Start by thoroughly cleaning the bit to remove any built-up pitch or other debris. A cut off disc used for the flat areas and a cone shaped stone for the rounded area see picture.
Are your bits losing their edge.
How to sharpen a forstner bit. Give one half-rim several strokes then give the other half-rim the same number. Youd never bore through sandpaper as we did to quickly dull the bits. Mar 28 2020 Perfect for any forstner bit including carbide-tipped and multi-spurbits it includes a 600 grit diamond honing stone 600 grit triangular diamond file a CeramCut honing stone and complete sharpening instructions.
Next is to sharpen the chippers in the centre. Phil Huber Nothing beats a Forstner bit for drilling clean flat-bottomed holes unless the bit is dull. One alternative is to send them out for sharpening but that can put them out of commission for a week or two.
Sharpen the chippers fount at the center of the Forstner drill using the triangular file on a flat surface because the chippers are always at an angle. We dulled our bits first. That makes it not only time efficient but also useful for any inserted part that needs flat bottom like round inlays.
With a set of simple diamond paddles you can get your bits back into shape in no time and quickly get back to your boring. Remember to keep the file away from all areas that you have filed. Filing according to the shape of the bit will make it easier to avoid sharp edges.
Start sharpening on the bevels on the inside of the bits rims. Dec 19 2019 Sharpening Forstner Bits By. Many people love the fortsner bit Adam Savage from Mythbusters is an outspoken fan of them but they have one drawback.
Rather than giving them the heave-ho try the ol. Then stroke the bit in an upward motion. Nov 14 2014 A forstner bit is an excellent woodworking drill bit that clears out a lot of materials quickly and leaves a hole with an flat bottom.
All you need is a small file and a slip stone. It is also critical that you never hone or file the outside of the rim which would lessen the bits diameter or the beveled side of the chippers which could change their cutting angle. Sharpening a forstner bit isnt difficult.
To sharpen I use a rotary tool such as a Dremel or pictured is a black and Decker one. The important thing is remove the same amount of material from each surface so the bit still works as. These angle up and all you need to do is rest the triangular file on this flat area and stroke upwards.
Its important to evenly sharpen the edge along its entire length and try to remove the same amount from both sides. It takes only a few strokes to get a sharp edge so dont overdo it. It also works to.
May 16 2016 How to sharpen Forstner bits Expensive bits are worth saving. Power Tools – Forstner bits have a lot of uses in your shop but when they get dull they are frus. This can be done by counting cutting strokes with the file.
George Vondriska shows his technique for sharpening forstner bits using a rotary tool to keep them sharp. The traditional tool for sharpening bits is a type of file although with Forstners a round slipstone was often a necessary addition to tackle the bevel on the curved rim. Bring the bit to your spinning stone and rotate it through a light smooth stroke along the entire length of one bevel maintaining the angle ground at the factory.
These days in place of a round slipstone many use a conical burr chucked in a pillar drill. Nov 01 2009 A. Forstner bits have a lot of uses in your workshop but when they get dull they are frustrating to work with.