Forstner Drill Bit

The absolute best source for sharpening this tool is Leonard Lee's book, The Complete Guide to Sharpening, Chapter 15. (This is a must-have for any sharpener's library.)

Other notes :

  • Rims
    • Ensure both rims are the same height.
    • Rims can be sharpened using a round or half-round file. I have also used a small sanding drum in a Dremel-style device when the drill bit was badly dulled.
    • Sharpen the inside of the bevel (nearest the point), and not the outside. Sharpening the outside would reduce the bit's overall diameter.

  • Chipping Bevels
    • Ensure both chipping bevels are the same height.
    • The chipping bevels should be at the same height as the rims. If there is a significant gap, the drill bit should be replaced.
    • Sharpen the throat of the bevel using a flat file, and not the other side. Sharpening the side opposite the throat would reduce the chipping bevel's height.

  • Point
    • Ensure the point extends beyond the rims by at least 0.005".

  • DO NOT change
    1. the center point of the drill bit, or
    2. the diameter of the drill bit.

  • Grind the minimum off the point.

Point Angle Chipping Bevel Rake Angle Notes

Notes & Comments

Information regarding Grindstones

Probably best to stay with the drill bit's geometry as supplied by the manufacturer.

If you have a Fine Wood Working membership, the are good instructions from Roland Johnson.

More Information

Books & Papers

Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the

About this site
Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at