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  • Marie Jay's Metal Products Co., Ltd

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Marie Jay's Metal Products Co., Ltd

Home > Video > Video Display > Drilling deep holes with annular cutters and magnetic drill

Drilling deep holes with annular cutters and magnetic drill

For step by step instructions on drilling deep holes, please visit:

Drilling holes in thin plates with annular cutters and magnetic drilling machine is an easy task, but when it comes to drilling holes in thick plates from 60 mm to 110 mm thickness the task becomes a little tricky.

As per the geometry of the annular cutters, the spiral chips comes out of the hole with the help of the flutes made on annular cutters. But, while drilling deep holes the chips do not easily come out complete which results in annular cutter not performing or getting stuck.

In this video, we would like to demonstrate and give tips on how to drill deep holes with annular cutters and magnetic drill?

We are using a 90 mm thick steel plate (3 35/64 inches).

We are drilling with 22 mm (55/64 inches) diameter X 110 mm (4 21/64 inches) length tungsten carbide tip annular cutter.


While drilling more than 70 or 80 mm (3 5/32 inches) deep holes with a magnetic drill and annular cutter, there is always an issue that the cutter after certain depth does not cut or penetrate the material.

This is because the chips from the material are not able to travel outside of the hole and thus creates a layer of powdered chips between the cutter teeth and the surface of half made hole. This layer of powdered chips does not allow the annular cutter to penetrate.


For drilling deep holes the best way to have air compressor along. Once you feel the cutter does not cut, give reverse feed to the cutter and blow air inside the holes to remove the powdered chips.

Also, blow air on the tips of the annular cutter and also around the flutes of the annular cutter to remove the powdered or spiral chips.

Then, start to drill again.

Repeat the process until you finish to make the hole.

With this process, you can easily make deep holes and also increase your tool life.


Use external as well as internal lubrication while drilling deep holes.

We would recommend not using an ejector pin or pilot pin after you reach 60 mm (2 23/64 inches) deep because sometimes the ejector pin is too long to go upside into the taper and may also prevent the annular cutter to cut.
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