So how would you build a stump buster

[MossRoad]

I would say look again not at how slow they are turning but at how those large tractors are moving around. I can not believe that our machines would survive. Our loader arms have no sideways bracing while 3 pt hitches have some.

Ken

What I meant by "look again", was meant to show the RPMs were much less than the first estimate.

I agree that our FEL arms would not be up to taking that beating.

 

[MossRoad]

... I am stil l wondering why a stump grinder with all the vibration, or a 30" planter head post hole digger isn't any more stressful than this device...

I think it all boils down to torque. I had an old IH tractor with HST and high/low range. I could bump into 10" trees in high range and stall the tractor or I could push them down and drive over them in low range. Same engine behind the same hydraulic pump pushing the same amount of fluid. Just the gearing on the end is all that mattered. The stump grinder spins at a pretty high RPM compared to the stump busters we are discussing in this thread. So does the post hole auger, from what I have seen. I imagine that if you increased the size of the post hole auger motor so it spun slower but provided more torque, you could easily split the bit if it bound up on something instead of stalling or bypassing as it would now.

I do think a stump buster would put tremendous sideways torque on our FEL arms. Those 3pt hitch arms on those large tractors in the stump buster videos are proportionally much shorter and stouter than our FEL arms. They can take the torque of a six bottom plow in dirt while turning. Our FEL arms are too long of a lever to survive that kind of torque, I suspect.

 

[Reg]

Below is a much smaller version of stump remover. I have thought about this option for a skid steer. Some of the planetary gear drives on post hole digers would appear to be strong enough to handle this type cutter. Might need to fabricate the actual auger/planer.





Exac-One Ltd - Stump Planer

That is interesting, though they publish that it is suitable for mini ex down to .75 tonnes.
{errr, 750 Kg ? =~1650 lbs - - that is mini-micro tractor range, right ?}

I have run right into roots by accident (negligence ?) with a post hole digger and some times the auger will just grab ahold of wood and start chucking up chips - NICE when it works out - UGLY if/when it binds up (-:

I have often thought that a Cat 1 tractor could take a wood boring bit in the 6 to 9 inch range and SOME enterprising outfit probably makes them {SHOULD make them ?}

 

[J_J]

So JJ, why is this a motor you would choose over the other? I see it says heavy duty, but if you are running through some sort of planetary set then the stress would not be so much on the motor, would it? Also, the wheel motors I presented had much higher torque figures.

Just curious as I am learning.

And yeah guys, I split my PT in half. I don't think I am going to risk this in the long run, although I am stil l wondering why a stump grinder with all the vibration, or a 30" planter head post hole digger isn't any more stressful than this device...

The hyd motor that I posted running through a planetary gear box was figured in in lbs, and then converted to ft lbs, so your hyd motors in lb's convertes to 1312 ft lbs. So the motor and gear setup has much better torque than the wheel motor driving directly. .

The rpm of the direct hyd motor is a little high.

 

[SpringHollow]

What I meant by "look again", was meant to show the RPMs were much less than the first estimate.

I agree that our FEL arms would not be up to taking that beating.

Hi Moss,

I knew what you meant but I was just pointing out to our own PT maniac that there are limits to our tractors - he just chooses to ignore them

I think it results from all of the toys he sees in his job. I just hope he is never a producer on one of those Transformer movies!!!

Ken

 

[Clumber]

Hi Moss,

I knew what you meant but I was just pointing out to our own PT maniac that there are limits to our tractors - he just chooses to ignore them

I think it results from all of the toys he sees in his job. I just hope he is never a producer on one of those Transformer movies!!!

Ken

A great plot for a movie might be one where several objects resembling meteors land near Tazewell, VA. Soon a strange radiation begins to turn little green tractors into transformers that continually try to modify their hydraulics...

 

[MossRoad]

Hi Moss,

I knew what you meant but I was just pointing out to our own PT maniac that there are limits to our tractors - he just chooses to ignore them

I think it results from all of the toys he sees in his job. I just hope he is never a producer on one of those Transformer movies!!!

Ken

:laughing:

 

[Gravy]

A great plot for a movie might be one where several objects resembling meteors land near Tazewell, VA. Soon a strange radiation begins to turn little green tractors into transformers that continually try to modify their hydraulics...

Schweet!

 

[Reg]

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.

 

[3238dpw]

I would guess the OP got the idea from here as we have been talking about them on another thread. If this machine could handle it, is it possible our 425s could?

Well I relized that I never posted the link
Avant Attachments
If you look at the compatability chart you see only the smallest tractor are not compatible. So everything including and above the 400 tractor will work with this type of stump buster. I would say the 400 is similar to the 425 in size. What do you guys think about it?