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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

Slot Drill

A milling cutter that can be used to plunge into the material and then moved to cut a slot.

End mills do not tend to have a clearance cutting edge on the end and so are not great to use in a plunge type of cutting ie like a drill or slot drill.

On the left is a 2-flute slot drill and on the right a 4-flute end mill.

The end mill is used by moving the mill into the material sideways, ie at right angles to the axis of rotation.


Slot drills are available in a number of different sizes, materials and tend to be available as 2 or 3 flute designs.

2 Flutes

These are better for plunging into material as the centre will cut and remove material. 3 and 4 flute slot and end mills do not cut as well at the centre and so will not cut if you plunge them into the material.

3 Flutes


See also: End Mill, Mill.



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