xm18 sharpening question

[MAXPOWER419]

I cant seem to get my xm18 sharp. I have been using the sharpmaker on the 20 degree angle. I have not have problems getting my other knives sharp, so what gives?

Thanks

 

[Kaizen1]

The edge is probably thicker than your other knives and you haven't reached the edge yet. Use a magic marker and try a few swipes on the sharpmaker and see if there's still ink on the dge afterwards