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EZE-LAP ダイアモンドシャープナー LSF/SUPER FINE
EZE-LAP ダイアモンドシャープナー LSF/SUPER FINE ◆サイズ：150×20mm ★昔ながらのフックシャープナー。5段階で1番目の細かいタイプです。Made in ＵＳＡ
First make sure that whatever blade you are sharpening is clean. Gunk getting in the diamonds will reduce effectiveness. Glass cleaner sprayed onto a paper towel is usually enough. Wipe until nothing else comes off the blade.
Do not use a lot of pressure like with a coarse grinding stone (the stone guys will tell you to not use high pressure, anyways). Medium-light pressure (or less) is all that's needed. At the microscopic level, diamonds are very coarse and will easily remove metal. A lot of pressure will just break or pop them free of their bonding to the base. Then the sharpener is ruined.
Many people still use a lot of force because it seems the diamonds aren't doing anything. As a trick (for diamond or stone), take a black marker to the blade edge to color it. As the edge gets sharpened, the marker coloring will be scraped off. If you have a dark spot on the edge that won't go away, you're either holding the blade angle wrong or the blade has a small chip missing. If you have a shiny edge and the blade still isn't sharp enough, you need to switch to a lower grit until the blade is sharp at that level.
The difference between a diamond and a stone is that a diamond will keep its sharp peak and a stone will lose it at the microscopic level once broken in. This also makes diamonds seem more coarse than what they're rated for. For this reason, the general rule of thumb is to double or triple the grit number needed with a diamond pad. Examples: If I want a 300 grit sharpener for my yard tool, use a 600 grit diamond pad. If I want a 600 grit sharpener for my kitchen knives, use a 1200 grit (or more) diamond pad. There's also nothing wrong finishing off the sharpening session using a very fine stone.
I usually use a water sharpening method to flush away the metal powder off the blade. If I'm sharpening a bunch of blades, I'll usually finish the session with a toothbrush and some clean rinsing dish soap to scrub the diamond pad. This helps keep any unwanted leftovers from getting stuck between the diamonds.
As with any diamond or sharpening stone, these need to be broken in. I could feel a few areas where the blade would catch on a rough spot. Most people will sharpen yard tools or junk blades first until the hone has a fully consistent feel across the entire pad.
One very important thing to note: THESE ARE NOT DIAMOND FILES! A diamond file would be used to remove large chunks of metal using high pressure (just like a regular metal file). A diamond file is NOT used to sharpen a knife blade. A diamond hone is used to resharpen a blade that has already been sharp. These are not meant to be used to level your concrete counter tops, either (the plastic handles should give that away). I guess these could be used against small sharpening stones using light pressure only and a constant water rinse to flatten and clean up the stone's surface. Note that ANY diamond hone will not have a multi-year life span if misused (obviously).