Tungsten Carbide Forstner Bits Ⅶ
- Details
- Category: Tungsten Information
- Published on Wednesday, 25 November 2015 13:42
In last part we know that tungsten carbide Forstner bits can only be used in a drill press, cannot remove chips automatically, are relative more expensive and difficult to sharpen. In this part we explain how to sharpen a Forstner bit.
Some woods, such as cedar, contain silicates that can gradually dull, albeit slower, the tungsten carbide Forstner bits. To sharpen a Forstner bit, we can follow the below steps:
1. Choose your file, round for rims.
For bits with a cutting rim, chuck a round file in your drill press. At the drill's lowest speed, lightly hone the interior of the rim taking care to match the angle of the interior of the rim to the file as you turn the bit through a few quick strokes.
3. Choose your file, triangle for teeth.
If your Forstner bits have serrated teeth on the cutting rim, skip the round file and instead clamp the bit in a vise and hone the back of each tooth with a triangular file. Don't overdo it; a few strokes per tooth will suffice.
4. File the flats.
Next, with the bit clamped in a vise, hone the leading edge of the chippers with a fine mini-hone, ensuring a flat plane and sharp cutting edge. Pay close attention to the intersection where the chipper meets the cutting rim. A crisp corner makes clean cuts.
5.Keep the center spur centered.
Finally, use the triangular file to hone the center spur. Use your thumb as a guide to protect the chippers and rim. Don't overdo it here: Use the same number of light strokes on each face to keep the point of the spur centered.
(The End--This article is divided into several parts. Here is part 7. For part 6 please refer to http://news.chinatungsten.com/en/tungsten-information/80739-ti-10469)
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