hole can be changed to a precision hole by changing the hole diameter tolerance type of the straight hole. See here for more information about how to switch to precision holes.

Recognizing Tapped Holes

meviy sets the pilot-hole diameter based on the user-set “Tapped Hole Identification Settings” and the file extension (see table below). If the model’s hole diameter matches the settings, it is identified as a tapped hole.
If holes have not been automatically assigned as tapped holes at initial upload, you can also change the hole type manually as long as the hole diameter is within the threshold.
You can also change from tapped holes to straight or insert holes.
See here for the Tapped Hole Identification Settings.

Select “User Settings” in the user menu in the top-right of the screen.
You can change the settings from the “Tapped Hole Identification Settings” menu.
Once you have changed the settings, click “Change.”

For native files: select the CAD program used to create the file
For intermediate files: select the CAD program used to create the file
*In order to improve the accuracy of the automatic assignment of tapped holes, you should always try to select the original CAD program used to create the file.
Example: CATIA → SOLIDWORKS (upload) CAD Software Settings
✓ Select: CATIA
X Don’t select: SOLIDWORKS
*If the native file is different from the CAD software settings, the CAD software setting logic will be used for recognizing tapped holes.

Please note

It is recommended that you use the hole commands to model holes. The machining service is designed for modeling generated with the various CAD hole commands, and using the hole commands improves the accuracy of the automatic assignment of tapped holes.

(Automatic tapped-hole assignment can also be used when modeling with cutting. However, if there is any discrepancy in the logic, tapped holes cannot be automatically assigned, and holes may end up as straight holes or other types of hole.)

Please note (SOLIDWORKS users only)

The machining service refers to the CAD names in the SOLIDWORKS Tapped Hole Identification Settings as “SOLIDWORKS(A)” and “SOLIDWORKS(B).” The differences between the two are as shown below.

Select according to your modeling specifications.

If a user of modeling specification “SOLIDWORKS(B)” has set the CAD name to “Use file type” in the Tapped Hole Identification Settings, the “SOLIDWORKS(A)” logic will take precedence.

“SOLIDWORKS(B)” users must set the CAD name to “SOLIDWORKS(B).”

The tapped hole identification logic for the machining service is shown below.

*The machining service’s tapped hole identification logic is designed to round to three decimal places.

*The CAD in the following tables assumes the default versions of the following are used.

It may not work, depending on version upgrades and personal settings.

Autodesk Inventor 2023	Siemens PLM-NX 2206
CATIA V5-R62022	Solid Edge 2023
Creo 9.0	SOLIDWORKS 2023
Pro/Engineer 19.0	I-deas
Onshape 1.154.6978	iCAD SX V8L3-00A
Autodesk Fusion 2.0.10813	IRONCAD 2021

Automatic Tapped-Hole Assignment

Recommended Tapped Hole Identification Setting: CAD Software

Model Hole Diameter	(1) Upload Model: Native/Intermediate File
(ø) mm	(2) Tapped- Hole Identification Setting: CAD Name
Tap Size (Coarse)	Creo Onshape SW(A)	Solid Edge IronCAD	NX	CATIA V5 Inventor	SW(B) iCAD SX	Autodesk Fusion
M2	1.6		1.6	1.57	2	1.62
M2.5	2.05		2.05	2.01	2.5	2.08
M3	2.5		2.5	2.46	3	2.53
M4	3.3		3.3	3.24	4	3.33
M5	4.2		4.2	4.13	5	4.23
M6	5		5	4.92	6	5.04
M8	6.8		6.8	6.65	8	6.78
M10	8.5		8.5	8.38	10	8.53
M12	10.2		10.3	10.11	12	10.27
M14	12		12.1	11.84	14	12.02
M16	14		14	13.84	16	14.02

Not Recommended: Tapped- Hole Identification Setting "Use File Type"

Model Hole Diameter	(1) Upload Model: Native File
(ø) mm	(2) Tapped- Hole Identification Settings: Use File Type
Tap Size (Coarse)	Creo Onshape SW(A)	Solid Edge IronCAD NX	CATIA V5 Inventor	SW(B) iCAD SX	Autodesk Fusion
M2	1.6		1.57	2	1.62
M2.5	2.05		2.01	2.5	2.08
M3	2.5		2.46	3	2.53
M4	3.3		3.24	4	3.33
M5	4.2		4.13	5	4.23
M6	5		4.92	6	5.04
M8	6.8		6.65	8	6.78
M10	8.5		8.38	10	8.53
M12	10.2		10.11	12	10.27
M14	12		11.84	14	12.02
M16	14		13.84	16	14.02

Model Hole Diameter	(1) Upload Model: Native File
(ø) mm	(2) Tapped- Hole Identification Settings: Use File Type
Tap Size (Coarse)	STEP Parasolid ACIS JT PRC I-DEAS
M2	1.57/1.6/1.62/2
M2.5	2.01/2.05/2.08
M3	2.46/2.5/2.53/3
M4	3.24/3.3/3.33/4
M5	4.13/4.2/4.23
M6	4.92/5/5.04/6
M8	6.65/6.75/6.78/6.8/8
M10	8.38/8.5/8.53/10
M12	10.11/10.2/10.25/10.27/10.3
M14	11.84/12/12.02/12.1
M16	13.84/14/14.02/16

Tapped-Hole Manual Assignment

Tap Size(Coarse/Fine)	Model hole diameter (ø) mm
M2	1.5 to 2
M2.5	2 to 2.5
M3	2.4 to 3
M4	3.2 to 4
M5	4.1 to 5
M6	4.9 to 6
M8	6.6 to 8
M10	8.3 to 10
M12	10.1 to 12
M14	11.8 to 14
M16	13.8 to 16

*SW(A) when created with the SOLIDWORKS hole specification options “Screw pilot-hole drill diameter” and “Thread”
*SW(B) when created with the SOLIDWORKS hole specification option “Remove thread”

Settings for Insert Holes

When the quoted material is made of aluminum or resin, the machining service can select insert holes within the threshold using logic equivalent to the tapped-hole identification logic.

The insert material is 304 Stainless Steel

There are four nominal lengths for each diameter: 0.5D, 1D, 1.5D and 2D.

However, the number of selectable diameters is M2 to M12, unlike for tapped holes.

Recognizing Countersunk Holes

Conical shapes that meet the following conditions will be identified as countersunk holes.

Model the conical shape with an angle of 90°.

Set so that the hole diameter ratio D/d is:
greater than 1.4 (D>1.4d) when d is 4.0 [mm] or less.
greater than 1.7 (D>1.7d) when d is greater than 4.0 [mm].

Recognizing Other Types of Hole

The shapes shown below are recognized as other types of hole. The service is not available if these other types of hole are present.

Decreasing two-step hole

Non-90° entrance chamfer

Tapered hole

Oblique hole

Fillet at entrance

Machined thread

Recognizing Slotted Holes

The following shape elements are recognized as slotted holes. Shape elements recognized as slotted holes can be changed to precision holes using the dialog box. You can also specify the dimensional tolerance from the arc center.

Through-hole shape with width = 2R