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Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Parting Tool

A thin blade used to cut parts off. Also used for making grooves such as in pistons for rings to sit.

Parting tools are normally just a couple of mm wide. The blade itself is deep to give it strength.

When parting there is nowhere for the swarf to go and so there is a tendency for parting tools to jam.


A parting tool in use in a lathe.

In this case being used to make grooves for cooling fins.

There are a number of key parameters to remember when using parting tools:

  1. height is exactly on centre
  2. cutting angle = 35 for aluminium
  3. ensure the holder is tight with just enough overhang to make the cut
  4. use plenty of cutting fluid
  5. Lock the saddle
  6. Low speed - 150rpm or less
  7. Use parting blades that are at least 12mm deep
  8. Check alignment, then check again
  9. Hone the tool on a diamond abrasive

Here making grroves in a piece of 40mm diameter mild steel bar.

The chattering was quite bad initially, then I reduced the overhang of the tool in the holder to the bare minimum.


I also reduced the overhang of the tool in the toolpost.

Worth remembering that the workpiece needs to be as close to the jaws of the chuck as possible, once again to increase the stiffness of the lathe.


See also: Lathe Tools.

Model Engineering Glossary: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z