What You Need to Know about Long Neck End Mills

Posted on Apr 15, 2021

Long neck end mills

A long neck end mill is a type of end mill that has a pointy top and a cylindrical undercut neck. The long neck end mills are highly accurate copper electrode machining with minimal burrs.

What Are Long Neck End Mills?

An end mill is a type of milling cutter, a cutting tool used in industrial milling applications. It is distinguished from the drill bit in its application, geometry, and manufacture. While a drill bit can only cut in the axial direction, most milling bits can cut in the radial direction. Not all mills can cut axially; those designed to cut axially are known as end mills. End mills in general are used in milling applications such as profile milling, tracer milling, face milling, and plunging.

A long neck end mill is a type of end mill that has a pointy top and a cylindrical undercut neck. The long neck end mills are highly accurate copper electrode machining with minimal burrs. The sharpness shearing ability and DLC coating of long neck end mill innovated high-quality copper electrode machining. In this article, we’ll review the specific type of end mill, the long neck end mill.

:: Read more: What Is an End Mill Cutter

Features of Long Neck End Mills

Some of the features of long neck end mills include:

● Long neck end mills are capable of machining a wide range of materials including copper, cast iron, carbon steel, tool steel, mold steel, die steel, stainless steel, plastic, acrylics, etc.

● Long neck end mills are ideal for machining micro parts where interference in rib grooving and processing time can cause issues.

● Long neck end mills typically adopt premium infinity coating to achieve longer life in the machining of materials with high hardness.

● As opposed to the standard end mills, long neck end mills enhance machining accuracy.

● Long neck end mills are perfect for resin processing, as well as deep grooving thanks to the undercut processing of the neck part.

● Long neck end mills are often DLC coated to ensure both sharpness and durability.

● Long neck end mills, just like all other types of end mills, can be made from a broad range of materials including general steel, quenched and tempered steel, high hardness steel, stainless steel, aluminum, copper, etc. 

:: Read more: What Are End Mill Tools?

Materials of Long Neck End Mill

As mentioned above, long neck end mills can be made of a wide variety of materials based on different applications and purposes. Here are some of the common materials used to make end mills:

● High-Speed Steel (HSS):

High-speed steel offers good wear resistance and costs less than cobalt or carbide end mills. It is typically used for general-purpose milling of both ferrous and nonferrous materials.

● Vanadium High-Speed Steel (HSSE):

Vanadium high-speed steel is made of high-speed steel, carbon, vanadium carbide, and other alloys designed to increase abrasive wear resistance and toughness. HSSE is normally used for general applications on stainless steel and high silicon aluminum.

● Cobalt:

Cobalt offers superb wear resistance, higher hot hardness, and toughness than high-speed steel (HSS). There is very little chipping or microchipping under severe cutting conditions, allowing the tool to run 10% faster than HSS, resulting in excellent metal removal rates and good finishes. It is a cost-effective material ideal for machining cast iron, steel, and titanium alloys.

● Powdered Metal (PM):

Powdered metal is tougher and more cost-efficient than solid carbide. It is tougher and less prone to breakage. PM performs well in materials < 30RC and is used in high-shock and high-stock applications such as rough.

● Solid Carbide:

Solid carbide offers better rigidity than high-speed steel (HSS). It is extremely resistant to heat and is used for high-speed applications on cast iron, nonferrous materials, plastics, and other tough-to-machine materials. 

● Carbide-Tips:

Carbide-tips are brazed to the cutting edge of steel tool bodies. They cut faster than high-speed steel and are typically used on ferrous and nonferrous materials including cast iron, steel, and steel alloys. Carbide-tipped tools are a cost-effective option for larger diameter tools.

● Polycrystalline Diamond (PCD):

PCD is a shock- and wear-resistant synthetic diamond that allows for cutting at high speeds on nonferrous materials, plastics, and extremely difficult-to-machine alloys.

Flute Types for Long Neck End Mills

Flutes are the easiest part of the end mill to recognize. These are the deep spiral grooves in the tool that allows for chip formation and evacuation. Simply put, flutes are the part of the anatomy that allows the end mill to cut on its edge.

There are essentially four types of flutes, and a long neck end mill can be accompanied by either one of the four types of flutes depending on the application. We’ll review each of them in the lines below:

● Single Flute:

Single flute designs are used for high-speed machining and high-volume material removal.

● Two Flute:

Two flute designs have the most amount of flute space and are also one of the most common flute types for long neck end mills. They allow for more chip carrying capacity and are used primarily in slotting and pocketing nonferrous materials.

● Three Flute:

Three designs have the same flute space as two flutes, but also have a larger cross-section for greater strength. They are used for pocketing and slotting ferrous and nonferrous materials.

● Four or Multiple Flute:

Four flute or multiple flute designs allow for faster feed rates, but due to the reduced flute space, chip removal may be a problem. They produce a much finer finish than two and three flute tools. Ideal for peripheral and finish milling. You will also find that this type of flute is being used frequently on long neck end mills.

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