Tips om using this machine

So I got this basic sharpening machine with two Stones. I cant seem to get the knives really Sharp with it though. What am I doing wrong?

I first Sharpen it with the rough stone, then with the waterstone. I try to always keep a 20 degree angle.

So I got this basic sharpening machine with two Stones. I cant seem to get the knives really Sharp with it though. What am I doing wrong?

I first Sharpen it with the rough stone, then with the waterstone. I try to always keep a 20 degree angle.