Flat stones are essential to good sharpening. The Dia-Flat from Diamond Machining Technology (DMT) is certified flat to within .0005″ and makes quick work of flattening waterstones or oilstones.
I tried it out on a well-used Shapton ceramic stone, and was finished in about two minutes! (That’s pretty impressive, as Shapton stones are so hard that flattening them with sandpaper is impractical.) In fact, I had so much fun that I flattened every stone in my shop.
According to DMT, their Diamond Hardcoat Technology—utilizing precisely-sized micron mono-crystalline diamond—outlasts any other diamond-coated lapping plate. It’s 120 micron (roughly equivalent to 120 grit sandpaper) and can be used on any stone, from coarse to fine. The Dia-Flat’s generous size is another plus. The plate is 4-1/2″ wide by 10″ long, which is plenty large to flatten any stone. For the quickest results, use it under running water or in a tub of water. If you’re flattening oilstones, use oil instead of water.
Here are some supplies and tools we find essential in our everyday work around the shop. We may receive a commission from sales referred by our links; however, we have carefully selected these products for their usefulness and quality.