How to Cut an MDF 45-Degree Angle

Written by heather montgomery
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MDF stands for medium density fiberboard. It is made from wood fibres which are compressed to make a smooth finish. MDF is often used for cabinets and other furniture. To make professional-looking furniture, using mitre cuts to join two edges is key. Mitring involves cutting two pieces so each has a 45-degree angle on the end; when the pieces are placed together, they make a 90-degree joint. Cutting the MDF to a 45-degree angle requires attention to detail and a saw capable of making angle cuts.

Skill level:

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Things you need

  • Measuring tape
  • Pencil
  • MDF
  • Table saw or mitre saw

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  1. 1

    Mark the measurement you want to cut onto the MDF.

  2. 2

    Set your table saw or compound mitre saw blade to 45 degrees.

  3. 3

    Place the bottom edge of the MDF closest to the blade. Turn on the saw. Push the MDF through the blade of a table saw, or pull the mitre saw's blade down onto the MDF.

Tips and warnings

  • A compound mitre saw is best for narrow pieces of MDF; you will not be able to cut a piece of MDF wider than your blade.
  • Place your hand on either side of the mark you want to cut when using a table saw. Keep your hands at least 4 inches from the mark on either side to protect them from the blade.
  • Use proper precautions when using any power tool.

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