UP MILLING

Up Milling and Down Milling-Definition, Differences Between, Working, PDF

Amrit Kumar Manufacturing Technology 5 Comments

Are you looking for the Up and Down Milling? So today we will study in details the Definition, Differences, Working, Advantages, Application, PDF. Here you will get the articles of Mechanical Engineering in brief with some key points and you will get to know an enormous amount of knowledge from it. So If you find this articles helpful, please let us know in the comment box, either if any correction required too, also let us know in the comment box.

Up Milling and Down Milling:

Let’s first understand the Milling Machine which I also written separate articles just check out. I will drop the link below.

Definition:

This machine perhaps most widely used in manufacturing industries after the lathe machine

However, In the case of lathe machine, the tools used there single point cutting tool but In the case of the milling machine, the tools used are multi-point cutting tools.

The milling is a process of metal-removing by feeding the work past a rotating multipoint cutter. The diagram is shown below:

This machine can hold one or more, number of cutters at a time and rotates at high speed to remove the metal at a faster rate.

The metal removal rate is faster as compared to a lathe machine.

This machine is used to make gears like Spur gears, and also drill the workpiece bore, and produce slots.

Looking for some other topics explanation? I have discussed in details:

Parts and its brief details:

Base:

It is the foundation part of a milling machine and all other parts are joined on it.

It carries the entire load so it should have high compressive strength and it is made up of cast iron.

Column:

It is mounted vertically on the base.

It supports the knee, table, etc. Work as housing for all the other driving member.

it is a hollow member which contains driving gears and sometimes motor for the spindle and the table.

Knee:

It is a casting that supports the saddle and table.

All gearing mechanism is enclosed within the knee.

It is fastened to the column by dovetail ways.

The knee is supported and adjusted by a vertical positioning screw (elevating screw).

The elevating screw is used to adjust the knee up and down by raising or lowering the lever either with the help of hand or power feed.

Saddle:

It is placed between the table and the knee, and work as an intermediate part between them.

Can moves transversally to the column face.

Slides over the guideways provided situated on the knee which is perpendicular to the column face.

The main function is to provide motion in a horizontal direction to the workpiece.

It is also made by cast iron.

Continue readings on Milling Machine

Up Milling Definition:

This is also called as conventional milling or Climb up milling.

In which the cutter and feed moves in the opposite direction i.e the rotary cutter moves against the feed.

up milling and down milling

With reference to the adjacent figure, the cutter rotates in the anti-clockwise direction, while the direction of feed is from right to left.

So, due to this opposite motion, the width of the cutting chips gradually increases from minimum to maximum.

There is massive friction between the cutter and workpiece which results in generating a large amount of heat.

Up Milling Advantages:

This is a safe operation because It has no tendency to drag the workpiece into the cutter.

Up Milling Application: 

Generally used for milling of casting and forging.

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Down Milling Definition:

This is also called a Climb down milling.

In case of this milling, the cutter rotates in the same direction as that of the feed.

There is less friction involved between the cutter and the workpiece as both.

up milling and down milling

Therefore, the cutter and feed are moving in the same direction. This small amount of friction results in the generation of minimum heat.

Here, the thickness of the chip varies from a maximum to minimum during the process.

Down Milling Advantages:

This machine poses a longer tool life.

This machine produces a good surface finish.

Down Milling Application: 

This type of machine generally used for finishing the operation like sawing, grooving, keyway cutting, etc.

Difference Between Up and Down Milling Machine:

Sl. NoUp MillingDown Milling
1.This machine is also called as conventional milling.This is called a climb down milling.
2.The cutting forces act upward.The cutting forces act downward.
3. Mostly used for rough cutting operations.This is used for finishing operations.
4.Due to more tool wear rate, the durability of the tool is less.Due to less tool wear rate, the durability of the tool is more.
5.Tool wear rate is more, as the direction of the rotary cutter is against the feed.Tool wear rate is less, as the direction of a cutter is the same direction as the feed.
6.This process is mostly used in the conventional way of cutting the surface.Nowadays, This is a better operation choice then up milling machine.

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The most valuable and trusted Mechanical Objective book by R S Khurmi 5000+ Objective.

7.Effective cooling is not required during cutting action.Effective cooling is possible during cutting action.
8.The cutter rotates against the direction of travel of the workpiece during metal cutting.The cutter rotates in the same direction of travel of the workpiece during metal cutting.
9.Poor surface finish.Good surface finish.
10.It requires a large amount of force compared to down milling.Here, there is a requirement of less force.
11.This machine is mostly used cutting of brass, bronze, and ferrous materials.And whereas this is applicable to aluminum and aluminum alloys.
12.Chip thickness starts at zero and increases towards the end of the cut.Chip thickness is maximum initially and reduces to zero at the end of the cut.

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About the Author

Amrit Kumar

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Amrit is a Co-founder of Learn Mechanical Portal (Previously owned "Engramritkumar.com"). He completed his diploma in Mechanical Engineering from Acharya Polytechnic Bangalore and also completed his B-Tech from Delhi. Amrit is now preparing for Govt. exams. If you need help, you can ask him regarding any suggestions in the mechanical engineering field. He loves to meet new people.

Comments 5

  1. Thanks for helping me understand that this machine is to remove the metal at a fast rate. I just got curious about how this works since my brother will be buying one. It appears that he will be using it for personal projects that he plans to sell online in the future. He has always been a tinker ever since we were kids. He even made his own kite back then without any help.

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