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1. Mill Slot Cutter
2. Milling Machine Cutter Sets
3. Iscar Slot Milling Cutters
4. Indexable Slot Milling Cutters
5. Milling Machine Cutters Tools

Types of Milling Cutters Used in Machining Process

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• Slot Milling (169) Slot Side (169) Slot Square End. Insert Thickness S Insert Thickness W Insert Width. Cutting Edges per Insert.
• A bull nose cutter mills a slot with a corner radius, intermediate between an end mill and ball cutter; for example, it may be a 20 mm diameter cutter with a 2 mm radius corner. The silhouette is essentially a rectangle with its corners truncated (by either a chamfer or radius).

Are you curious to know about the types of the milling cutters? Well, this article will give you the information about all milling cutters. So, what are you waiting for? Let’s get started.

Let us start first by knowing what is milling? Milling is a cutting process where we use a cutter to remove the material from the surface of a metal or work piece. This cutter which we use has multiple rotating cutting surfaces. Milling cutters play an important role in the milling process and they are used in several milling machines. Milling cutters are of many sizes and shapes.

Following are the types of milling cutters that we use in different milling machines:

• Roughing end mill
• Slab mill
• End mill cutter
• Hollow mill
• Ball mill cutter
• Involute gear cutter
• Face mill cutter
• Wood ruff cutter
• Thread mill cutter
• Fly cutter
• Slide and face cutter
• Hobbing cutter
• Dovetail cutter

Some Cutters with Description

1. Roughing End Mill

This type of cutter is used when you have to remove more amount of material from the work piece. By using roughing end mills, we obtain a rough surface finishing. Roughing end mills are also famous as “rippa” cutters. They are more beneficial commercially and are used in various industrial applications.

2. Slab Mill

This type of cutter is used when you have to remove more amount of material from the work piece. By using roughing end mills, we obtain a rough surface finishing. Roughing end mills are also famous as “rippa” cutters. They are more beneficial commercially and are used in various industrial applications.

3. End mill

These types of milling cutters have the cutting teeth on the both sides. We use end mill more in the vertical milling processes. High speed steel or the cemented carbide are used to create end mills. High speed steel is also called as HS or HSS. The high speed steel doesn’t loose its hardness when the temperature increases. Hence, due to better hardness the high speed steel is used to make end mills. The end mills are mostly used in plunging, tracer milling, face milling, etc. Torus cutters, etc. are the different cutters which are involved in the term end mill.

4. Hollow Mill

They are also referred as hollow milling cutters. Hot hot slot machines pick a flame. They look like a pipe having thicker walls. You will find the cutting teeth of the hollow mills on the inside surfaces. Hollow milling cutters are used in the screw machines.

5. Ball Mill Cutter

Ball cutters are also famous as ball nosed cutters. You can be easily identify as ball cutters as their end is hemispherical in shape. Ball cutters are used to decrease the stress concentration and are also known as ball end mills. Whenever there is need of cutting three dimensional shapes then, there is a use of ball cutters to perfectly cut those three-dimensional shapes.

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Mill Slot Cutter

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Cutters for horizontal milling

The cutting tools that fit the horizontal arbor are in the form of circular disks with the cutting teeth round the outside edge.

This disk has a hole in its center that accurately locates it on the arbor. The spacers can be used to position the cutter at any position along the arbor. The arbor is then filled up with more spacers and these are then all clamped together by means of the special nut.

Only cutters that have the right size hole can be used on any particular arbor. Arbors can be either imperial or metric. But in the market for second hand cutters by far the most common size is 1 inch.

A key should be used for the cutter so it cannot rotate round on the arbor.

The key should fit the keyway on the cutter tightly.

It is also possible to have more than one cutter on the arbor. These can be spaced apart or they can be placed so they are adjacent to each other. Spacers are made specially to do this.

It is possible to make cutters for the horizontal arbor that are similar to fly cutters. In that they have only one cutting edge. This is useful where a cutting edge of a particular form has to be improvised, for example, a cutter for cutting gear teeth.

One important difference between using vertical cutters and horizontal cutters is that with vertical cutters the forces applied to the workpiece can vary in direction all the time. Very often this means that the maximum cutting force that can be used is limited to the force that can be used in the worst case. Consider where the workpiece is held in a vice. A force against a jaw can be very large whereas a force pushing the workpiece sideways will have to be much less.

With horizontal cutters the direction of the force is usually simple and obvious. So long as the system being used to hold the workpiece is adequate in the direction of this force any other forces are not a problem.

Horizontal cutters – symmetry

With all horizontal type cutters it is often the case that the cutter is symmetrical. It will only cut one way round but if put on the arbor the other way round it can cut if rotated in reverse. Furthermore it will cut the same shape either way round.

Some cutters are not symmetrical. They will run in reverse but the shape cut will be reversed. The fig. shows two cutters both of which are flat on one side but cut a 30° shape on the other. The one on the right is said to be right handed.

Horizontal cutters – Slitting saws

One common cutter is the slitting saw. This will cut a slot the same width as the cutter. The usefulness of this is that a slot of only a few hundredths thickness can be cut. This is not only far narrower than could possibly be cut with an endmill but it has a much better finish. But, of course, the slot cut this way cannot have a vertical end. Usually, but not always, a cut like this will go straight through the workpiece from one side to the other. One exception is when it is used for making graduations.

