This video clip is a brief description of how its done. Next I will break it down into steps and follow up with the longer version of this clip
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a steel on the other hand ( the one used in the video) has parallel ridges along its length and is the correct tool to sharpen a kitchen knife because it doesn't leave burrs. A quality knife should last many years but will eventually over time it will become impossible to sharpen. I only comment because i hate it when people with little or no knowledge of a subject feel the need to criticize another publicly. The person who made the video desrerves praise for taking the time to pass on his/her skills.
First, a steel is short terminology for a steel rasp...it is a type of rasp. It can have either edge type on it, just as any rasp can. (And actually, there are more than the two types you mentioned, but for brevity's sake I won't go into it).
Second, the edge of a knife does not wear away as it is dulled; it folds over on itself. A knife-edge is microscopically thin - - much thinner than a human hair. The impact of cutting causes the edge to fold over on itself. Pieces of the edge may even break off. This is important because of how a rasp (even a steel rasp) works. The traditional rasp (or sharpening steel) does not truly sharpen; it maintains the edge by unfolding it and by removing burrs. This straightened edge is still weak and quickly folds again. Eventually, the edge breaks off or folds so tightly that it can't be straightened with a steel and must be reshaped.
Using a steel requires significant skill and practice. To be effective at all, the steel must be used after every 10 to 50 cuts, before the edge folds over too much to straighten.
True sharpening removes the old weak edge and reshapes a new stronger edge. This cannot be done with a rasp...or sharpening steel.
*I* hate it when someone *thinks* they know a lot about something and have to go and correct someone else they see being negative, when all the first person is doing is trying to pass on a bit of wisdom. Next time do some proper research before you correct someone else. I (almost) always do!
Yes, the person who made the video did a good job. Yet there were some small nits which I picked at... I don't expect perfection in anything, from myself or others...but if I notice something wrong I tend to try and constructively help them by educating them. Not all criticism is destructive, you know! I can't stand the freaks of today's society who can't handle anything that might possibly be negative...even if that small negative thing is being used in a constructive manner. You can't learn without making mistakes, and you can't recognize a mistake unless you are shown the correct method/answer.
Thanks for you detailed reply i do take on board what you say. I do not want an argument. I praise the producer for his efforts. accentuate the positive ignore the nits