Use Indexed Setups When the Geometry Supports Them

3+2 describes a machining strategy, not a guarantee of cost, accuracy or cycle time. Review it against the features and acceptance requirements.

Index to Reach Angled Features

The part or tool is positioned to an angle before cutting. This may provide access to several faces without describing the job as continuous five-axis cutting.

Define the Setup Datums

Show the datums and relationships that locate angled faces, holes and critical interfaces between indexed positions.

Keep Tolerances on Functional Features

Identify dimensions that control assembly or fit and state their requirements on the drawing for review.

Compare with Continuous Five-Axis Work

Some paths require coordinated axis movement during cutting; others can use indexed positions. Geometry and finish needs determine the appropriate strategy.

How 3+2 Axis CNC Machining Works

What 3+2 machining describes

In 3+2 axis CNC machining, the machine positions the workpiece or tool at an angle and then performs a cut using the three linear axes. The orientation is indexed between operations. This differs from continuous five-axis machining, where multiple axes move in coordination during a cutting path.

When indexed positioning may be considered

Indexed setups can be considered when features on several faces need access but the tool orientation does not need to change continuously during the cut. The choice depends on feature locations, clearances, datums and surface requirements. A part should not be assigned to 3+2 only because it has angled faces.

Make datum relationships explicit

Show how the part is located and identify the dimensions that relate features across faces. Critical bores, holes, pockets and interfaces should be called out from clear datums. Include section views or notes where they explain the intended setup or feature relationship.

Compare neighboring process options

Review our continuous 5-axis machining page for paths that require coordinated motion. The 5軸ミリング能力 page covers the broader process scope. These pages address different machining strategies and should not be treated as interchangeable terms.

Submit the part for review

Provide the 3D model and drawing with material, quantity, datums, critical dimensions, finish and inspection requirements. The team can assess tool access and setup strategy for the specific part. Tolerances and acceptance criteria are confirmed against the drawing rather than assumed from the process name.

3+2 Axis CNC Machining Questions

Indexed positioning and continuous five-axis cutting are different approaches.

What does 3+2 axis CNC machining mean?

+

The machine indexes the tool or workpiece to an angle, then cuts using the three linear axes. The angle is changed between operations rather than continuously during the cutting path.

How is 3+2 machining different from continuous 5-axis machining?

+

3+2 uses indexed positions between cuts. Continuous five-axis machining coordinates multiple axes during a cutting path. Geometry and tool access determine which strategy may suit a part.

Does every angled part need 3+2 machining?

+

No. Some angled features can be reached through simpler setups, while others may require indexed or continuous multi-axis strategies. The drawing and model need to be reviewed.

What should a 3+2 machining drawing include?

+

Include datums, critical dimensions, material, quantity, finish and inspection needs. Show how features relate across faces and add section views where they clarify geometry.

Can 3+2 machining guarantee a specific tolerance?

+

No tolerance should be assumed from the process label. State critical dimensions on the drawing so the route and inspection plan can be reviewed for the specific part.

見積もりを依頼