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From a coefficient of friction table found here, it seems that cast iron on cast iron may fit the bill. The coefficient of static friction is 1.1, but the coefficient of kinetic friction is only 0.15 - it takes more than 7 times as much force to initiate movement between cast iron plates as it does it keep them moving at a constant speed. This is the highest ratio I could find between static and kinetic friction coefficients.
High-friction material is also available in smaller (1" and 2") pre-cut disks or larger sheets of material that can be cut to suit the application. Many shop jigs, such as bench hooks and shooting boards for example, are built to hold the workpiece in a stable position for working. However, unless these jigs are clamped to the bench, they often move around during use. This impacts precision and, most important, the safety of these jigs; nobody wants a saw hook sliding on them mid-stroke when cutting a piece. A few strategically placed circles or strips of the high-friction material locks the jig to the bench top, while still allowing it to be moved around easily.
Sharpening set-ups, such as stone or glass holders, can also benefit from added stability in use. The high-friction material is rubberized, which means it has some give, so it will confirm to shavings and material on the bench to ensure a stable and safe work platform. An added benefit of the high-friction rubber material is the sound-deadening, which helps keep the workshop a quieter place.
For more information, please visit NFJ.
Pick up four practice hockey pucks and an eight-pack of 2-3/4" Grip Discs to take your work-holding game to the next level.
Text and photos by Richard Wile
Richard Wile, Lee Valley staff member, is a woodworker from Nova Scotia who has built musical instruments and furniture from all genres. He has also taught and written about woodworking both locally and abroad. Follow him on Instagram: @rdwile
If you are looking for more details, kindly visit High Friction Materials.