So how would you build a stump buster

[SpringHollow]

I think that small one is fine. They never show how well it works when you do not have enough wood left for the center bit to bite in to. Hard to say if the bit just gets pushed to the side.

Ken

Found a post from 2002!!! http://www.tractorbynet.com/forums/power-trac/14547-need-pt-stump-grinder-info.html

 

[lduren]

Check out these:
YouTube - John Deere 8100 and Rotor S stump grinder

YouTube - Rotor stumps extractor.

YouTube - Levaceppi Rotor S Stump cutter New Holland NH 8240

That is a great tool, but I have googled it a little bit, cant find out where to buy this. I did see a stump cutter, similar to the stump extractor except it cuts the stump, being sold used though.I even tried tranlating the google search into Italian.

"comprare in linea levaceppi"

 

[ponytug]

Not being one to make art out of stump cores, I can't say it would pencil out for me.

However to your question, the friction goes by area, so it is an R-squared effect, but the cutting load goes up as R. My bet would be for a centered bore, it is largely R (i.e. 2*Pi*R, or 18 vs 30 on some arbitrary scale of work for 30 vs 50.)

All the best,

Peter

Thanks for the links.
I really like this one;
YouTube - Rotor stumps extractor.
There is something appealing about being able to take out a big "core" that can be disposed of or used vs making everything into chips.

Strength, weight and ballasting of the tractor is an issue, that one comes up off the uphill rear wheel at one point.
Duhh, it may be best to figger the direction of torque FIRST and face the tractor with the LEFT wheel uphill - if you HAVE TO use this thing on a side slope ?
Maybe not, rock up then down may be more likely to roll the tractor than rock down ?

Even so, BIG HEFTY tractors seem to be needed for this core extractor.
Not sure how it would scale down, but those are 45cm and 50cm diameter "hole saws" (-:
and were developed largely for root wood recovery.

30 cm may require less than 60% of the power for 50 cm - I can't quite figger if it would be a linear or a square law thang.

Not economic for ME, that's for sure.

 

[lduren]

Check out these:
YouTube - John Deere 8100 and Rotor S stump grinder

YouTube - Rotor stumps extractor.

YouTube - Levaceppi Rotor S Stump cutter New Holland NH 8240

this looks like the site to buy this: Il Levaceppi | www.ellettariluca.com

 

[SPYDERLK]

Thanks for the links.
I really like this one;
YouTube - Rotor stumps extractor.
There is something appealing about being able to take out a big "core" that can be disposed of or used vs making everything into chips.

Strength, weight and ballasting of the tractor is an issue, that one comes up off the uphill rear wheel at one point.
Duhh, it may be best to figger the direction of torque FIRST and face the tractor with the LEFT wheel uphill - if you HAVE TO use this thing on a side slope ?

Or, if theyd just arrange to keep the auger/cutter axis vertical front to back thered be much less side tip torque. Wonder why they didnt. :confused3:
Perhaps they adopted this to counteract the opposing tip moment resulting from the lateral force to the right, reacted into the tractor by the frame holding the spinning bit. With it canted forward as much as it is tho, the horizontal component of rotational torque appears to counteract this too much. Some fine tuning is in order.
larry