Originally Posted by PianoAl
I've had the electric Chef's Choice 100 knife sharpener for over fifteen years.
I have the feeling it's not doing much to sharpen the knives these days (Chicago Cutlery).
Do they wear out?
How can I tell if it's doing anything?
Can I fix it in any way?
I have the 3 stage 120 model. I rarely use the 1st stage, but when it's necessary, the aggressive grit brings a very dull knife into the range where the 2nd and 3rd stages will finish the job. Because it takes off a noticeable amount of material, I don't use that 1st stage unless it's really necessary.
If a knife has been resharpened too many times, it gets worn into the thicker part of the blade and probably needs replacing.
I don't think that the grinding wheels are replaceable.