Like most end mill types, Ball End Mills are available in the indexable style where they use inserts that are cheap to replace. And, like most other indexable tooling, they will be lower performance than the equivalent solid end mill.

Spiral blades on mounted basket aggressively engage the soil to break up clods, seal moisture and even incorporate chemicals. Basket leaves a surface condition to resist crusting and reduce soil and water erosion. Eight blades are spread over a 16” diameter to operate in moist soil conditions.

A Ball Nose End Mill, also called a “Ball Cutter”, “Ball End Mill”, or a “Ball Nose Mill” is an End Mill whose tip is ground in the shape of a half sphere. Ball End Mills are always center cutting, so they can cut everywhere on the ball.  We can think of them as a special case of corner radius endmills, where the corner radius is as big as it can be.

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They can be single end or double end. They can be made from solid carbide or high speed steel and are available with coatings. They’re available with a full selection of number of flutes, based on their intended material.

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As you can see, the change in quality is so dramatic that you might be tempted to always use the smallest stepover possible.

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The task of making accurately sized and good-quality finish holes requires specialty tools and proper technique.

Ballnoses create scallops whose size depends on the diameter of the ballnose, the depth of cut, and the stepover between successive passes:

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The ball nose has a weakness, which is that the closer you get to the tip, the slower the flutes are spinning. It sounds counter-intuitive, but just think of that tip as a series of concentric circles at different heights. The ones near the tip are smaller circles, their circumference is shorter, yet they’re spinning at exactly the same rpm as the bigger circles up higher. Hence, the tip moves slower. Conceptually, the exact tip isn’t really moving at all as it is a circle with zero radius.

Large diameter (16”) pipe is used to construct the smooth roller. Larger pipe rolls up and over uneven terrain to leave a smooth, consistent surface. Surface residue may be flattened without burying stalks.

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It takes some skill and intuition to use a Ballnose End Mill efficiently. We’ve got a great article by CAM software developer Robert Grzesek that walks you through how to do it:

Not only does this allow faster milling (higher feedrates are possible) but it gives a better surface finish and even improves tool life.

Bob is responsible for the development and implementation of the popular G-Wizard CNC Software.  Bob is also the founder of CNCCookbook, the largest CNC-related blog on the Internet.

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A moment spent looking at the image above illustrates a connection between scallop height and the stepover value- increase one and the other increases as well. In the images below we’ll use a stepover equal to 1/10, 1/5, and 1/3 of the tool diameter to show this correlation. To put real numbers on this, that would be equavalent to a .012, .025, and .042″ stepover for a .125″ ball mill.

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A special variant of Ball End Mills is the Tapered Ball End Mill. They’re designed with a taper along their length. This taper gives them better reach when machining angled profiles while maintaining more shank diameter (i.e. cross section) over most of the tool’s length. That cross section helps to minimize tool deflection, reduces the likelihood of chatter, and helps provide a smooth finish..

Four varieties of rollers create surface finishes to match your particular soil types and tillage practices. As a general rule, each finishing tool firms the soil surface, reduces hard surface clods and seals moisture. Finishing tools feature a simple ratchet screw jack depth adjustment and universal mounting system that attaches to most any size tillage frame.

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This observation leads to a clever technique called “Sturz Milling”. With this technique, you use the 4th axis to allow the ballnose to be presented to the workpiece at an angle, so the side of the ball is used more than the tip:

They can be used used for milling a large corner radius, grooving with a full radius, and contour or profile milling. The smaller diameters can be used for engraving. Their primary application is in 3D semi-finishing and finishing operations for industries like Mold & Dies.

The thing about a ball nose if if your cut depth is less than the radius of the ball, they your effective diameter varies from the shank diameter of the cutter. It will be smaller. Simple geometry will tell you what the size is.