Backhoe Ripper tooth - Again

[wedge40]

I found one of these from a few years back on TBN and have decided to draw one up so I can take it to a shop and have it made. Attached is a pdf of my initial drawing. I'm looking for opinions. Let me start by saying I'm not totally sure of some of the dimensions since my backhoe isn't here. But the basics are there.

Wedge

 

[wedge40]

Someone asked that I post the DXF file. So here it is zipped up.

Wedge

 

[IslandTractor]

I'd think you'd want some support to prevent twisting or lateral bending of the tooth. Here is an example using simple welded wedges at the base:

 

[wedge40]

I'd think you'd want some support to prevent twisting or lateral bending of the tooth. Here is an example using simple welded wedges at the base:

Nice drawing.. It's given me a few more things I need to think about. Thanks.
I never thought too much about the twisting forces. I like the idea of the triangle front middle and back. Also I like the angle iron between the mounting points at the top.

This one looks a tad short. I'm thinking with a somewhat sharp leading edge I could sort of cut through the really big roots instead of just ripping them apart.
I do plan on having a hardened bead welded on the front edge and I might even grind some serrations into it.
Guess I'll get the think built then modify as I go along.

You would have a drawing with dimensions would you?

Wedge

 

[IslandTractor]

This one looks a tad short. I'm thinking with a somewhat sharp leading edge I could sort of cut through the really big roots instead of just ripping them apart.

I find most roots are pretty soft and do rip pretty easily even with a 18inch bucket distributing the force widely. I was thinking just a slightly beveled (45 degree) leading edge would be adequate to cut roots and would be easy to maintain. Not sure I'd bother with putting a hardened edge on it as you could pretty easily build it back up if it does wear and you could build up some serrations later if the plain wedge was not sufficient. The big excavator rippers don't seem to have any fancy features at all except maybe replaceable teeth.

 

[IslandTractor]

This one looks a tad short. ....You would have a drawing with dimensions would you?

Wedge

The dimensions in the drawing can be varied depending on the size of the backhoe or excavator. I'm guessing that a Woods BH90x is about a 2-3 ton category. That would give a tooth depth of about 18 inches which is roughly the same as the bucket depth from the mount. I was thinking half inch steel would be fine but I see this table specifies closer to one inch so I'll need to think about that.

 

[wedge40]

The dimensions in the drawing can be varied depending on the size of the backhoe or excavator. I'm guessing that a Woods BH90x is about a 2-3 ton category. That would give a tooth depth of about 18 inches which is roughly the same as the bucket depth from the mount. I was thinking half inch steel would be fine but I see this table specifies closer to one inch so I'll need to think about that.

I'm using 1" plate for the tooth/shank part of the ripper, 1/2 or 3/4 for the top plate and 3/8 for the mounting section.

Again I pretty much followed this design.
http://www.tractorbynet.com/forums/...oint-ripper-tooth.html?highlight=ripper+tooth

I think what I'll do is get some teeth before I have it made and then give it to the welder and he can figure out how to attach.

rswyan said he could remove stumps in about 10 minutes vs. 30 or more with the bucket. I'm guessing the hole will be smaller when done with the tooth as well.

 

[wedge40]

Well I'll bring this back to the font of the pile. I got the email today that the Backhoe ripper is done and ready to be picked up. I wont be able to get to it till Friday, but once I get it home I'll post some photos.

Wedge

 

[Eagleview]

You wll find the tyne will slip around the bigger roots as they follow the ark of the tyne possibly forcing your crowd ram to overcome the relief valve . You may need to weld on a hook about a third the way up to catch the root and tear it . You are welcome to look in my gallery at my root ripper i had built .

 

[wedge40]

Well it's here. Attached are some photos.. It'll be a few weeks before I get to put it on and give it a try. Bob, (the guy who make it for me) did a good job and even made it a tad more stout than I had asked. The shank is 1 1/2" thick, and is made up of three 1/2" plates sandwiched together. Someone had suggested this and I'm glad Bob did it.

Shank thickness.

Sort of a view of the whole thing.

Tooth.

Whole thing.

Wedge

 

[IslandTractor]

Wedge, that looks great. Have you had a chance to use it yet? Action photos? What did it cost to have fabricated?

 

[wedge40]

No haven't had a chance to use it yet. Been colder than a well diggers....
I just purchased a PTO pump off ebay.
The cost to have it made was $320. Not sure what the Bro-Tek cost, but I'm pretty sure this is way more stout. I'm very pleased with the way it turned out. And yes as I start to use it I'll post before, during and after photos.
Keep watch on this thread.. I dont plan on starting a new one.

Wedge

 

[wedge40]

Update: Finally got the BH up and running today and tried out the ripper tooth. Seem to work pretty well, but I'll need much more seat time to figure out what I'm doing with the backhoe. I started on some really big roots and so far they have won the game. I think I'm going to have to try and not dig right next to the stump, but maybe go a few feet away.
I've already managed to bend some stuff on the backhoe and for now it still basically works. I'm either going to have to get replacements at some point or have some made. I think I'll look into having them made that way I can add some reinforcement so they wont bend next time.

But I'll tell you one thing, the 1000+ lbs on the back of the tractor sure help with how well the loader and stuff works.

Wedge

 

[IslandTractor]

What did you bend? I haven't managed to bend stuff on my BHs yet.

 

[wedge40]

IT what is circled is what I bent.

I'm not sure how this happened, but when I get new ones I'll reinforce these.

Wedge

 

[IslandTractor]

IT what is circled is what I bent.
Wedge

I believe that is the main upper right whatchamajigit . Did it bend while you were simply scooping with the bucket or was some sort of lateral force involved? What kind of backhoe is it?

 

[wedge40]

I believe that is the main upper right whatchamajigit . Did it bend while you were simply scooping with the bucket or was some sort of lateral force involved? What kind of backhoe is it?

I dont know when it bent. I was busy learning what to do. It's a no-name Chinese backhoe. The controls seem intuitively backwards. Yesterday was it's maiden voyage. I was working on some 2" - 3" roots and every now and then the ripper would get stick. Couldn't move forward - Couldn't move backward.

I'm going to write the guy I bought it off and see if he can get me new ones or at least a full size template.

Wedge

 

[RonMar]

Well that looks like a Jinma Backhoe. A HW-03 or LW-06? That seems like a weird part to bend to me, Do you have a pic of the bend? With the safety set properly, mine seems to stop before things get overstressed. That part is to stabelize the end of the cylinder and help it push the curl force around the end of the dipper. As such, it is pretty much always in tension when curling and not likley to bend. When uncurling/dumping the bucket, it would come into compression. Is it possible that perhaps you backed it into something? Doing this or trying to uncurl against an immoveable object could have bent them. Do you have a pic of the bent links?

 

[wedge40]

Here are some photo I took just now.

Yes it could have gotten bound up trying to back the ripper tooth out of the ground. Like I said when I get new ones I'll figure out a way to add stiffeners so it wont do it again.
If anyone knows where I can get Jinma backhoe parts that would be nice. They do look interchangeable. I've sent an email to the guy I bought it from asking for parts or template to make new ones.

Wedge

 

[Skyco]

I think they bent because the back end of your ripper plates dug into them. The last and next to last pics clearly show where the contact was made.....
If you look at the picture of the black backhoe the bucket mounting has rounded ends to provide clearance. Your ripper has larger square ends...that hit the curling links..