Tree pinching the saw,

can be avoided, if machines pushes back the blade, pulls out from the tree,

and then re-angles itself, positioning the blade above the previously cut,

and then cutting towards the focal point of the original cut.

 

which can be calculated during the first cut most likely.

 

another way, is the blade remains pinched,

while the machine itself protrudes up or down,

changing the angle, but probably the blade/saw itself has to be fairly thick,

in order for this to work.

 

or both the thickness of the saw and pull out to re-insert from a different angle.

 

wait.... if the blade, initial portion is thick enough, and rotation speed is aggressive enough,

 

i don't think there's a chance for pinching.

 

don't know but i think there's a way around it.

 

 

ah. ok. two rings. one cutting from straight leveled angle,

the other one from 30 degree angle or so, both meeting toward a focal point.

if the leveled angle gets stuck, second ring .......wait,,, then the machine itself has to move backwards

but the first ring is stuck. nevermind i'll figure it out.