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- Nov 25, 1999
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<center><font size=4>DMT sharpeners.</font></center>
<center><small>Patr 1 of 2</small></center>
The questions about different sharpening devices sometimes are asked here and on General Discussion Forum, so I decided to share my experience on sharpening equipment I have tried and/or I'm currently using.
First in this series let be DMT sharpening surfaces. It is well known that diamond is king of cutting. This is the hardest known material in the world, no one natural or man made material can beat it in hardness and as result - in cutting abilities. So it is a good idea to use diamond as abrasive material to obtain controlled steel removing from cutting edges what we usually call sharpening.
Construction. Diamond Machining Technologies (DMT) sharpening surfaces are created embedding diamond powder with strictly calibrated grain size onto steel surface using electrolyte nickel.
<small>Please click thumbnails to open enlarged image in separate window</small>
<a href="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25171900&Sequence=0" target="_blank"><IMG align=right SRC="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25171901&Sequence=0" border="3"></a>Most of DMT sharpeners (but not all) have diamond particles embedded onto steel surface perforated with round holes about 3 mm in diameter. These holes are filled wit plastic which makes up the sturdy base under relatively thin (about 1 mm) steel plate. This way steel plate is connected to plastic base near indestructibly, I can't imagine situation when it could be torn off. The interrupted sharpening surface have some advantages: first of all it allows to save some diamond powder what allows to reduce production costs and as result - price. Another advantage - interrupted surface is less prone to clogging - is not so important because diamond sharpening surfaces are in their nature much less prone to clogging than ceramic or natural counterparts. All things in this world have two sides, the disadvantage of interrupted surface appears when you have to sharpen very small blade or blade with very sharp pointy tip. For such occasions DMT makes some their sharpeners in Machinist version with some deal of continuos surface.
Grits. All DMT sharpening surfaces are divided to four groups depending on grit. Each group is marked in different color.
X-Coarse surfaces are marked with black color. Diamond particles size 60 microns makes grit 220. This kind of abrasive provides very fast and efficient steel removing what allows to restore heavily damaged edges or to reprofile the edge with minimal effort.
<a href="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25171902&Sequence=0" target="_blank"><IMG align=right SRC="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25171903&Sequence=0" border="3"></a>Coarse surfaces are marked with blue color. Particles have size 45 microns (grit 325) what provides efficient cutting to restore very dull or lightly damaged edges. If only light edge reprofiling is required this surface is quite enough.
Fine surface are marked with red color. Particles with 25 microns (grit 600) leave very sharp working edge which matches both heavy and precise cutting tasks. This surface could be considered as basic sharpening tool.
<a href="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25186194&Sequence=0" target="_blank"><IMG align=right SRC="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25186195&Sequence=0" border="3"></a>Extra-Fine surfaces are marked in green color. 9-micron particles (grit 1200) leave really hair-popping edge. This surface is ideal for your favorite knife fine-tuning.
Quite frequently asked question: does the finest grit leave polished edge? In my experience Extra-Fine DMT leaves the edge which I couldn't assume as polished, at least it is not shiny. Think the reason is in abrasive particle density but not in dimensions. However, literally few strokes on Arkansas whetstone or fine ceramics let your edge shine after sharpening on green DMT sharpening surface.
<center><small>to be continued...</small></center>
[This message has been edited by Sergiusz Mitin (edited 07-29-2000).]
<center><small>Patr 1 of 2</small></center>
The questions about different sharpening devices sometimes are asked here and on General Discussion Forum, so I decided to share my experience on sharpening equipment I have tried and/or I'm currently using.
First in this series let be DMT sharpening surfaces. It is well known that diamond is king of cutting. This is the hardest known material in the world, no one natural or man made material can beat it in hardness and as result - in cutting abilities. So it is a good idea to use diamond as abrasive material to obtain controlled steel removing from cutting edges what we usually call sharpening.
Construction. Diamond Machining Technologies (DMT) sharpening surfaces are created embedding diamond powder with strictly calibrated grain size onto steel surface using electrolyte nickel.
<small>Please click thumbnails to open enlarged image in separate window</small>
<a href="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25171900&Sequence=0" target="_blank"><IMG align=right SRC="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25171901&Sequence=0" border="3"></a>Most of DMT sharpeners (but not all) have diamond particles embedded onto steel surface perforated with round holes about 3 mm in diameter. These holes are filled wit plastic which makes up the sturdy base under relatively thin (about 1 mm) steel plate. This way steel plate is connected to plastic base near indestructibly, I can't imagine situation when it could be torn off. The interrupted sharpening surface have some advantages: first of all it allows to save some diamond powder what allows to reduce production costs and as result - price. Another advantage - interrupted surface is less prone to clogging - is not so important because diamond sharpening surfaces are in their nature much less prone to clogging than ceramic or natural counterparts. All things in this world have two sides, the disadvantage of interrupted surface appears when you have to sharpen very small blade or blade with very sharp pointy tip. For such occasions DMT makes some their sharpeners in Machinist version with some deal of continuos surface.
Grits. All DMT sharpening surfaces are divided to four groups depending on grit. Each group is marked in different color.
X-Coarse surfaces are marked with black color. Diamond particles size 60 microns makes grit 220. This kind of abrasive provides very fast and efficient steel removing what allows to restore heavily damaged edges or to reprofile the edge with minimal effort.
<a href="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25171902&Sequence=0" target="_blank"><IMG align=right SRC="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25171903&Sequence=0" border="3"></a>Coarse surfaces are marked with blue color. Particles have size 45 microns (grit 325) what provides efficient cutting to restore very dull or lightly damaged edges. If only light edge reprofiling is required this surface is quite enough.
Fine surface are marked with red color. Particles with 25 microns (grit 600) leave very sharp working edge which matches both heavy and precise cutting tasks. This surface could be considered as basic sharpening tool.
<a href="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25186194&Sequence=0" target="_blank"><IMG align=right SRC="http://albums.photopoint.com/j/View?u=222944&a=1651094&p=25186195&Sequence=0" border="3"></a>Extra-Fine surfaces are marked in green color. 9-micron particles (grit 1200) leave really hair-popping edge. This surface is ideal for your favorite knife fine-tuning.
Quite frequently asked question: does the finest grit leave polished edge? In my experience Extra-Fine DMT leaves the edge which I couldn't assume as polished, at least it is not shiny. Think the reason is in abrasive particle density but not in dimensions. However, literally few strokes on Arkansas whetstone or fine ceramics let your edge shine after sharpening on green DMT sharpening surface.
<center><small>to be continued...</small></center>
[This message has been edited by Sergiusz Mitin (edited 07-29-2000).]