Looks like it's well engineered. Wish I had your skills. Nice job.

Beautiful job , nice guard on there, I think you have the safety covered. I like the smooth pace in cutting, some people think safety as they are working as you obviously do. Some people depend on safety devices to keep them safe. and don't think about technique. Again, great job !

When I built this I never ask for anyone's approval or complaints. Not sure why people seem to feel obligated to comment or judge things they know nothing about. I'm a big boy. I don't need people or government to tell me not to get close to a machine built to gring things when it is running. I have decided the world is full of people who "can't or won't" constantly telling people who "can and do" how they "should or shouldn't" do things.

That is a money saving deal right there.. For what you built yours for yourself, I had a tree stump cut in my yard & thats what they charged me.. Nice work.. glad you posted a video..

Excellent! Made my morning and I don't even need one! (right now...)

Interesting! Never seen a thing like this. Lots of respect for your work..

very nice, and good skill for thinking out of the box on making your own cheaper and a good sense of pride in the work...rock on.

Seems to work very well. Good job!

Looks like it works good. Good job.

That is as good as any I've seen.

great work, nothing like the satisfaction of making something yourself to do the job where most people have to pay big money for it, good job!

Thanks Sam. I was able to find a heavy round part for the flywheel. I purchased used carbide teeth from Ebay which were dull. I sharpened them and machined some holders to bolt to the flywheel. I believe the radius of the teeth is about 19" and I run it at about 4000 SF. Hope this helps.

you are amazingly talented ..

Good luck with your project!

Thanks for your kind words. You are right. It is very satisfying to build your own tools.

Nicely done! Judging by the smooth technique it looks like you've done this a few times.

All good. I was going to say something about a face guard against the rogue chip that finds its way to your tender parts, but I see you've got that well in mind. Very efficient use of equipment you already have. Good thinking.

nice job , works good .

compliments! it work very well:)

I want one!

You are way too kind. Thank you.

very good man.

Thanks! Used it again this weekend. Ground about 15 stumps.

Thanks for your kind words. I believe common sense is the best first step when it comes to safety.

nice job i want one!!!

Very powerfull and vice machine ! Thumbs up;)

hands of a surgeon...

Thanks for your kind comments Bryce.

@huntlone I designed it to run around 4000 SFM. It is direct drive.

AWESOME!!!

nice job

@tibuflavius Thanks. Hope everything is good in Romania!

Hello. I purchsed some used worn carbide insert through Ebay. I used a greenwheel to sharpen them. I then machined some clamping brackets and bolted them to a round piece of steel I machined from scrap. I believe a truck flywheel would be a good substitute for the wheel. You can also purchase clamps through the internet but I was too tight to purchase them. Hope this helps. Good luck with your project.

i made same years ago and still make lots of cash with with it, good show

sure beats the hell out of that one I had to rent from Home Depot.....

if you were to make more of those to sell you would be one rich man

@rdorrel its all good.. just lookin out for you.. More power to you for getting it done that cheap.. nice to have tools in the aersenal

Nice job! I have wanted to build one for years but I just don't grind up many stumps. But when ya have one in the way after a storm they are sure handy. The few times I hired one to come in and take out a stump I could have made one for the tractor. Oh well, some day maybe. I like yours. I wonder if I could run it off the PTO? Cheers!

thanks a bunch

I machined a solid coupler between the two shafts. I believe a chain coupler would be the best choice but I was too tight to purchase one. I am not sure if a jaw type coupler would work. I was concerned the insert would allow chatter to develope with the intermittent cut causing premature failure. But then again it may work fine?

We have alot of tree stumps to clear. This looks like a great idea.What specification hyd motor did you use?

Thanks! Sorry I don't have an stil pictures posted. But hopefully this will help. I machined some pockets similar to ones found on Ebay with two bolts and a slot for the 1/2 square tooth.

Thanks for your comment. It would be easy to build them affordably. However I am sure regardless of how much guarding I put in place someone would figure out a way to get hurt and sue me. Politicians and Lawyers have created a world where no one is responsible for their own stupidity and there is always someone else to blame.

As usual, people hating on an primitive invention for home use but envious once its in production.

Hello. I used a Permco hydraulic motor with 2.57 cu. in displacement. The displacement can vary depending on the amount of flow and pressure you have available for your supply. Hope this helps.

I have a JD 250 Skid Steer standard flow hyd. what size hyd motor did you use to get the RPM I see in your video thanks MAK

The hydraulic system has a relief valve which keeps the pressures from exceeding the components maximum operating pressures.

well said sir.

@arnoldcustom Good deal. Maybe when I retire I can use it more.

Oh, that's cool. I don't think I'll attempt my own pockets. I found something called greenteeth and I think will mount on a 3/8 wheel that is 14 inch diameter if that sounds reasonable. Scott

hi love the way it grinds , what is the gpm my bobcat is a 530 and has about 8.3 gpm. what kind of motor did you use, i think if igo with a smaller wheel like about 12-14 inch i would be ok. thanks for the ideal

Thanks gregall.

