Trencher and poorboys stump grinder

[togoffrd]

Hey guys, what do you think, would one of these spin fast enough at 1:1 to put behind an old gear tractor or is a hydro a must have?

I am always amazed at all the creativity, talent and workmanship shown here on TBN.

 

[sandman2234]

What is a hydro? All i have is a tractor with a gearshift and a clutch...
Hp is really the name of the game. If you have enough horsepower to turn it and not lug the motor because of the forward ground speed, then your fine. Remember that I pulled this with a 13Hp diesel gear tractor. Never owned one of those new fanangled contraptions with the liquid driveshaft. I did get a used Steiner lawn tractor that has a liquid driveshaft, but it turns the wrong way for this attachment. LOL
The 1:1 ratio really isn't the controling factor in this equation. Blade tip speed is. The larger the diameter of the wheel (tip to tip), the faster the surface speed is going to be. Goes back to simple mathematics. If you want to slow it down, simply reduce the wheel size, (or shorten the cutting tips.) The longer the cutting tips, the faster the surface speed, and the more horsepower it will eat up. If you want more speed,but don't have the extra horsepower, narrow the cutters to cut a narrower ditch.
Due to safety, my guard is made out of 3/16" plate. I think it will take a few rocks tossed at it, and keep doing it's job. Hopefully I will never find out what it takes to penitrate it.
I grew up in S.W. Arkansas, in the foothills of the Ozark Mountains, where the soil is more rock than dirt. Not sure how it would stand up to that. Slowing it down might not be a bad idea! Really just depends on the circumstances.
David from jax

Seriously, about the rocks, I don't quite know what to tell you as I don't have that down here. If you are concerned about them, as a trencher, you might want to make sure to add some heavy duty rubber to the bottom of the guard to protect you and bystanders. Even old tires cut to fit might help.
David from jax

 

[Tony_S]

Hey Guys,

I thought you might find this interesting.
There are several photos of this grinder available on the site.

Gravely walkbehind stump grinder

Enjoy!
Tony S.

 

[hwp]

Sandman's posts got my juices flowing again for a stump grinder, so I have been working at designing one for my F2400. I am working on the design of two versions, a hydraulic drive (see attached) and a chain drive (attached to the next post). I would welcome any comments on the designs. At the moment I tend to favour the chain drive version. /forums/images/graemlins/smile.gif

 

[hwp]

Now the chain drive version. /forums/images/graemlins/smile.gif

 

[MMM]

I'd never think that gearbox would hold up to that kind of torque. Amazing.

 

[sandman2234]

I never thought it would hold up either, which is why I grabbed several of them, while the getting was good. Still working on the original one.
David from jax

 

[3RRL]

Boy, that sure is a neat idea.
I picked up a 1 to 1:35 reducer gearbox rated up to 100 hp. It weighs 85 lbs. I'm going to try to copy the idea using about a Ø30" cutter. Also picked up a PTO shaft with a friction slip clutch rated at 30hp. My tractor puts out about 50 PTO hp so I'm sure the PTO shaft will protectect the tractor in case I screw up. I'll keep you posted. I'm working on the design as I can...(if ever) /forums/images/graemlins/grin.gif

 

[Taylortractornut]

IT WORKS lol I finally got most of the kinks out or my version of your trencher. Ive cut 6 inches down I need to ad a few more teeth or speed up my gear box a bit. I added a set of old tiller teeth to the rotor between the paddle planer teeth. they have a curve over the top that make it peel he material off the advancing wall and the paddles throw it out. I made my guard different it looks like a flat topped fender. with one side open it stacks most of the material outside to the left of the trench. I stll need to add the foot to the back to remove al lthe material it leaves about an inch i nthe bottom of it. I have a set of wheels that are about 2 inches shorter than the ones on that particular tractor I may stick on it to drop the ground speed enough to trench the full ten inches.

 

[sandman2234]

Tractornut,
Do we get to see a picture of this thing, or not?
Since it works, (congradulations!), what it "looks" like isn't as important as how you built it. That is what we want to see.
David from jax