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Author Topic: KEMNA street roller in scale 1:22.5  (Read 12237 times)
fspg2
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« Reply #45 on: August 25, 2018, 01:16:09 AM »

With the roller it goes on only slowly.  

Two inner cover panels were merely milled from 3.0mm brass.

Kemna_Walze-Gigant-8_319 (fspg2)



Kemna_Walze-Gigant_8_267 (fspg2)



Slowly, the first printed small parts come in:

Kemna_Walze-Gigant-8_320 (fspg2)



Kemna_Walze-Gigant_8_157 (fspg2)


When comparing the last two pictures I noticed a mistake on my part ...grrr……



Well, the handle sits exactly on the opposite side - has happened.

Kemna_Walze-Gigant-8_324 (fspg2)




Kemna_Walze-Gigant-8_321 (fspg2)




Kemna_Walze-Gigant-8_322 (fspg2)



Kemna_Walze-Gigant-8_323 (fspg2)


Given this, and especially since I need two of these handwheels, I have again invested € 14.40 / per wheel for two raw brass lost-wax parts.

All parts I have previously ordered as raw came gold-shiny therefore free of extra charge.
The steps of the often quite coarse resolution (see the oblique connection on the small casting on picture 320) are usually not visible ... but the parts themselves are a little bit smaller - for example: the wheel diameter should be 17.8 mm ...

Kemna_Walze-Gigant-8_325 (fspg2)


...it has 17.45mm to 17.54mm - about 1.5% - 2.0% less.


According to information from another printer provider, the shrinkage behavior in lost wax casting is negligible.
Soon I will have a comparison, if I get from there new parts.


After 10 days I got the new handwheels.

Kemna_Walze-Gigant-8_333 (fspg2)


left: sandblasted new wheel, the levels of printing are no longer visible to the naked eye. To keep the wheel during sandblasting with the big gloves better, I have tied it to a 0.3mm wire.
middle: the unfinished second part
right: the old hand wheel with the toggle in the wrong position.

The rear "coupling u-pile" is also ready for installation:

Kemna_Walze-Gigant-8_332 (fspg2)



Kemna_Walze-Gigant_8_155 (fspg2)





For the numbers "1, 0, 2, 3" on the lever rack I used the font type "ROMAN D". Although "bold" has been activated, the four numbers appear extremely thin.


Kemna_Walze-Gigant-8_326 (fspg2)



Kemna_Walze-Gigant-8_327 (fspg2)



Kemna_Walze-Gigant-8_328 (fspg2)



Kemna_Walze-Gigant-8_329 (fspg2)



Kemna_Walze-Gigant-8_330 (fspg2)



Kemna_Walze-Gigant-8_331 (fspg2)




Volker helped with modified letters.

The result is a broader appearance of the only 0.9mm high numbers.

Kemna_Walze-Gigant-8_334 (fspg2)

on the left the original font - on the right the new modification.


Kemna_Walze-Gigant-8_335 (fspg2)


In a few days I will get the part in brass from wax-lost casting.

Kemna_Walze-Gigant-8_336 (fspg2)






Yesterday something strange came to light!


Kemna_Walze-Gigant-8_337 (fspg2)

...shit happens... :-)

It almost looks as if my router wanted to try as a 3D sausage printer.


It should be milled out from a 2.0mm brass plate only the bottom plate below the checker plates!


Kemna_Walze-Gigant_8_160 (fspg2)



Kemna_Walze-Gigant_8_161 (fspg2)



Kemna_Walze-Gigant-8_339 (fspg2)



Kemna_Walze-Gigant-8_340 (fspg2)



At second try it worked.

Kemna_Walze-Gigant-8_341 (fspg2)


« Last Edit: August 25, 2018, 03:15:52 AM by fspg2 » Logged

Frithjof
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« Reply #46 on: August 25, 2018, 12:08:02 PM »

Slow, steady, world class modeling. -- Russ
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Ray Dunakin
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« Reply #47 on: August 27, 2018, 08:24:14 PM »

Slow, steady, world class modeling. -- Russ

What Russ said!

Did you find out why the router went haywire?

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fspg2
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« Reply #48 on: August 28, 2018, 12:52:01 AM »

Incorrectly, I used a 1.2mm drill instead of a 1.2mm cutter. I only noticed it when the drill broke off.