Great project! Do you have still pictures of it anywhere on the web--i'd like to see how the teeth attach etc... Thanks, Scott

Well , that works

@geneticrabbit Thanks for your comment. It's not that hard to build. Go for it.

OH to be an engineer! And to think a vermeer 652 will set you back $65k

@shooterm24sniper The teeth are 1/2 square shanks with carbide tips.

are you running directly off of the hydraulic motor with a lovejoy coupler or do you have a chain settup thanks again

Although I didn't build this with someone's "nice yard" in mind I can maneuver very well without leaving marks. There are vast areas of the country just like the one I live in,(rural),where this machine works very well. Believe it or not we have trees too. And they blow down and die from time to time. We have ten acres and a very nice yard. You won’t find a mark where my skid loader has passed. So maybe you should get out of your neighborhood and then you would realize it’s not “useless”.

The biggest issue I see is you need flat ground underneath the loader so the operator can control the cutter height. It is working good in the video but most places I grind are not that flat and smooth and moving the loader would cause some bounce that would stuff the cutting wheel into the stump.

@lethallarry1 Thanks!

@500passwords Thanks. I appreciate your comment. I used it again yesterday.

i was thinking of building one but i always come to the same prob ... the cutting wheel do you have carbide inserts in it what did you use for the wheel thanks

@urbex2007 Thanks. I appreciate your comment.

What is the cutting head made of?

how long does the blade or blades last on it before you have to change them???

@Urakoitsija1 Thanks!!

Sorry for the late reply. I used cemented carbide 1/2" square teeth.

@Urakoitsija1 Thanks. I appreciate your comment.

Where did you get the cutting wheel and teeth from? I would like to build a pto driven stump grinder but the replacement plates from companies like Vermeer are expensive.

It reminds me grindcore.

Sorry for the late reply. The motor is 2.573 cubic inches.

@junekentucky Sorry I don't have any still pictures. Thanks for asking.

@poptart1702 I bought some used 1/2 square carbide cutters on ebay and sharpened them. I was too cheap to buy new ones. Sharpened ones work just as good. I machined the holders. New ones are available on ebay but once again I was too cheap to buy them.

Thanks. I appreciate your comments.

And when the carbide breaks or wears out, get yourself an Acetylene torch, some silver solder, and retip them yourself! Its very easy. You can also get cheap diamond wheels on ebay, and rig up a water sprayer to cool as you grind them. Just remember, its not rocket science!

Drill a hole, Poor black powder in at $16.00 per pound, pack it in, light a fuse and run. When it blows you still have a mess to clean up and a hole to fill. In Three minutes I am ready to move to the next stump.

Nice grinder. Might work off a tractor PTO? One observation on safety: Should grind starting the other side, so that cutter is fed into stump so that it tries to push away rather than climb on top. Climb cutting can result in cutter climbing onto and over the stump in a very sudden movement that would be dangerous, twisting the whole thing.

@rdorrel

9 жыл бұрын

Theodocius Eustacius Tractor PTO's run 540 RPM. To create the proper surface feet of speed the flywheel would need to be much bigger. Climb milling is the most efficient way to cut. Never have an issue if crowded too much the relief valve protects against sudden overload. It's to rigid and heavy to bounce. Besides if you throw the chips into your work area you cannot see what you are doing.

@PyroShim

8 жыл бұрын

+rdorrel newer tractors have a higher pto speed of 1000 rpm.

@jhomrich89

8 жыл бұрын

+PyroShim If you're talking higher horsepower tractors yes some of them have dual speed 540 and 1000 but almost every tractor under 100hp is going to be 540, 100hp or more you'll start to see dual speed PTO or just 1000. Or you could run it off the rear hydraulics if the tractor is equipped with those.

@jhomrich89

8 жыл бұрын

+PyroShim If you're talking large tractors over 100hp yes they are but many machines in that class also have dual speed PTO so you can do 540 or 1000. Or you could run this off the tractors hydraulics if equipped with it but with tractors like that it's basically standard.

@PyroShim

8 жыл бұрын

+Jon Homrich I don't drive tractors under 80 hp but new tractors above 80 hp almost all have a dual or triple (540, 750 and 1000) speed PTO.

i have a gehl skid steer with a 20 gpm standard flow...can you list all parts needed to put this attachment together and where to get it online..... i already have the quick attach plate on hand...thanks great work

@rdorrel

8 жыл бұрын

Hello Al. The only components I purchased on line were the cutting teeth. I found some used (dull) ones on ebay and sharpened them. I purchased the motor from rumpkehydraulics.com. My skid loader is smaller and my aux. flow is 16 GPM. I determined the diameter of the cutting circle and the surface footage I desired for the grinder. I believe I I decided on 4000 SFM? Please bear in mind I don't know it this is the best speed but so far it works well for me. Especially since my combination of flow and pressure only creates about 16 hydraulic HP. The bearings, drum, steel, etc, I had on the shelf. Here's my offer. Once you determine the diameter of the drum you want to build, and you determine the RPM you want to turn it. contact me and I will determine the displacement of the motor you need. Hope this helps?

