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Long Reach Ball Nose End Mill Specifications
A long reach ball nose end mill combines ball-end geometry with an extended neck section for features that require additional clearance and access.
The catalog includes multiple combinations of ball radius, flute length, effective length and neck diameter. Therefore, use the specifications below for initial selection rather than treating every dimension as freely interchangeable.
| Specification | Catalog Range |
|---|---|
| Ball Radius | R0.1–R2.0 mm |
| Ball Diameter | Ø0.2–4.0 mm |
| Flute Length (L1) | 0.2–4.0 mm |
| Effective Length (L2) | 1–30 mm |
| Neck Diameter | Ø0.16–3.9 mm |
| Shank Diameter | Ø4 / Ø6 mm |
| Overall Length | 50 / 60 / 75 mm |
Standard catalog radius options include R0.1, R0.15, R0.2, R0.25, R0.3, R0.4, R0.5, R0.75, R1.0, R1.5 and R2.0. However, the available length and neck combinations depend on the catalog series.
For the broader product family, see Long Reach End Mills.
Long Reach Ball Nose Geometry and Reduced-Neck Design
Ball Nose Cutting Geometry
The rounded cutting end follows curved surfaces and three-dimensional features where a flat cutting end would not match the required profile.
For general ball nose milling without an extended-reach requirement, see Ball Nose End Mills.
Reduced Neck and Long-Reach Clearance
Long-reach catalog configurations use an extended neck section behind the cutting end. When the neck diameter is smaller than the cutting diameter, this reduced section provides additional clearance from surrounding walls.
As a result, the cutting end can reach deep or restricted features without requiring a long cutting edge along the entire exposed section of the tool.
Long reach, long neck and reduced neck describe related but not identical characteristics. Therefore, confirm the actual neck diameter, effective length and tool dimensions for the selected model rather than relying on the product name alone.
Ball Radius and Effective Length Selection
Radius and Diameter Relationship
Ball nose tools are commonly specified by radius. For the catalog sizes shown on this page, the ball diameter corresponds to twice the radius:
D = 2R
For example, R0.5 corresponds to a Ø1.0 mm ball diameter. Likewise, the catalog range from R0.1 to R2.0 corresponds to ball diameters from Ø0.2 to Ø4.0 mm.
Choose the radius according to the required feature geometry and contact profile.
For broader selection considerations, see How to Choose a Ball Nose End Mill.
Effective Length and Neck Diameter
Effective Length (L2) becomes an important purchasing dimension when the cutting area sits below surrounding walls or inside a narrow cavity.
A longer effective length provides additional access. Meanwhile, the neck diameter determines the available clearance around the tool body.
Because the available L2 and neck-diameter combinations vary by catalog size, confirm the ball radius, effective length and neck diameter together instead of selecting each value independently.
Applications for Long Reach Ball Nose End Mills
Deep Cavity and Mold Finishing
Long reach ball nose end mills suit features where the rounded cutting end must reach below surrounding surfaces.
Typical applications include deep cavities, deep pockets, recessed mold features and other areas where a standard tool body may interfere with the workpiece.
In these situations, the long-neck section provides clearance above the cutting area, while the ball nose reaches curved bottoms, transitions or contoured surfaces inside the cavity.
3D Contours and Curved Surfaces
Ball nose geometry also suits 3D contour milling and curved-surface machining.
When the required surface lies inside a deep or restricted feature, the long-reach structure provides additional access while retaining the rounded cutting geometry required by the profile.
However, additional reach should match the actual part geometry. Selecting the longest available configuration is not automatically the correct choice.
Long Reach Ball Nose vs Standard Ball Nose End Mill
Both tools use ball nose cutting geometry. However, the required access and surrounding workpiece geometry determine which structure is more suitable.
| Selection Point | Long Reach Ball Nose | Standard Ball Nose |
|---|---|---|
| Main Difference | Extended or reduced-neck access | Standard tool reach |
| Neck Clearance | Additional clearance for restricted features | Suitable where normal access is sufficient |
| Typical Feature | Deep or recessed features | Accessible curved or 3D features |
| Selection Focus | Radius + effective length + neck diameter | Radius + standard cutting dimensions |
A standard ball nose end mill is suitable when the tool body can reach the feature without interference. By contrast, a long-reach configuration is more appropriate when surrounding walls or recessed geometry require additional neck clearance.
Custom Long Reach Ball Nose End Mills
Standard catalog sizes cover multiple combinations of ball radius, flute length, effective length, neck diameter, shank diameter and overall length.
For non-standard requirements, send a drawing or sketch showing the required geometry and dimensions. We can then review the requested configuration before quotation and assess its manufacturing feasibility.
Custom sizes and configurations are subject to drawing review and manufacturing feasibility.
FAQ
Are long reach and long neck ball nose end mills the same?
The terms often overlap, but they do not always describe exactly the same geometry. Long reach emphasizes access, while long neck describes the extended neck section. Therefore, check the actual effective length and neck dimensions when selecting a tool.
What is the difference between a long reach and a reduced-neck ball nose end mill?
Long reach describes the requirement for additional access. Reduced neck specifically describes a section behind the cutting end with a smaller diameter for additional clearance. Some long-reach ball nose tools use this structure, but the exact geometry should be confirmed from the dimensions or drawing.
How do I choose the ball radius and effective length?
First, use the required surface or feature geometry to determine the ball radius. Next, select an effective length that reaches the machining area while providing the required access. The neck diameter should also be checked because available dimension combinations vary by catalog size.
Can you supply micro-diameter long reach ball nose end mills?
Yes. The current catalog includes ball radii starting from R0.1 mm, which corresponds to a Ø0.2 mm ball diameter. However, the available effective-length and neck-diameter combinations depend on the selected catalog size.
For broader small-diameter tooling options, see Micro End Mills.
Can you manufacture custom long reach ball nose end mills from a drawing?
We can review custom radius, diameter, length and neck configurations based on your drawing or machining requirements. We confirm manufacturing feasibility before finalizing the custom specification.
Send Your Long Reach Ball Nose End Mill Inquiry
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