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Up Milling and Down Milling-Differences, Working, Advantages, Application

Up Milling and Down Milling:

Are you looking for the Up Milling and Down Milling? So today we will study in details the Definition, Working principle, Advantages and Disadvantages, and Differences between Up Milling and Down Milling Machine. 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.

Milling Machine:

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

MILLING MACHINE

  • 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.

Up Milling:

  • The up milling is also called as conventional milling or Climb up milling.
  • In which the cutter and feed moves in 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.

Advantages of Up Milling:

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

Application: 

  • The up milling is generally used for milling of casting and forging.

Down Milling:

  • The down milling is also called as Climb down milling.
  • In case of down milling, the cutter rotates in the same direction as that of the feed.
  • In down milling, 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.

Advantages of Down Milling:

  • This machine poses a longer tool life.
  • This machine produces a good surface finish.

Application: 

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

Difference between Up Milling and Down Milling Machine:

Sl.No Up Milling Down Milling
1. This machine is also called as conventional milling or climb up milling. Down milling is also called a climb down milling.
2. The cutting forces act upward. The cutting forces act downward.
3. Up milling is mostly used for rough cutting operations. Down milling is used for finishing operations.
4. Due to more tool wear rate, their durability of the tool is less. Due to less tool wear rate, their 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, down milling is a better operation choice then up milling machine.
7. Effective cooling is not required during cutting action. Effective cooling is possible during cutting action.
8. Cutter rotates against the direction of travel of the workpiece during metal cutting. 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. For down milling, 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.

Today we have learned in details about Definition, working principle, Advantages and Disadvantages, and Differences between Up Milling and Down Milling Machine. If I have missed something, kindly inform me through commenting. If you like this article, don’t forget to share it on social networks. Subscribe our website for more informative articles. Thanks for reading it. Thank you.

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One Reply to “Up Milling and Down Milling-Differences, Working, Advantages, Application

  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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