Westlake Publishing Forums

Incroyable! - Russ

Here comes the next Pertinax gauge.

Demag_ML15_Montage_62 (fspg2)



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It makes the assembly of the small items much easier, especially as it should be several identical elements.


[Demag_ML15_Montage_64 (fspg2)



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It is quite difficult to mount these small M0.6mm nuts on the screws. The Allen wrench does not always help, because the nuts are turning part way sometimes.
But with patience, a headband loupe and a pointed tweezers, after soldering, all the pieces were sitting.

A pleasure to follow your progress with these fantastic models.

One question: Where do you buy your miniature screws and rivets?

@Hauk

There are different suppliers:

A)
https://ghw-modellbau.de/index.php?language=en

semicircular-rivet brass, finely twisted:
https://ghw-modellbau.de/index.php?language=en
These rivets have a small pimple on the head from turning on the machine unfortunately.

model flat-heat screws GHW 4000:
https://ghw-modellbau.de/index.php?cPath=4_5_7_103

B)
https://knupfer.info/shop/
Somewhat expensive but very precisely made screws and rivets! The heads of the rivets are really semicircular.

C)
https://en.fechtner-modellbau.de/material/mechanik/modellbau-schrauben/?p=1
In Norwegian: https://no.fechtner-modellbau.de/material/mechanik/modellbau-schrauben/


D)
The company Nolte in Germany manufactures wonderful screws and rivets.
Adress: http://www.geocities.ws/sven1n32/gr/modelling32/modelling32.html

Unfortunately no web page - only by letter, telephone or fax.
After payment in advance, the delivery of the first-class goods takes place.
Prices can be seen on the following three links. They are not completely up-to-date, but they can serve as orientation.

http://www.buntbahn.de/fotos/showphoto.php?photo=102334&size=big&password=&sort=7&thecat=9189
http://www.buntbahn.de/fotos/showphoto.php?photo=102335&size=big&password=&sort=7&thecat=9189
http://www.buntbahn.de/fotos/showphoto.php?photo=102336&size=big&password=&sort=7&thecat=9189




It continues with the roof for the Demag ML15.

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Just as with the bonnet, I milled a Pertinax gauge to bend the 0.2mm thick roof.

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Before the roof was milled out, I drilled 0.5mm holes on both long sides. Later they will pick up the rivets for the roof attachment.
The two sides are 12mm longer (cyan colored) to better bend the roof.


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The bending gauge has corresponding 0.5mm holes. In order to position the sheet in the middle, the small rivets (in the red circle) helps.


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Previously, I had annealed the sheet metal at the bending points with the flame.

In another lesson, the nickel silver sheet was pressed to the final shape.


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The protruding ends were then separated with the sheet metal cutting machine (similar to here)...

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... and already easily putted on the locomotive - it seems to fit.

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The quality and the precision leaves me speechless
Barney

Adequate. -- Russ

Quote from: Barney on April 28, 2019, 10:26:57 AM
The quality and the precision leaves me speechless

Ditto!

You should not be speechless, but only stimulated a little bit!

When assembling the small M0.6-mm screws (wrench size 1.0 mm), it proved difficult to fix the screw heads on the opposite side when mounting the nuts. First attempts with a small piece of wood to fix the screw heads were not very helpful.

So I need an open-end wrench!

It was not long sought, but briefly drawn:


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... and the wrench was milled out of 0.8 mm nickel-silver sheet metal.

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Now one side fits on the 1.0mm nuts, the other side has a key width of 1.3mm.


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Especially in places where there is no place enough for the socket wrench, it will help!


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That is just NOT FAIR! You are cheating by manufacturing special tools to create your incredible models. Go stand in the corner! -- Russ

Simply amazing!

The DEMAG ML15 should learn to walk soon. So far, only the "shoes" are drawn.

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From the cab side gives a clear insight into the engine area.

Fortuna_2018_004 (fspg2)

Copyright:: Achim Kuhlmann


Fortuna_2018_006 (fspg2)

Copyright:: Achim Kuhlmann


At least the front and back of the engine block should be simulated as a dummy and conceal the Faulhaber engine.

As a side view I will use this sketch !
A few views of the original motorblock you can see at Buntbahnforum .

Now will try to derive from it all the necessary details - let's see if it succeeds.


Demag_ML15_Montage_88 (fspg2)

Yes, let's see if it succeeds. My guess: It will. -- Russ

Russ, may be you are right!

For the Demag ML15 I need two motors - one for driving the locomotive and a second for the constantly rotating flywheel.

The drive is constructed similar to my Gmeinder 10-12. However, here is no toothed belt, but gears will be used.

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First of all, I interviewed the data sheet for the little Faulhaber motor 1512 and calculated the three model speed levels of 5.5km/h, 9.5km/h and 13.5km/h in an Excel spreadsheet.


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The already small space in the locomotive allows only very narrow gears and small engines.

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The gear unit has the following dimensions: height = 27.0mm, width = 20.0mm and depth = 4.0mm.

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The second gear for the flywheel now has a depth of 4.7mm available .... enough space!

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Now a few comments on the gears:

The gear ratio is about 2: 1.
The gears will have module 0.5.
The gear on the lower drive shaft has about twice as many teeth as the drive gear on the motor shaft.
In order to fit into the given space, I decided to use the following gear arrangement: 9 theeth – 9 teeth – 19 teeth.

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A few formulas for calculating the center distances:


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No matter how many teeth the middle gear has, for the gear ratio of gears only the two outer gears have to be considered: 19/9 = 2,11. The middle gear only bridges the distance between the two motor and drive axles.

The gears are ordered - let's see if they fit as well as I think. 

I have developed a terrible inferiority complex after reading today's posts. The engineering and fabrication are most satisfactory. -- Russ

Quote from: fspg2 on September 22, 2019, 10:12:57 AM

First of all, I interviewed the data sheet for the little Faulhaber motor 1512 and calculated the three model speed levels of 5.5km/h, 9.5km/h and 13.5km/h in an Excel spreadsheet.

Interesting choice of motor!

I am planning to use a couple of those motors for some of my own projects, but I am a bit concerened about their power.

So it would be interesting to know if you have done any calculations on the pulling power of your engine.  And have you estimated the weight of your model?