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Author Topic: 1:35 Bucket chain excavator Ertmer KB 1  (Read 23827 times)
Bernhard
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« Reply #15 on: November 03, 2019, 04:33:59 AM »

For a better overview, I already divided the excavator into 13 assemblies during the creation of the model. These were all detailed.


* KB1 003c.JPG (178.07 KB, 1147x884 - viewed 241 times.)

* KB1 003d.JPG (217.06 KB, 1414x881 - viewed 235 times.)
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Bernhard
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« Reply #16 on: November 03, 2019, 04:35:34 AM »

After the completion of all drawings, a look at the parts list shows that the excavator consists of over 1,100 individual parts!

Bernhard


* KB1 003e.JPG (143.88 KB, 1582x698 - viewed 251 times.)
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Hauk
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« Reply #17 on: November 03, 2019, 10:46:13 AM »

After the completion of all drawings, a look at the parts list shows that the excavator consists of over 1,100 individual parts!

Bernhard

Wow. Quite a challenge!
Have you decided what materials and techniques you are going to use in the model? From the drawings it looks that a lot of the parts could be photoetched.
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Regards, Hauk
--
”Yet for better or for worse we do love things that bear the marks of grime, soot, and weather, and we love the colors and the sheen that call to mind the past that made them”  -Junichiro Tanizaki

Remembrance Of Trains Past
finescalerr
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« Reply #18 on: November 03, 2019, 12:53:27 PM »

The drawing alone is terrific. -- Russ
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Franck Tavernier
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« Reply #19 on: November 03, 2019, 01:27:15 PM »

Very impressive Bernhard!

And the size in 1:35 scale will be impressive too!

Franck
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Ray Dunakin
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« Reply #20 on: November 04, 2019, 11:25:56 PM »

Wow! Great work on the 3D drawings.
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Visit my website to see pics of the rugged and rocky In-ko-pah Railroad!

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Barney
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« Reply #21 on: November 05, 2019, 04:07:06 PM »

Bucket thing on you tube   //www.youtube.com/watch?v=Iu00w9AJMJY
Barney
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Barney
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« Reply #22 on: November 05, 2019, 04:10:12 PM »

or even  https://www.youtube.com/watch?v=Iu00w9AJMJY
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Bernhard
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« Reply #23 on: November 06, 2019, 02:59:18 AM »

Hauk
The excavator is mainly constructed of angle- and U-profiles, flat iron and sheet metal. Everything is welded or screwed (no rivets!).
All the sheet metal parts are actually etched.
Although the construction looks very filigree, it is quite stable. This is also noticeable in the finished model assemblies.

Barney
Thanks for sharing the link. It shows a typical application of these excavators.

Bernhard
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Bernhard
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« Reply #24 on: November 06, 2019, 03:28:53 AM »

The model

The biggest challenge in the realization of the excavator are the buckets. These are only about 12 x 11 x 6.5 mm small, with a wall thickness of 0.2 mm.
That's why I took care of these parts first.

From a dozen photos …


* KB1 005.JPG (215.15 KB, 666x519 - viewed 219 times.)

* KB1 006.JPG (176.63 KB, 666x430 - viewed 235 times.)
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Bernhard
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« Reply #25 on: November 06, 2019, 03:29:25 AM »

… and a hand-drawn sketch ...


* KB1 007.JPG (53.84 KB, 625x864 - viewed 236 times.)
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Bernhard
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« Reply #26 on: November 06, 2019, 03:30:13 AM »

... one of our young designers created a 3D scale model for me.


* KB1 008.JPG (107.54 KB, 1519x863 - viewed 237 times.)

* KB1 009.JPG (55.2 KB, 1359x422 - viewed 232 times.)
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Bernhard
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« Reply #27 on: November 06, 2019, 03:31:14 AM »

The first idea was to have the buckets produced as a 3D printed part. However, this failed because of the minimum wall thickness of 0.4 mm for such parts. That would have been optically wrong.
That's why I explored the possibilities of casting the part. After a long unsuccessful search, I came across a possible supplier at a model building fair in autumn 2018. After a short examination, the owner immediately said that this would not be a problem. He could even cast the parts in nickel silver. He cast me a sample part within two weeks, and behold:


* KB1 010.JPG (191.04 KB, 808x559 - viewed 226 times.)

* KB1 011.JPG (197.66 KB, 751x569 - viewed 241 times.)
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Bernhard
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« Reply #28 on: November 06, 2019, 03:32:00 AM »

All I can say is I was thrilled! Realized down to the last detail, true to size and stable. If the paint is scraped or scratched by use, no yellow brass shines through. Although the offer of CHF 16.00 per piece (with a requirement of 16 pcs.) was not a bargain, it was definitely worth its price.
I thought this solved the problem, ordered the missing 15 buckets and turned to the first assembly of the excavator.
But then, after a longer waiting time, the big disappointment: the supplier did not answer any more to my questions about the delivery date. The company was apparently closed before he had delivered the missing parts to me.
Since then I have searched unsuccessfully for an alternative supplier.

So now the urgent question to the Forum is: does anyone know of a fine casters in Switzerland, Germany or anywhere in Europe who could cast these parts?

Bernhard
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Peter_T1958
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« Reply #29 on: November 07, 2019, 02:40:54 AM »

Hi Bernhard

Take a look here:

http://www.brogioli-casting.ch/
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