That's the basic idea.
In practice it's only possible to do maybe only 1 in 5 cuts like that all the way through the log because it relies on a bunch of things all lining up.
Chain has to be as sharp as possible
It works best on softer logs (don't get many of those) with smooth or no bark and preferably no branch unions or other stuff to impede the progress of the CSM.
If the log is too long and you want longer lumber then it's not always possible to put enough of a slope onto the log
Wheels on the inboard side of the mill help.
I also use log rails for most cuts and my CSM milling rails have HDPE skids on them.
A heavier CSM helps keep the CSM moving forward - some people add weights to their mill specifically for this.
That cut took about 30% longer than usual but hey I'm doing this for fun and so for me cutting time is a small fraction of milling time and while its hand-off cutting (albeit slowly) I can do other stuff like add wedges and move lumber.
When everything is lined up I can get to within about 10% of "hands on" cutting time.
I prefer to be up close and personal with the CSM so I usually only do this when I want to add wedges or get a drink etc
To optimize "hands off" cutting speed either the slope or weight has to be adjusted for every width of cut and because cutting width changes often when slabbing a trunk it's a bit of PITA to optimize cutting speed for every cut.
It worth optimizing when turning a cant into boards.
Too much slope/weight and the saw will bog and that's no good either.
An alternative to this is a winch but that's not really "hands-free"
