|Review by Dan||posted 682 days ago||3548 views||3 times favorited||13 comments|
For the past couple years I have been sharpening my tools using the Scary Sharp method. To grind a new bevel on a plane iron or chisel I would use a grit anywhere from 80-120 grit sheets. The paper cuts fast but it also wears fast. Another problem with the paper is it clogged up quickly. With all the irons that I sharpen I was just going through a ton of paper so I started looking into coarse diamond stones.
DMT sell two different types of bench stones. They have the DiaSharp which are a single grit stone and they have the DuoSharp which are a combination of two grits. The DuoSharp also have the holes all over to help prevent clogging. I spent a lot of time researching both types of DMT stone and I ultimately decided to go with the DuoSharp Coarse/Extra Coarse 10” stone.
This stone was not cheap, the price tag on it through Woodcraft is 124.00 but its a big stone, much larger then a standard sharpening stone and you also get two different grits.
To test it out I decided to use my thickest A2 steel iron which is my Pinnacle/Cossman iron. The A2 irons I have are really tough to grind using sandpaper. The A2 wears the paper out twice as fast as my O1 irons so I was curious to find out how the DMT stone would work on them. Using the coarse side of the stone I was able to shape a new primary bevel on the Pinnacle iron in less then 10 min. I also tend to work a little slow when sharpening so I bet it could be done even quicker.
The 2 big advantages that I found with the DMT stone vs Sandpaper are-
1. The stone does not wear like the paper does. While a fresh sheet of 80 grit paper will cut extremely fast for the first few passes, it will dull very quick, especially when using it on A2 steel. Previously I would wear out a full sheet of sandpaper each time I had to shape a new bevel.
2. The DMT stone did not clog at all during the whole time that I was grinding a new bevel. A few sprays of water was all that was needed before I started. With the sandpaper it would start to clog after the first few strokes so I would often have to stop to clean the paper off.
The DMT Coarse grit does not cut super fast but considering it does not wear or clog I think it takes less time over all to put a new bevel on an iron or chisel then it does with the paper.
I have also used the coarse side to flatten my Shapton glass stones and it works great for that.
-- Dan - "Collector of Hand Planes"