hi guys,

One of the best tips I've read so far was the one from Gssixgun about "reading the wave".

However, I still find the undercutting part difficult to understand.
I know a lot of parameters influence the behaviour of the water like slurry, speed, quantity of water etc.

The main thing I try to understand is; when should there be undercutting vs wave being pushed in front of the blade?

for example, I was honing on the shapton gs 1K yesterday and the razor pushed the puddle of water nice and evenly.
However after about 80 laps there was still no undercut but I could feel a smoother feel on the stone.
Also did the razor passed the AHT and TNT.
I then decided to move on to the 2K and so on and at the 4K there was an undercut, till the middle on the blade.
on the 8K as well, 16K not and on the SG20K there also was clear undercutting.

So in short; when setting the bevel, should there (Always) be undercutting ?

PS: the shave this morning wa doable, but by no means great like it should be!