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Author Topic: 1:35 Bucket chain excavator Ertmer KB 1  (Read 59573 times)
TRAINS1941
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« Reply #150 on: January 21, 2020, 08:03:28 AM »

I am so impressed, not only with this latest assembly but with the entire model so far, that I have no idea what to say. -- Russ

Now that's saying something!!  Wink

Looks beautiful.. Excellent workmanship.

Jerry
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Barney
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« Reply #151 on: January 23, 2020, 04:23:23 PM »

Lovely construction work - excellent in all ways
Barney
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Bernhard
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« Reply #152 on: January 30, 2020, 04:14:04 AM »

In between some good news: 15 months (!) after ordering I finally got the buckets! I am very pleased, but see for yourself.
And out of which material did the caster cast them now? From 925 silver!
His explanation: because of the low wall thickness of 0.2 mm the liquid metal solidifies very fast, before it can fill the whole mould. He was therefore forced to cast the parts on a precious metal casting machine where temperatures of up to 1'200 °C are reached.
Fortunately, the change of material has no major impact on the price. Only CHF 9 more on the whole order, but the parts are very light.
Quality and dimensional accuracy are impeccable. I only have to adjust the parts a little bit after the sprues have been cut off.
Now I'm waiting for the laser-cut chain plates, then nothing more stands in the way of completion

Bernhard


* IMG_5179.JPG (229.88 KB, 890x443 - viewed 348 times.)
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Hauk
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« Reply #153 on: January 30, 2020, 09:08:34 AM »

In between some good news: 15 months (!) after ordering I finally got the buckets! I am very pleased, but see for yourself.
And out of which material did the caster cast them now? From 925 silver!
His explanation: because of the low wall thickness of 0.2 mm the liquid metal solidifies very fast, before it can fill the whole mould. He was therefore forced to cast the parts on a precious metal casting machine where temperatures of up to 1'200 °C are reached.
Fortunately, the change of material has no major impact on the price. Only CHF 9 more on the whole order, but the parts are very light.
Quality and dimensional accuracy are impeccable. I only have to adjust the parts a little bit after the sprues have been cut off.
Now I'm waiting for the laser-cut chain plates, then nothing more stands in the way of completion

Bernhard

Insane! But the parts look great. How much in total did the parts set you back?

And how does paint adhere to silver?
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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
Bernhard
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« Reply #154 on: January 30, 2020, 10:56:51 AM »

Hi Hauk
For 21 buckets I finally paid CHF 340. That seems a lot in the first moment. But if you consider the work and the quality, the unit price is certainly justified. And exactly with these parts I did not want to save money. Bungled parts would definitely not fit to the excavator.
I don't want to paint the buckets because the paint is rubbed or scratched during operation. I first see if the silver tarnishes naturally. If necessary I try to chemically blacken it.
Bernhard
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finescalerr
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« Reply #155 on: January 30, 2020, 01:31:32 PM »

I think the parts are worth the price. Anything less might spoil the model. After all, if you were to place a value on the quality of your work and the time you have invested, the buckets would be inexpensive by comparison. -- Russ
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Lawton Maner
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« Reply #156 on: January 30, 2020, 03:18:35 PM »

There are a number of chemical blackening agents which can be used to color the silver.  Check with a company which specializes in supplying materials for the trade and for hobbyists who manufacture custom jewelry.
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Design-HSB
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« Reply #157 on: January 30, 2020, 04:18:59 PM »

Hello Bernhard,

please look here there is something to brown for silver.

Just great what you're doing.
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Regards Helmut
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Ray Dunakin
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« Reply #158 on: January 31, 2020, 01:12:34 AM »

Those turned out great!
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Hydrostat
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« Reply #159 on: January 31, 2020, 04:39:38 AM »

In between some good news: 15 months (!) after ordering I finally got the buckets! I am very pleased, but see for yourself.
And out of which material did the caster cast them now? From 925 silver!
His explanation: because of the low wall thickness of 0.2 mm the liquid metal solidifies very fast, before it can fill the whole mould. He was therefore forced to cast the parts on a precious metal casting machine where temperatures of up to 1'200 °C are reached.
Fortunately, the change of material has no major impact on the price. Only CHF 9 more on the whole order, but the parts are very light.
Quality and dimensional accuracy are impeccable. I only have to adjust the parts a little bit after the sprues have been cut off.
Now I'm waiting for the laser-cut chain plates, then nothing more stands in the way of completion

Bernhard

Outstanding. I've heard of tiny handles and so on being cast in silver for it's higher flowability. But this is just amazing. Congrats!
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I'll make it. If I have to fly the five feet like a birdie.

I'll fly it. I'll make it.
1-32
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Hi, I'm Kim.


« Reply #160 on: January 31, 2020, 05:55:02 PM »

I will definitely go along with the tone of all the comments.
cheers
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Bernhard
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« Reply #161 on: February 01, 2020, 09:33:35 AM »

Thanks for your interest and your advices.

But let's continue now with the middle section of the bucket ladder.


* KB1 114.JPG (77.72 KB, 778x792 - viewed 320 times.)
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Bernhard
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« Reply #162 on: February 01, 2020, 09:34:31 AM »

The procedure is basically the same as for the upper part.


* KB1 115.JPG (98.97 KB, 1232x803 - viewed 279 times.)

* KB1 116.JPG (97.79 KB, 1234x752 - viewed 321 times.)

* KB1 117.JPG (112.26 KB, 1235x769 - viewed 313 times.)
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Bernhard
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« Reply #163 on: February 01, 2020, 09:35:06 AM »

Once again, a jig is milled into a Pertinax plate...


* KB1 118.JPG (228.93 KB, 901x722 - viewed 344 times.)
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Bernhard
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« Reply #164 on: February 01, 2020, 09:35:39 AM »

… the necessary parts for the two side frames are prepared, ...


* KB1 119.JPG (227.91 KB, 992x422 - viewed 292 times.)
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