Skew Chisel

Closed Seat on SVS-50

Guidelines shown below are for use with the Tormek SVS-50 Multi Jig using the Closed Seat. The method for measuring the projection is shown below.


There is a separate page in this handbook for Lacer-style Skew Chisels.

General Guidelines
Edge Angle Skew Angle Profile Tormek
SVS-50
Comments
α α Range γ γ Range α JS P Hole
30° 25° - 55° 20° 20° - 35° Straight Edge
30° 20° 65 mm B For tight spots, detail work and finest finish.
45° 20° 55 mm B For broad application. Considered easier to control than a 30° edge angle.
30° 25° - 55° n/a Radius Edge
30° 30° 75 mm B For tight spots, detail work and finest finish.
45° 20° 65 mm B For broad application. Considered easier to control than a 30° edge angle.

Notes & Comments

This tool is one where reshaping the cutting surface can be onerous, and the Tormek BGM-100 Bench Grinding Mounting Set can be quite useful. When grinding on a high speed grinder, all the settings remain the same. (For more information on Shaping vs. Sharpening, see also, Grindstones and Other Sharpening Media.)


Allan Batty stated that you can have an α up to 55° for hardwoods, and down to 25° for softwoods, but he usually worked with an α up to 40°. (A video guide, featuring Allan Batty, on using the skew is at the bottom of this page.)

Another rule often cited is that the length of the bevel should be 1.5 - 2 x the thickness of the skew (equates to 30° - 39°).


Alan Lacer wrote an article for the AAW titled "Learn to Sharpen Your Turning Tools" where he recommended 20° for the skew angle (γ).


Mike Darlow wrote an article for the AAW titled "Virtues of a Skew-Cut V-Groove" where he recommended 25° for the edge angle (α) and 20° for the skew angle (γ).


If grinding this on a high speed grinder or sander, be sure to manage the temperature so that the temper is not lost due to overheating.

Information regarding Grindstones

High Carbon Steel Temperature control is critical for high carbon steel. Tempering will be lost in the steel if heated until it is blue (~550°F / 300°C). Cool by dipping as needed in water.

High Speed Steel

Cool by dipping as needed in water.

Steel with Carbide Insert DO NOT cool by dipping in water. This will cause the carbide to crack due to shocks.

It is also recommended to use a high grit wheel for sharpening carbide as lower grits can cause cracks in the edge leading to it being far more crack-ridden and brittle. (Lower grits can be used for shaping the edge -- see also, Grindstones and Other Sharpening Media - Quick Selection Guide.)


Some information presented is from the Tormek handbook, Water Cooled Sharpening of Edge Tools, ©Tormek AB.


More Information

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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 www.Tormek.com.


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 SharpeningHandbook@Gmail.com.