@albash4545

8 жыл бұрын

what kind of bearings should i use?

show us the cutter statically!, and tell us what was done to create it!

@oldstumpcutter Sorry for the delayed response. It did not require a lot of flow. I used the standard auxillary pump which creates 16 GPM. Thanks for your comment.

hi were can i get parts to build one im a gear head too

turn the drum vertical

@mikedavis5671 Thanks. Although I wouldn't mind building more I have no interest in dealing with the lawyers the sue happy public would bring with them.

If you can make one, why rent or buy? good work fella.

But they don't sell it in a store by a huge corporation. So it can't be any good...nice work.

drum is 16 inch by 1/2 inch thick. i am not sure about the RPM.. I appreciate the help

@rdorrel

8 жыл бұрын

Hello Al. A 16" circle has 4.19 feet circumference. If you want to spin it 4000 SFM you will need to run it 954 RPM. 3000 SFM would require 754 RPM. If you have 20 GPM to work with a 4.84 cu. in motor will turn 945 and a 6.12 will turn 754. Pls bear in mind these are theoretic numbers. Your pump will most likely only create 90-95 percent of it's flow under full pressure and a gear motor has approximately the same efficiency I did not ask your system relief pressure? Guessing around 3000 PSI? Regardless it won't change the displacement of the motor but higher pressure = more torque. I chose a Permco 5100 series motor and there are gear sizes which would come close to fitting your requirements. A 1.75" wide gear is 4.50 CU. IN per rev and a 2.25" gear width is 5.78 CU. IN. per rev. They have an excellent web page with a pump configure option. www.permco.com/permco_products/5100-series Hope this helps. Good luck!!

@albash4545

8 жыл бұрын

can i use use a wheel hydraulic motor? im having my cutting wheel custom made out of 1/2 steel. 20" or even 24" in diameter. if i bolted this wheel to a wheel hub would that add to the stability of that turning wheel? is there a minimum rpm for a stump grinding wheel?

@albash4545

8 жыл бұрын

check link to see wheel hub www.surpluscenter.com/Hydraulics/Hydraulic-Motors/Wheel-Hubs-for-Hydraulic-Motors/5-BOLT-WHEEL-HUB-1-1-4-TAPERED-W-BRAKE-DRUM-1-3364.axd

@albash4545

8 жыл бұрын

otherwise how would i attach grinding wheel to the motor

@rdorrel

8 жыл бұрын

Most likely the only motor you will find with a 1 1/4" tapered / keyed shaft will be a gerroler or geroter design. They make great wheel motors because they are very efficient. Unfortunately, because of their design, they are limited on maximum RPM. I don't believe you will find one rated for the RPM you are looking for to use with a 16" drum. If you choose a larger drum you can spin it slower and still create the same FPM as a smaller drum. Your machinist should be able to put a keyed shaft in your drum and you can couple it direct to a straight keyed motor shaft. That's how I did mine. A chain coupler will work better than they insert type?

why climb cut, seems like you could have a catch and throw or stall the machine

@rdorrel

9 жыл бұрын

ironlionkalo Climb milling is the most efficient way to cut. Never have an issue if crowded too much the relief valve protects against sudden overload. It's to rigid and heavy to bounce. Besides if you throw the chips into your work area you cannot see what you are doing.

why not just hire or rent a stumpgrinder, can do forty stumps in a few hours with all all the roots to a depth that exceeds 400mm. Depending on the market it would cost about $350.00..Nice effort on the engineering your own attachment

@rdorrel

8 жыл бұрын

I'm a gear head and like the challenge of building things. I have added the following home made attachments. A log splitter, a post hole digger, bush hog, and a back hoe. I have used the grinder for myself, friends and neighbors for several years. The trees keep dying. I ground 15 more this fall at home and 8 more for my neighbor. I can grind up to 18" deep without problem. I have less than $300.00 in it so its paid for itself many times over and it nice have it available whenever the mood strikes. :)

@kangarojak

8 жыл бұрын

well done, stay safe

anybody dig even a little incase there is a rock????

@rdorrel

9 жыл бұрын

thomasbroking No. The teeth are carbide. Harder than rocks. It just pushes the smaller ones aside. Never hit a huge one yet but I'm sure it would just bounce around until you quit digging. Good question.

can you take closer pictures I am a visual person

Why not just blow it up?

All that for just a spinning blade? WTF?!?!? LOL!

See what? You built a stump grinder, but out of what? What's it look like? Does it have teeth welded on it or did you notch teeth into it? You see, the whole video this thing you made was spinning the whole time and we couldn't see diddly. Whatever it was, it worked well.. is it a secret?

@rdorrel2324

7 жыл бұрын

Sorry Timothy. "See What" Didn't promise any still pictures. "out of what" Not obligated to provide a build list. "What's it look like" guess you'll have to use your imagination.

Go faster.

if i would have a chainsaw,a shovel i would done it faster ,better, cheaper, not desturbing animals sorry for bad english ,i salute from romania