Dieter Schmid's Fine Tools
Diamond Sharpening Stones

Atoma diamond sharpening stones

If one takes into account their strengths and weaknesses, diamond sharpening stones are a real alternative to wet grinding wheels and sharpening stones. Sooner or later all conventional sharpening stones become hollow with use, while diamond stones remain flat. You cannot flatten the back of a chisel or plane blade on a grinding wheel, but a diamond stone is ideal for the job. They are also ideal for removing large amounts of material, such as grinding out a notched edge. But sharpening stones are much better for honing an edge, because diamond stones cannot be made with a fine enough grit for a really good edge.

Never use diamond stones dry. First, this is bad for the surface of the diamond stone, and second, sharpening performance will be poor. Wet the sharpening surface every time before use! You should also avoid too much pressure on the surface when sharpening, and keep strictly away from the edges of the plate, as this can deform the plate and scrape off the diamond coating. More...

We are very happy to offer these Atoma branded diamond sharpening stones from the Japanese manufacturer Tsuboman. The manufacturer is known for high-quality and technically refined products – very important with this kind of product, as the quality and durability of the different diamond stones on the market varies widely. They are solid, without the large holes in the plate one often finds elsewhere, which can catch on smaller blades and do a lot of damage to the edge. Their surfaces are in general well made, flat with evenly distributed and precisely graded diamond chips. The chips themselves are exclusively monocrystalline diamonds, which are much more expensive than polycrystalline ones, but far more durable. They are fused to the plate using an electrolytic process.

Atoma Economy diamond sharpening plates

Often the label "economy" makes one suspicious that the manufacturer may have skimped on the quality of the materials he used for his tools. That is not the case here. Instead it has to do with the manufacturing process. Originally thick aluminum or steel plates were coated with diamond chips. This is expensive and the plates were very sensitive to mishandling. Tsuboman therefore decided to make the plates in this product line out of 1 mm thick stainless steel coated with diamonds and then used a double-sided adhesive tape to fix the plate to a 10 mm thick flat-machined aluminum plate. This product is relatively easy to manufacture, and when the diamond plate is worn out, you only have to buy a new one and glue it to the re-useable baseplate. It also makes for a lighter stone, 600 grams rather than 1000 grams of the original solid steel plate, a real weight saving. This method also makes for an unusually flat surface compared with other similarly priced stones. We placed a number of these plates on a certified flat granite measuring stone, and a 0.04 mm feeler gauge would not fit under the sharpening plate. We cannot guarantee this level of flatness for every Atoma plate we sell, but we can say that they are in general astonishingly flat.

Sharpening surface 210 x 75 mm
Total thickness 11.4 mm

Atoma diamond sharpening plate, coarse, 140 grit
Code 321200CartPrice € 85.00

Atoma diamond sharpening plate, medium, 400 grit
Code 321202CartPrice € 77.00

Atoma diamond sharpening plate, fine, 600 grit
Code 321204CartPrice € 77.00

Atoma diamond sharpening plate, extra fine, 1200 grit
Code 321206CartPrice € 77.00
Atoma Economy replacement diamond sharpening plates

These are made to replace the cutting surfaces of the Atoma diamond sharpening plates described above. But they can also be glued down to other backing plates of your choice. The backs are covered with strips of double-sided adhesive tape and gluing them down is quick and easy. The plates are made of 1 mm thick stainless steel; with the tape the total thickness is 1.4 mm. Because the plates are so thin, you must take care when fixing them to a backing material; the quality of the result depends a great deal on the flatness and stiffness of the backing plate you choose!

Sharpening surface 210 x 75 mm

Replacement diamond sharpening plate, coarse, 140 grit
Code 321201CartPrice € 69.00

Replacement diamond sharpening plate, medium, 400 grit
Code 321203CartPrice € 60.00

Replacement diamond sharpening plate, fine, 600 grit
Code 321205CartPrice € 60.00

Replacement diamond sharpening plate, extra fine, 1200 grit
Code 321207CartPrice € 60.00
Atoma sheets for diamond sharpening plates

These are very flexible, self-adhesive plates made of a copper foil coated with diamond chips. The total thickness is only 0.5 mm. They can be glued to surfaces of almost any shape, and can also be cut, with suitable scissors, to any shape you desire. They are useful for many different types of metal work. If they are used to sharpen tools, like chisels or knives, you must be careful not to pierce the relatively fragile copper foil and damage the surface. Do not sharpen in the direction of the cutting edge or other sharp corners. The diamond coated foil comes in grit grades of 140 (coarse), 200 (semi-coarse), 400 (medium), 600 (fine), and 1200 (extra fine).

Note: We do not hold large quantities of foil plates in stock!

Grit grade Dimensions in mm CodePrice
140 10 x 100
Code 321220CartPrice € 17.00
200 10 x 100
Code 321221CartPrice € 17.00
400 10 x 100
Code 321222CartPrice € 17.00
600 10 x 100
Code 321223CartPrice € 17.00
1200 10 x 100 Currently not in stock!
Code 321224Cart Price € 17.00
140 50 x 100
Code 321230CartPrice € 39.00
200 50 x 100
Code 321231CartPrice € 39.00
400 50 x 100
Code 321232CartPrice € 39.00
600 50 x 100
Code 321233CartPrice € 39.00
1200 50 x 100
Code 321234CartPrice € 39.00
140 100 x 100
Code 321240CartPrice € 72.00
200 100 x 100
Code 321241CartPrice € 72.00
400 100 x 100
Code 321242CartPrice € 72.00
600 100 x 100
Code 321243CartPrice € 72.00
1200 100 x 100
Code 321244CartPrice € 72.00
140 100 x 200
Code 321250CartPrice € 129.00
200 100 x 200
Code 321251CartPrice € 129.00
400 100 x 200
Code 321252CartPrice € 129.00
600 100 x 200
Code 321253CartPrice € 129.00
1200 100 x 200
Code 321254CartPrice € 129.00
140 200 x 200
Code 321260CartPrice € 199.00
200 200 x 200
Code 321261CartPrice € 199.00
400 200 x 200
Code 321262CartPrice € 199.00
600 200 x 200
Code 321263CartPrice € 199.00
1200 200 x 200
Code 321264CartPrice € 199.00
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