1:35 Bucket chain excavator Ertmer KB 1

[Bernhard]

And there's the support.

[Bernhard]

And this is how it is attached to the model

Bernhard

[finescalerr]

Disturbingly adequate. -- Russ

[Ray Dunakin]

Marvelous!

[Design-HSB]

Bernhard, if I see it that way, I might also like such a model. But such a bucket chain excavator unfortunately does not fit my "Klosterstollen".

[Bernhard]

Helmut,
I know the problem too. Recently found this video on the Internet:
https://www.youtube.com/watch?v=1RJfnk2S330
Since then I've been thinking about building such a beast. It doesn't fit to my other works either, but the modelling challenge would appeal to me.

[1-32]

Yes, those ore unloaders of the great lakes the operator's cabin were just above the jaws he rode the arm into the hold then back out -crazy. Your bucket excavator is looking great.
cheers

[Bernhard]

Now we come to one of the more sophisticated subassemblies: the bucket ladder.
It consists of three parts:

• The upper part, which is permanently mounted in the machine.
• The middle part, which is made up of three parts: two short headers and a long central part. This was obviously available in different lengths, because I have seen old photos of excavators that had a much shorter bucket ladder.
• The levelling piece with the chain wheels.

[Bernhard]

Let's start with the upper part.
It is important that the width of the chain guide at the bottom of the bucket ladder fits exactly, because the chain has only a few tenths of a millimeter of play.
The production is done in three steps:
1.) Solder a left and a right side frame.
2.) Connect the two side frames at the top with cross profiles.
3.) Attach the stiffeners.

[Bernhard]

First a soldering jig for the side frames is milled, this time into a Pertinax plate.

[Bernhard]

And these are the prepared parts for the whole upper part of the bucket ladder.

[Bernhard]

The two soldered side frames.

[Bernhard]

For step 2, another jig from Pertinax is milled, ...

[Bernhard]

... and soldered the cross profiles on this one.

[Bernhard]

The soldering jig is pulled out...