Ball Nose Spirals leave a rounded bottom during cutting while still providing a better shear cutting angle like their standard spiral counterparts. These are popular with small CNC’s but can be used in a router or router table. The up cut flute design pulls chips up and away from the work piece.

TOOL SPECS: Solid carbide, up cut, ball nose spiral with 3/8″ cutting diameter, 3/8″ shank, 3/16″ radius, 1″ cutting length, and 3″ overall length for use in routers with a 3/8″ collet.
BALL NOSE SPIRAL: Produces fully rounded bottom cuts with the tip of the bit, followed by straight edges with an up shear cutting angle to allow efficient chip ejection for optimal performance.
SOLID CARBIDE: Crafted from solid carbide for exceptional strength and long-lasting durability, ensuring reliable performance even in rigorous cutting tasks.
MATERIALS: Ideal for routing wood, composites, and hard plastics, offering versatility and precision for a variety of woodworking and crafting projects.
MACHINES: Designed for hand-held routers, router tables, and CNC machines in a wide variety of applications. Popular for 3D carving on a CNC.
SPECIAL APPLICATION: While very versatile and popular for 3D carving on a CNC machine, the ball nose design is a great option for routing juice grooves in cutting boards.

Whiteside catalog page 5.

Part No.	RU4100RN
Series	Ball Nose Up Cut Spiral
Description	Ball Nose Up Cut Spiral, 3/8" Shank, 3/8" Dia, 3/16" Radius, 1" CL
Shank	3/8"
Cutting Diameter	3/8"
Radius	3/16"
Cutting Length	1"
Overall Length	3"
Materials	Natural woods, composites, hard plastics
Recommended RPM	16,000-18,000 (max 24,000)

Part No.	Shank	Cutting Diameter	Radius	Cutting Length	Overall Length	Price
RU1800RN	1/4"	3/16"	3/32"	3/4"	2-1/2"	$34.87 Add to cart
RU2075RN	1/4"	1/4"	1/8"	3/4"	2-1/2"	$32.67 Add to cart
RU4100RN	3/8"	3/8"	3/16"	1"	3"	$74.31 Add to cart
RU5125RN	1/2"	1/2"	1/4"	1-1/4"	3"	$100.09 Add to cart
RU5200RN	1/2"	1/2"	1/4"	2"	4"	$119.93 Add to cart

Brand

Whiteside

Need This Tool Customized?

Every machining application is different. If this tool is close to what you need but not an exact fit, General Cutting Tools can help modify it for your specific job, machine, material, or production requirement.

We work with CNC shops, industrial manufacturers, tool rooms, and production facilities to provide tool modifications that improve fit, function, performance, and efficiency. Whether you need a small adjustment or a more specialized cutting tool solution, our team can review your requirements and recommend the best option.

Custom tool modifications can help reduce setup time, improve accuracy, extend tool life, solve clearance issues, and support more consistent production results.

Common Tool Customization Options

Diameter and OD Modifications

We can modify tool diameters to better match your application requirements, including cutting diameter changes, OD modifications, pilot diameter adjustments, step diameters, and shank diameter modifications.

Bore Modifications for Saw Blades

Custom saw blade bore modifications are available for hole diameter changes, pinholes, mounting holes, and keyway cutouts to help match your machine setup and cutting requirements.

Length Adjustments

Tools can be modified for specific reach, clearance, or setup needs. This may include overall length changes, flute length adjustments, reduced neck sections, extended reach designs, or shortened tools for improved rigidity.

Shank Modifications

Shank modifications can help ensure the tool fits properly in your holder, spindle, or machine setup. Common options include shank diameter changes, flats, Weldon flats, reduced shanks, and custom holding requirements.

Radius, Chamfer, and Corner Changes

We can customize corner radius, chamfer angles, edge breaks, and other profile details to meet part print requirements or improve cutting performance.

Step Tool Modifications

For applications that require multiple diameters or operations in a single tool, we can create or modify step tools to help reduce tool changes and improve production efficiency.

Flute and Cutting Edge Adjustments

Depending on the tool and application, flute length, cutting edge geometry, end cutting features, relief angles, and cutting edge shape may be modified to improve chip evacuation, cutting action, and tool performance.

Regrinding and Resharpening

Many cutting tools can be reground or resharpened to restore performance, extend tool life, and reduce replacement costs.

Custom Profiles and Special Forms

For unique part features, we can help provide special forms, custom profiles, custom radii, counterbores, countersinks, keyseat cutters, form tools, and other application-specific tooling solutions.

Material-Specific Tool Adjustments

We can help modify or recommend tooling based on the material being machined, including aluminum, brass, bronze, plastics, stainless steel, hardened steel, cast iron, composites, and other industrial materials.

Have a Drawing, Sample, or Part Print?

Send us your print, sketch, CAD file, photo, tool number, sample, or application details. For the fastest quote, include the material being cut, quantity needed, required dimensions, tolerances, and any machine or holder requirements.

Coating Options

Tool coatings can be selected or added to improve wear resistance, heat resistance, lubricity, and performance in specific materials such as steel, stainless steel, aluminum, cast iron, and high-temperature alloys.

Request a Custom Tool Modification

Need this tool changed for your application? Contact General Cutting Tools today to discuss your custom tooling needs. We can help you find the right solution for your machine, material, and production goals.

Now Hiring

Whiteside RU4100RN Ball Nose Up Cut Spiral, 3/8″ Shank, 3/8″ Dia, 3/16″ Radius, 1″ CL