American 7260 crawler crane

[D8R]

Very nice tracks, was parts laser cut? How did you manage to have all parts lined up while brazing? I had to spotweld my parts together before they where brazed in owen.
Do you have any pic from this assembly work?
Very nice model!
Dan

[eef7260]

Hi lorenzo

Yep sorry missed that one.
My English is not perfect so excuse me for that but is this the socket you are talking about.
Just to make sure i am not telling you a whole story about the wrong piece.
So let me know are we talking about this piece ??

Dan , no everything was was made by milling.
I try to find to soldering mold and take a picture in the next few days.
Spot welding sounds like a good id too.
PS that is one big serious bulldozer you are building there.
Looks real good and impressive so far.


Tamiya Cowboy : have a look halfway the first page hope that answers your question.
100 US tons = 90 metric tons = 90000 kg divided by 15 to the third power = 26,5 kg maximum lifting capacity.
With the shortest boom configuration at 83°.
Thats been tested and it passed the maximum load test successfully.

Eef

[lorenzo]

Hello Eef,

Yes, that's the part I meant. If German is easier for you than try this way.

[eef7260]

Hi Lorenzo

I made the basic shape by milling ( see figure 1 & 2 )
It's not an real socket with an key , sorry it's a bit fake.
I made 2 holes ( see figure 3 )
I put the rope trough one hole then make a not and then stick it up again trough the other hole.
After the milling i made all the round edges with a file and sand paper.
It's not the most easy part to made but it can also be done with a saw and a drill and a lot patience and some skills with a file and sandpaper.
Hope this made some sense.

Eef

[lorenzo]

Thank you Eef. That makes sense. Interesting way you did it.

[eef7260]

Hi Guys

A few people asked for some more pics off the building stage.
Well thanks to this nice forum i found some inspiration again.
So i decided to work on the orange peel grab and make some parts for it.
The most difficult parts are done but a lot of small parts have to be made.
Like shave house and shaves from the top and bottom flange and the top hoist eye.
This is the current state at this moment.



And this is the shave house and shaves from the top and bottom flange and the top hoist eye that need to be made.









Programming some parts in the cad program to upload them to an wire edm machine.
A wire edm machine is a beautiful machine for model building.
It's an expensive machine so it's not accessible for most of us but my boss got a few that i can use after work time.
Al these parts can be made with other methods as well but this makes it much easier and faster.
I made a lot of parts in the past the conventional way but now i am lucky enough to have access to these machines.



Program uploaded to the machine.



Machine while cutting the parts.



Left over material.



And the result.





And these are all the parts needed for the shave house and shaves from the top and botom flange and the top hoist eye.



The bottom flange with shave house soldered together with silver solder and the shaves assembled.



The next step is the soldering of the top flange with the shave house and the hoist eye.
Hope you enjoyed it so far.

Eef