PTO Stump/Tree saw

ns_in_tex · Dec 21, 2013

My latest project was to build a tree saw out of an old discarded brush cutter.
We may later add a hydraulic tree pusher, if we find we need it. Till then, if we have any doubts about how it will fall, we just fall it with a chain saw, then cut the stump off at or below ground level.
It will cut up to 19" in a single pass.
Together with my homemade grapple, I can get some serious work accomplished.

Zick · Dec 21, 2013

Wow, that's quite the ankle bitter you got there.

Now let's see some action videos! :thumbsup:

wsessions1005 · Dec 21, 2013

What did you use for teeth. And great job.

Bob77064 · Dec 21, 2013

Good job, that would be handy to have.

ns_in_tex · Dec 22, 2013

Well, we have not learned to take video's or post them.

Attached is pic of a 13x17 black jack tree we cut. If you don't already know, black jack is really hard wood. Probably the most hard we have in our area that I know of.

ns_in_tex · Dec 22, 2013

wsessions1005 said:
What did you use for teeth. And great job.

We had the saw blade made for us. It is made with 1/2" plate, is cut out for the teeth, then has a 3/4x3-1/2 bar welded in to mount the carbide insert to for cutting. Insert is 3/4x3/4x1/4 rotatable & reversible. All 8 sides can be used.

Attached is pic, this particular one shows one of two weights we added when balancing the blade.

Renze · Dec 22, 2013

looks mean... i bet you lock up pets wife and children in the house before using it..

Bob77064 · Dec 22, 2013

Nice clean cut and nothing to grind.

wsessions1005 · Dec 22, 2013

How much did the blade cost.

ns_in_tex · Dec 22, 2013

Bob77064 said:
Nice clean cut and nothing to grind.

You can actually cut below ground level. Of course, you lower the ground level for 4' also.

ns_in_tex · Dec 22, 2013

wsessions1005 said:
How much did the blade cost.

900.00 to my door, with a spare set of carbide inserts.

stuckmotor · Dec 22, 2013

That looks like a nice peace of machinery. What make and model was the discarded brush cutter? Is the main part of the blade mild steel?

ns_in_tex · Dec 22, 2013

stuckmotor said:
That looks like a nice peace of machinery. What make and model was the discarded brush cutter? Is the main part of the blade mild steel?

The mower was a MG 10 Sidewinder. We had torn up 3 center T Gear boxes by hitting stumps, so got tired of replacing gear boxes.
The 90 degree gear boxes are 75 HP rated, 1 to 1.46 increaser ratio.

Not sure about the grade of steel. We talked to someone else who had built one & he said these people were knowledgeable on the wheels & he was happy with his. We liked his price, so just went with him.
We have probably put 8 to 10 hrs on it so far & have not rotated any tips.

ns_in_tex · Dec 22, 2013

Renze said:
looks mean... i bet you lock up pets wife and children in the house before using it..

You definitely do not want anything near that could get hit. I did fail to mention, I would sure want a cab or some other form of protection. When cutting through a tree, most chips go to the side, but if you take another pass to lower it one inch or less, chips are hitting the cab heavily.

stuckmotor · Dec 22, 2013

ns_in_tex said:
The mower was a MG 10 Sidewinder. We had torn up 3 center T Gear boxes by hitting stumps, so got tired of replacing gear boxes.
The 90 degree gear boxes are 75 HP rated, 1 to 1.46 increaser ratio.

Not sure about the grade of steel. We talked to someone else who had built one & he said these people were knowledgeable on the wheels & he was happy with his. We liked his price, so just went with him.
We have probably put 8 to 10 hrs on it so far & have not rotated any tips.

Thanks for the response. I could really use one of those.

pycoed · Dec 23, 2013

I reckon you need to beef up the side plating on that. The energy in 4+ foot of 1/2" plate rotating at 540 rpm is mind boggling. Do some sums, but I reckon you'd need at least 3/4 plate around it rather than the 1/4 stuff it looks like. At the moment if that gearbox output shaft let go people in Mexico would be saying "What the F*ck was that!"

Steppenwolfe · Dec 23, 2013

That is the scariest thing I have ever seen...

ns_in_tex · Dec 23, 2013

pycoed said:
I reckon you need to beef up the side plating on that. The energy in 4+ foot of 1/2" plate rotating at 540 rpm is mind boggling. Do some sums, but I reckon you'd need at least 3/4 plate around it rather than the 1/4 stuff it looks like. At the moment if that gearbox output shaft let go people in Mexico would be saying "What the F*ck was that!"

It does have lots of momentum. I have cut a 1-1/2" then moved & cut a 3" tree after disengaging the pto. It does slow down very fast (and can even bog the engine down) when it engages the ground, much like a rotary mower. It has two layers of steel between it and the tractor on the front side, and on the rear side it is below all the steel, so I can cut below ground level. Normally we are 1/4 mile away from any living beings.

Dan Hunter · Dec 23, 2013

ns_in_tex said:
Normally we are 1/4 mile away from any living beings.

And will likely remain so if that monster starts throwing chunks at dwellings! Way cool!

Pacman · Dec 26, 2013

very nice use of being able to multitask an implement can you possibly send me some info on how to change my bush hog this way if its not too much trouble?