Tractor backhoe - homemade

[4570Man]

Yours is the best one man fab job I’ve ever seen. I see excellent work at the metal fab shop all the time, but they had a welder, a machinist a parts cutter, and working from someone else drawings. To do it all yourself is more impressive.

 

[BFreaky]

Working...

Done

 

[Rustyiron]

You are my hero
Looking forward to following your project.

 

[Kyle_in_Tex]

What kind of steel is that? I see the chips coming off are blue.

The bluer the chips, typifies the harder the steel.

How did you measure to keep the center bore in the same datum of the 2 end pins?

I'm making some parts at work made from Hastelloy X. This is the material the Germans wish they had in WWII for their jet engines on the ME 262. It takes really high heat loads. Along with Inconel.

 

[BFreaky]

It's st52.3 J2+N construction steel. 2-nd picture shows the solution. First I finished the big hole for the cylinder and then aligned the surfaces to get a perfect square 50x50 mm. Then i just had to make an X on both of them and drilled a hole.

 

[Renze]

It's st52.3 J2+N construction steel.

You dont win when using a higher grade of steel. Once welded, the fatigue life of all steels is more or less the same, only the Charpy impact energy will determin how fast a microcrack will grow.

High strength steel is only beneficial when the amount of load cycles in use, are low. Telescopic crane booms are bent into two U shapes that are welded together, so the weld is in the neutral axis. With diggers the amount of load cycles per hour is much more, so theres no benefit in S690 or higher.

 

[BFreaky]

The machine will have hardened pins, replaceable bushings and every important part will have hardened steel such as Hardox cutting edges etc. General construction parts will be st 52.3 because it's just fine for this purpose. I was thinking about using Domex or Strenx on the boom sections but havent decided yet...

 

[sixdogs]

The quality, design and engineering of all this boggles the mind. What perfection.

 

[dragoneggs]

The quality, design and engineering of all this boggles the mind. What perfection.

Yeah I find myself doing projects like this late in the evening... then I wake up and realize I need to clean off my workbench in the morning and figure out what projects have been stalled and covered up with others. :laughing:

 

[BFreaky]

Made some cylinder rod ends...