American 7260 crawler crane

[D8R]

That´s one fantastic model you have made. Realy liked to see the other pics on your home page. Hard to belive it´s a model! 5 stars!
Dan

[eef7260]

Hello everybody
Thanks again for your reply's and nice comments.

tracksntreadslou asked : How much will it lift?
Well here is the answer.

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.

SmallHaul : there are a few small videos on my website.

W900snowman : yes the pads are from steel i will post some about it in one of the next posts.

OK now about the boom.
Boom is made from 6mm steel hydraulic tube and 2.5mm welding steel.
It's cheap and strong , 90% of the connections are done with copper welding.
The rest of the connections are done with silver solder.
Reason for this is that sometimes there are to many connections close to each other.
If you heat up one place the other one is falling apart again.
Silver solder is a bit lower in temperature so i used this on the difficult spots.
Result of this it's extremely strong , but it's not that simple.
It's extremely difficult because of all the tension you will bring in with these temperature.
So be warned it can drive you nuts if you will give it a try.
Afterwards file of the spots with to much solder ( or some rough sandpaper).
And then sand or glass blasting the whole thing and that's it.
The photos will tell the rest of the story.


next post : about the other cranes from the show , and about the tracks.

Eef