If I have a grinding / sharpening system at home, knifes gets sharp there. The knife do not get dull at home, knifes gets (most often) dull outdoors, far away from home.
The most important spot for my knife to be sharp is the spot where it gets dull, this because I use the knife hard on just this spot.
The conclusion is that I need to sharpen my knife on just this spot, whereever this spot are located, in winter and summer, in sunshine and in rain.
The sharpening must, at least in my mind, hold the same sharpening angle there is on the knife, because then the sharpening is made fast and in exact the right sharpening angle = I need to take away just minimum of material of the blade. The sharpening goes fast and I can continue my work with the knife.
That’s excluding freehand sharpening, at least for me. If I sharpen the knife by hand, it will be slightly convex. I do not like that a straight edge I have choose for this knife shall be convex. It must still be straight.
When I understand this, I need a sharpening system who give me the exact angle I need – on all my knifes. I do not like to have a sharpening system for just this particular knife. The system shall fits all knifes and all sharpening angles there are – on any knife.
If the knife I use is convex, the problem is smaller and I can sharpen it by freehand without changing the convex curve – and continue my work.
Then, perhaps I need to make bigger jobs on the edge, perhaps change the sharpening angle or grind away some damage on the edge? Then I also need a bigger grinding system at home – and perhaps a reserve knife with me outdoors when I know I shall do heavy work.
If I, of some reason, can only have one system, I choose the sharpening system I can use outdoors because I can use that system also for bigger jobs –it takes time to do it – but I can. Just where I need to do it.
If I choose a grinding system to use at home, I must go home and make the sharpening. If I, for example, is a hunter, 100 km from home, and butchering fresh meat – that is impossible to do. I need the knife sharp on the spot, now.
For me, that’s means that I have high commands on the sharpening system and the sharpeners in the system. It must be extreme high quality in all parts. It shall be able to sharpen all my knifes, in all types of climate, in all types of weather, and the function shall be easy, fast and trustable.
I use both straight edges and convex edges on my knifes, depending on what knife I use for the work I shall/must perform. That make it important for me that the sharpening system I use shall be able to sharpen both straight and convex edges – with free sharpening angles, because, most off my knifes have different sharpening angles, sizes and blade shapes.
Depending on the blade shape of the knife I use for the moment, I also like to have a sharpening system who can sharpen both parallel, three shaped knife blades and also recurved knife blades – and I have also a demand that I shall be able to sharpen big blades, small blades, and miniature blades - with the correct sharpening angle.
When I have only one system, I also like to be able to sharpen axes, scissors, chisels, and woodcarving tools, and so on, with the same sharpening system.
Thomas