ok. on the tree pinching the blade. as Adam relays. figured it out.

 

 

one ring saw.

 

cuts in different heights. on the same tree.

 

machine itself moves up and down. adjusting, before the pinch.

 

surface level cut.

 

then pull out, adjust angle again, and cut to meet the focal point of the original cut.

 

repeat above.

 

angle itself can change if the ring itself has an adjustable angle mechanism, but still holding rotational speed.

 

possible.

 

will take longer to cut the tree, but will be cut down.