I had drawn the coupling plank 0.6mm longer to counteract shrinkage during 3D printing.

It fits Smiley

Kemna_Walze-Gigant-8_343 (fspg2)



Kemna_Walze-Gigant-8_344 (fspg2)



Kemna_Walze-Gigant-8_345 (fspg2)



Kemna_Walze-Gigant-8_346 (fspg2)

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Frithjof
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« Reply #49 on: March 09, 2019, 02:40:14 PM »

I want to make the middle hood area of the roller foldable - like the prototype.

Montage_Blechhaube_Kemna_01 (fspg2)



My first idea was to solder an 1.2mm tube to the 0.2mm side panels and then clamp them into a jig, to mill the mutual gaps.

Here is the fear that the only 2.0mm long and 1.2mm in diameter tubes do not join the movement too long.
Also, the brazing of the thin parts is certainly not really accomplish, without that the sheet burns up or rejects.

So Volkers attempt was a little more convincing as he visited me recently.

On the web, I found two examples very similar - only much smaller: click and click.


Kemna_Haube_beweglich_01 (fspg2)



Kemna_Walze-Gigant-8_354 (fspg2)



Kemna_Walze-Gigant-8_353 (fspg2)



Meanwhile, a colleague at Buntbahn forum gave a good hint!
He asked if it would not have been easier at the prototype to weld something like a piano band under the sheets.

I had only a few partial views of the hinge from the Kemna Roller in Herborn.
After I had assembled them in Photoshop and downscaled to 800px for the forum, although I could count the number of hinge sections ... only accurate details were not really recognizable on the piebald surface.


So I have inspected the original images again, and lo and behold ....

The side parts had been riveted to the hinges.

Kemna_Walze-Gigant_8_358 (fspg2)



Kemna_Walze-Gigant_8_359 (fspg2)



Kemna_Walze-Gigant_8_360 (fspg2)



At the Buntbahnforum Henner showed his way to make hinges. Contribution from 2011/11/24: click.



Far more difficult will be the tiny beadings that are in the curve of the front hood cover!

On the web I could find some shots in the "naked" state:


found at: https://www.facebook.com/196382207916011/photos/pcb.242331009987797/242330756654489/?type=3&theater


Kemna_Walze-Gigant-8_355 (fspg2)



Kemna_Walze-Gigant-8_356 (fspg2)



Kemna_Walze-Gigant-8_357 (fspg2)


And then Peter showed his great solution with his depressed beadings.
Maybe you can set your picture here so everyone can see it?
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Frithjof
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« Reply #50 on: March 09, 2019, 03:06:36 PM »

I know you will create those details and I know they will look perfect.

But you're crazy.

Russ
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fspg2
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« Reply #51 on: March 10, 2019, 03:49:11 AM »

Sometimes it's fun to be a bit crazy Wink

On 2019/08/25 I wrote:

Quote
In a few days I will get the part in brass from wax-lost casting.

I forgot to report the result.

After my order was accepted in Brass-Raw (Professional plastic was immediately rejected because of too low material thickness), 3 days before the confirmed delivery date a rejection of Shapeways came: ... "too small wall thicknesses".

The order at another provider was delivered within one week.

After removing the still visible pressure levels from the lost-wax plot with a small sander and sandpaper file, the tiny numbers (letter height = 0.9mm, grandeur 0.2mm) were still readable.

Next time I will have the wax plot of such small objects created by another provider, Volker had very good experiences ... maybe a bit more expensive, but the rework should be minimized significantly.


Kemna_Walze-Gigant-8_348 (fspg2)



Kemna_Walze-Gigant-8_349 (fspg2)



The parallel delivered front hood rounding I sandblasted only.

Kemna_Walze-Gigant-8_347 (fspg2)
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Frithjof
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« Reply #52 on: March 10, 2019, 12:42:02 PM »



And then Peter showed his great solution with his depressed beadings.
Maybe you can set your picture here so everyone can see it?

By no means I want to hijack this thread - here the two pictures (front/rear).




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finescalerr
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« Reply #53 on: March 10, 2019, 02:08:50 PM »

Gentlemen, the parts each of you produced turned out superbly. -- Russ
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Ray Dunakin
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« Reply #54 on: March 21, 2019, 11:22:44 PM »

Wow!
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