John Juranitch (honing lesson)

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John Juranitch (honing lesson)



John Juranitch (honing lesson)

Messaggioda Aldebaran » 26/04/2010, 13:53

John Juranitch begin 'to be interested in sharpening, knives and stones when I start' to do the job as a barber during the Korean War.
Everything 'that we know on sharpening, even a freehand, we owe it to him.

The basics of sharpening, also described in his book (the Bible for all affiliates of knives) are:

1.The 'use of the stones must be dry or water, never oil.
This is because 'oil saturated almost blow up the pores of the stone, whether synthetic or natural, allowing the metal particles removed remain on the surface, and are only a nuisance during the sharpening process, as the substance in question ensnares the .
The water instead imbibe the pores, causes the metal particles are removed simply by rubbing the stone with your finger (thumb) of one hand.

2.The 'corner to keep the knife on the stone during the sharpening process and' of about 20-30 degrees.
You can 'use duct tape to put on the back of a knife or razor (another Scotch with the water off after a few passes) in order to easily maintain the constant angle at work.
If you are, once removed the tape, glue residue on steel, you can 'use ethyl alcohol and cotton balls to remove them.

3.The grinding stones should be used in succession, the more 'grit, the less abrasive.
In other words, more grit than with 'bottom up to one with more grit' high.

4.For initiate movements to be done on stone with the blade can be circular, or semi-circular, clockwise or counterclockwise, to remove most 'metal in excess.

5.La pressure must not be excessive, only the right affinche'la blade rests well on stone (the latter perfectly smooth).

6The subsequent movements, other stones may be the classics, which are found on this site, viewing my videos sharpening.

7.Dopo have taken the first steps on the stone, the most 'raw, it would be useful to turn the blade and see if the wire "nibbles" thumb.
If this' happens, continue for a while 'on the same stone (the experience in this case is the host), and then gradually move on to those more' purposes.

8.Cio 'means that once touched the wire, which continues to sharpen the blade on the other side, and after a while' you end up alternating steps 1:00 to 2:00 on one side, 1:00 to 2:00 on the steps.
The best movements to be implemented are those with X, which make uniform the wire from the heel to the tip of the blade.

9.Seppur Juranitch prefers the use of dry stone, I prefer the water, though, and as 'an excellent heat sink useful in all cases where there is' at stake friction.
Council also demineralized water (distilled) as the excessive "hardness" given by the various mineral liquid threat to the sharpening.
At this point you know that football and 'directly responsible for the negative effect of the above.

10.Per regard to the Belgian stone, as well as water use, I end the use of the sharpening dry. This 'makes the edge very sharp, which for a razor and' very important as it has to shave.

11.EEC type 'sharpening angle, at least for the case of razors, I prefer zero, rather than 20-30 degrees even.
Although the work we do, or in our case, sharpening, and a known physical law ':
L = FxSxCos (angle alpha) (1)
You'll notice that if the angle alpha 'zero, then the blade flat on the stone, the cosine of 0 and' 1, then the work '"total" or force to move.
If you raise the back of the razor-blade, with strips of tape, we will move away 'from this ideal of perfection.
You will notice in fact that even placing the cutting blade on the stone, then at an angle of 90 degrees, the cosine of 90 degrees and 'zero, then for (1) All work will be' equal to 0.
12.For regarding the razor, you can 'adopt the following technique:
12.a) affiliated with the rough stone razor blade perfectly perched on stone.
Set the bevel ...
12.b) Take a fine stone, place 2:00 to 3:00 tapes back and continue the operation of polishing.
Remove the tapes, go to the strop.
Cio'consumera 'before some' back (of rough stone), and will create '(stone end) which will make a double bevel' piu'delicato touch the blade on his face.
so also will facilitate the subsequent sharpening.
I think that regarding the delicate touch of the razor, it also puo'ottenere passing the razor on dry stone Belgian yellow.
Also, if you own slate (China, Thuringia, etc.), it can 'be useful to test the wire.
In fact, wet your fingertips with water, and moistened the middle of the stone, let us slide over the blade.
If it spread 'evenly water on the stone, covering it completely in one pass, it means that the wire and' "tense" and then ready.

13) With regard to the past on strop, I recommend using the same method is adopted for sharpening stone.
If, as we have said, you pass the stone more '"ignorant" to the more' end during sharpening, as regards the strop council to pass the material more 'hard duro.A this respect at least, if possible recommend the use of serrated roller gypsum and talc at the end of the whole operation.
14) If you were to use, even before the stone grinding wheel, to fix chipped razors, knives or poor condition generally, the discourse and 'the same, use the wheel more' abrasive to the least abrasive.
This system is used to gradually clean up the scratches.
The speech also applies to the use of abrasive pastes for the restorations (rust removal).
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