These thin cutters only cut true when they are cutting with metal on both sides of the cutter. Where a slitting saw is used to clean up an edge of a sheet or of a block the force pushing the saw aside is related to the depth of cut and the width of the cutter. For example a 2mm cutter will not cut a sheet of aluminium 12mm thick unless there is at least 5-10mm on the waste side. But the same cutter will cut the same sheet with 5mm waste if each pass of the cutter is only 2mm deep.

If several slitting saws are spaced apart on a stub arbor for example to cut the fins on a cylinder head, if the fins are too thin they will warp very slightly, the saws will get stuck and will break.

It follows from this that it is not possible to cut a slit, say, 1mm wide and then increase the width by milling another slot next to it. In practice, with thin slitting saws slot have to be cut with the width of cutter needed.

Slitting saws usually come in standard metric or imperial sizes. Odd sizes are made for special purposes. One example of this is for making the slots in the heads of screws.

Thin slitting saws are often of limited diameter, about 100mm.

Large but thin slitting saws are sometimes used with keeper plates to make them more rigid and so produce a straight slot where otherwise they would drift off course.

As slitting saws get thinner and thinner they tend to get smaller and smaller. As they get smaller the hole in the middle gets smaller and becomes too small to use with the standard horizontal arbor.

They can be used on a large machine by using a small arbour with a ½ inch parallel shank. This can be held in a collet chuck (but not an Autolock one). This particular type is made so a cutter with a bore of ½ , 5/8, ¾ or 7/8inches can be used.

Graduating with a slitting saw – 647

Broken slitting saws

When a slitting saw is broken it is often worth saving the bigger bits. These can be used as material for making other cutting tools. They can be made into cutters for graduating. Larger pieces can be made into parting tools.

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Use of larger diameter horizontal cutters

Often when using the mill in the horizontal mode it will be found that cutters of the usual 100mm diameter will mean that the arbor will often clash with any clamps that are used to hold the workpiece. It is often useful to have a few cutters of a larger diameter.

Similarly when using horizontal type cutters on a stub arbor in vertical mode a very wide cutter will cut a workpiece without it hitting the vertical head.

Thicker cutters can easily be up to 200mm diameter. This is useful when held on an arbor in the vertical head because the cutting edge can clear the vertical head.

Side and face cutters

Wider cutters are known as side and face cutters. They have cutting edges both on the circumference of the cutter and on its sides.

These are much more rigid than slitting saws and a cut can be widened by making a second cut next to the first.

Where the width of the teeth is wider than the depth of the hole in the middle these cannot be fitted next to each other on an arbor.

Milling Machine Cutter Sets

These are a challenge when it comes to sharpening. But is it the front of the tooth that does most of the work and this is not difficult to sharpen.

Slab cutters

Very wide cutters are known as a slab mills. These only cut on the circumference – not on the sides. On the other hand they are usually of limited diameter. They are not designed to cut slots but to cut large, flat surfaces.

These can be used with a side and face cutter at either end so as to cut three sides of a block in one go.

Slab cutters always have helical teeth so as to give a smoother cutting action. This invariably produces end thrust when cutting. Ideally if there is more than one wide cutter like this the helices should alternate so as to cancel each other out as much as possible. If after this there is still a significant end trust then it should be towards the spindle.

Form cutters

Any cutter whose cutting edge is shaped to cut the same shape or form on a workpiece is a “form” cutter. The most interesting type of form cutter is the gear cutter but many other types exist.

Gear cutters

A cutter with the right shape teeth can be used to cut gear wheels. Much more on this later.

Iscar Slot Milling Cutters

Other form cutters

Cutters also exist that can cut round edges either concave or convex.

Whereas with a radius cutter designed for in the vertical mode it is only possible to cut a convex 90° sector. It is possible with a horizontal cutter of the right shape to cut a convex or concave 180° sector.

Generally, this cutter cannot cut a 90° arc. This needs a different cutter.

Cutters also exist that will either single or double edges at common angles such as 22.5º, 30º, 45º and 60º. Since any of these cutters can only cut one way round if the section is not symmetrical then it is possible for both a left handed and a right handed version to exist.

It is possible to use a non-symmetrical cutter the “wrong” way round if it possible to run the milling machine spindle in reverse.

Since the original incentive for the invention of the milling machine was to cut the flutes in twist drills there is a whole range of cutters shaped to cut such flutes.

In the same way as a fly cutter can be used in a vertical mode it is also possible to have a fly cutter in the horizontal mode. The merit of this is that where a complicated shape needs to be machined, for example a gear tooth, if a cutter cannot be obtained it is much easier to shape one cutting edge on a fly cutter than on a proper cutter which would have many teeth.

Cutting other angles

Indexable Slot Milling Cutters

On a horizontal milling machine the angle of the cutter to the milling table is fixed. It is possible to use horizontal cutters another so other angles can be made from them.

Milling Machine Cutters Tools

One way of doing this is to fit the horizontal arbor into the vertical socket when it is in the horizontal position. Usually this might be done with this arbor horizontal. But, suppose it is necessary to cut a 46º and 46º groove. This could be cut with a 45º and 45º cutter. The cut would be made twice. The first time the arbor would be turned by 1º one way. The second time the arbor would be turned by 1º the other way.