Tractor backhoe - homemade

[Renze]

Let's say I can "see" the whole thing in my head and can anticipate how it will behave...that's why i draw so much before doing anything.

I know what you're talking about, and therefor i assume you got the point out of my calculation and the remark that it doesnt tell the whole picture of forces... I allways lay out a design on gut feeling, then calculate if it generates lifting and breakout forces desired, then check if the chosen section heights can take the strain... Then all i have left to do is fine tuning for weight savings

Just one remark: If you extend the line of the main boom cylinder untill it meets a point perpendicular to the main boom pivot on the swing frame, the effective arm length over which the force works, isnt much: If you pull the backhoe high up, it will have little force. It will have most force when digging deep. I think perhaps it would be better to put the boom pivot point at a slightly bigger horizontal distance to the boom cylinder attachment point, so it gets a bit more lifting force with the boom fully up. When you think it over, you'll get what i mean so i dont have to sketch it out. its the same gut feeling you talk about: when my gut is in doubt i calculate

 

[BFreaky]

I understand what you're saying. On my first drawnings (1st page of this topic) the main boom pivot was further out, but I changed that along the way because of digging depth and the stroke of main boom cylinder. This way I got the biggest loading height and digging depth. I believe that digging forces will be optimal at half stroke and boom reach where most of the work is done and as for the loading...it's a large cylinder, is must hold maximum bucket weight with no problem...

Take a closer look at latest Cat backhoes. The lower point of the boom has a simmilar position; not too far from the point of rotation

 

[Renze]

OK, i cant wait to see photos of the process of tacking the boom profiles together.

 

[BFreaky]

OK, i cant wait to see photos of the process of tacking the boom profiles together.

Me too. Right now al the material is on the cnc cutting machine. Hopefully it will be finished by the end of the week

 

[Kyle_in_Tex]

I can't wait either...

 

[BFreaky]

I'm glad you guys like my project. I hope others will also decide to start their own projects. Some things can be made better when you do it yourself then if you buy it.
Since all the parts are getting pretty heavy, I had to make a little shop crane to be able to rotate and move them around... The crane is made out of scrap that I had lying around and it's not really finished yet. Also, I finished the kingpin, made a thread on one end of it and started welding the boom swing mechanism:

 

[KubotainNH]

Wow, beefy. Great looking stuff. It will be cool to see it on the tractor.

 

[DT86]

Wow, beefy. Great looking stuff. It will be cool to see it on the tractor.

Agreed!

I may have missed this, or read it and forgot, but do you have a rough idea of what the total weight will end up being?

 

[KubotainNH]

I took a quick look on Youtube for a hoe on a Belarus 820 and found this. Tractor mounted backhoe Carlo Pesci EC6.mp4 - YouTube
That you?

 

[Nooodles]

I took a quick look on Youtube for a hoe on a Belarus 820 and found this. Tractor mounted backhoe Carlo Pesci EC6.mp4 - YouTube
That you?

I don't think that's him because under the comments they are speaking another language that could be soviet or vietnamese

 

[BFreaky]

I don't think that's him because under the comments they are speaking another language that could be soviet or vietnamese

Yes it's my video clip. That's an old Carlo Pesci backhoe made in Italy in 1970's. When I got it it was in very bad shape so I took it apart and fixed everything. On the end it's a good machine but waay too heavy and with a too small reach. I've sold it soon after this video. We speak Croatian language .

 

[traktorz]

I'm glad you guys like my project. I hope others will also decide to start their own projects. Some things can be made better when you do it yourself then if you buy it.
...
Also, I finished the kingpin, made a thread on one end of it and started welding the boom swing mechanism:

I guess many will follow with interest. I'm curious on the pin and bushings, and if you plan on using expander bolts somewhere? On our Chinese made backhoe (LW-7) some bushings start to show substantial wear despite being well greased.

Are you using MAG welding with Mison gas? What amperage setting you're normally using here?

 

[BFreaky]

I will use CX bushings, posted them in previous posts.
Yes, I use MIG and a gas mixture of Argon&CO2 . Here they call it Feromix or Crystal...

 

[scaredychicken]

I'm glad you guys like my project. I hope others will also decide to start their own projects. Some things can be made better when you do it yourself then if you buy it.
Since all the parts are getting pretty heavy, I had to make a little shop crane to be able to rotate and move them around... The crane is made out of scrap that I had lying around and it's not really finished yet. Also, I finished the kingpin, made a thread on one end of it and started welding the boom swing mechanism:

Apart from the great design and craftmanship, I love the fact that BFreaky just casually mentions that he "had to make a little shop crane..." - I love it ! BFreaky makes the tools, in order to make the equipment that is originally considered. Way to go BFreaky. Genius at work !!! I love the creativity and problem solving. ... yes, this one-off production backhoe is going to be a monster. :thumbsup:

... I'll need to purchase any tractor and equipment that I need however, as my creativity will remain solely with model railroading

 

[Renze]

I don't think that's him because under the comments they are speaking another language that could be soviet or vietnamese

Where do you think he comes from ? just because he writes English as good as you, doesnt mean he cant be bi- or trilingual like most averagely educated Europeans

Oh, and soviet is not a language. a whole bunch of languages are spoken in the former soviet union

 

[Kyle_in_Tex]

I think that BFreaky gets so much done because secretly, his wife or girlfriend helps him. Just kidding. Not sure how you get so much done. you have a great shop. Do you take in jobs from businesses or from the public?

 

[Kyle_in_Tex]

I speak English, enough Spanish to get me in trouble, and I can call my guinea hens with a Swahili dialect.

 

[BFreaky]

I think that BFreaky gets so much done because secretly, his wife or girlfriend helps him. Just kidding. Not sure how you get so much done. you have a great shop. Do you take in jobs from businesses or from the public?

yep, she's welding all night long while I sit, watch a game and drink lots of beers... but shhhhh! don't tell anyone hehe
No, the shop is used only for making my innovations

 

[KubotainNH]

When I found that youtube I checked out some other 820 videos including tractor against tractor. Looks like a good machine. One was towing around a log trailer with a log picking boom, dunno what you really call it. It had a telescoping arm for extra distance and folded up neatly. I thought the telescoping boom would be cool on your hoe.

 

[hawkeye08]

I speak American English, Canadian English (eh?), Australian English, and UK English. I can manage German English but sometimes struggle. I can read and write Jenglish (Japanese English) but have some trouble speaking it.