Westlake Publishing Forums

Convincing to say the least.  Realism to the minutest degree.

Stuart

Still crawling along. Slowly adding the detail to this side of the tractor. Spark plug wires are made from annealed brass wire.

For the manifold I first used Krylon grey primer shot in short bursts from about 12-18" away to create the texture. An old trick. Then Tamiya brown primer and then light aps of burnt Sienna oils, pigments and then wet Prismacolor Premier pencil dits. Worked with a wet wood toothpick. Kind of subjective, but very editable.

On another forum we did some dioramas that fitted onto a peanut butter lid. It was a lot of fun and a way to get unstuck.

I love these business card dioramas and the modular possibilities.

VERY VERY LOOKING NICE  another great job
Barney

@Russ
It always remains exciting - even if I wish I could get there faster... but as the saying goes: "the journey is the goal!" 

@Barney
Spending the whole day surrounded by wonderfully fragrant flowers isn't possible for all of us either ;-)

@Lawrence

QuoteThis worries me less than it used to. As I get older the balance between 100% accuracy and a completed (slightly imperfect) model is shifting towards the latter!

I can now empathize with that! Since I've retired, time is running out faster and faster... and I still have 15 more projects waiting to be continued - not to mention the things that have only been floating around in my head so far, which would also be great as models...

QuoteCould Google 'Berlin dock crane' as there are 2-3 there that maybe similar, though with fixed jibs as far as I can see.

The three harbor cranes in Berlin-Tempelhofer Hafen all have fixed jibs. Unfortunately, none of the cranes I have been able to photograph in recent years have been able to provide any information.


@Bernhard

QuoteIn the case of a loading crane, the loading and unloading points will rarely be on the same arc. In order to be able to approach different points, the crane must therefore have an adjustable jib or be movable.
As the Münzel crane was stationary, it is probable that the jib could be adjusted, as otherwise the freighters would have had to be moved several times to unload. A motorized drive seems likely to me, because manual adjustment would probably have taken too long.
But these are just guesses, because it is not really possible to tell anything precise from the available photos.

We can probably agree that the boom of the Münzel crane was electrically adjusted in the later version.

Münzel-Kran (LEA) 02 (fspg2)

Münzel crane_Lauenburg (Copyright W.Hinsch-LEA)
Photo taken at the end of the 1950s

The boom had to be constantly adjusted when loading sand from several adjacent ships to the storage areas or hoppers on the quay. I can still clearly remember the noises when we children played on the piles of sand, much to the annoyance of the "master" (crane operator). Unfortunately, I didn't take any photos back then

Even if I am attracted by the cable control, the functional safety in the model will be safer with a drive rod from the driver's cab upwards through the roof (with electric motor in the crane cab).


Getriebegehäuse Kippachse Montage 02 (fspg2)



A 2.0 mm drive shaft is guided upwards through the roof in a 2.5/2.0 mm protective tube and ends in a housing similar to a letterbox. Two 90° bevel gears (module 0.4) lead laterally out of the housing - also through a 2.5 mm protective tube - directly onto the axis of the worm. The ball bearings have only been considered so far and will be embedded accordingly.
The next thing to do is to draw the stator,... must be drawn.

Today I continued with the front eyelet of the threaded rod.

Gewindestange mit Öse + Schutzrohr 01 (fspg2)



The two yellow 3.5/3.0 mm protective tubes are firmly connected to the movable gearbox. The threaded rod is soldered to the front connecting eyelet and another 4.0/3.5 mm protective tube is soldered to above it. This allows the protective tube coming from the gearbox to slide back and forth inside.


Gewindestange mit Öse + Schutzrohr 02 (fspg2)


Gewindestange mit Öse + Schutzrohr 03 (fspg2)



The connecting eyelet was milled from 2.0 mm MS58 as a double half-shell.
I milled the plate from both sides. The four outer 2.0mm holes were used for precise positioning of the second side. The panel was fixed with small screws through the two middle 3.0 mm holes during milling. Double-sided adhesive foil and a retaining bar at the rear end provided further security.

Gewindestange mit Öse + Schutzrohr 04 (fspg2)



Pre-tinned on one side, the two halves were fixed and connected to the flame. I was then able to remove the 4.0 mm round silver steel rod with a rubber mallet.

Gewindestange mit Öse + Schutzrohr 05 (fspg2)



Then I used a four-jaw chuck on the Emco Unimat 3 to round the remaining square to 3.5mm...

Gewindestange mit Öse + Schutzrohr 06 (fspg2)



... and cut it off.

Gewindestange mit Öse + Schutzrohr 07 (fspg2)


The threaded rod was turned down to 2.0 mm at the front end - so it fits into the 2.0 mm socket of the eyelet.

Gewindestange mit Öse + Schutzrohr 08 (fspg2)

Quote from: Bernhard on June 24, 2024, 03:01:43 AMIn the case of a loading crane, the loading and unloading points will rarely be on the same arc. In order to be able to approach different points, the crane must therefore have an adjustable jib or be movable.
As the Münzel crane was stationary, it is probable that the jib could be adjusted, as otherwise the freighters would have had to be moved several times to unload. A motorized drive seems likely to me, because manual adjustment would probably have taken too long.
But these are just guesses, because it is not really possible to tell anything precise from the available photos.

Bernhard

I totally agree.  I know a little bit about cranes as I did a course many years ago and had an operators certificate (only for a gantry crane, but you learn the general stuff anyway).

Looking at old cranes online (especially dock cranes) it is clear than many of these had fixed jibs. Presumably the limitations were overcome by moving the boat and the receiving vehicle.  I imagine the trade off was less convenience, but a significantly cheaper crane. A manually adjustable jib would be a little better at a little more cost.

The earlier photos of the Munzel crane seem to have very light gear for jib adjustment (if that is what it does). Worm drives are not particularly efficient, so if one were involved that would lower the liftable load even further. Probably "manually retractable jib" is what we see - converted to electric in later years?

The current proposal seems like it would be workable and still quite realistic.

Doug Junda and Bob Stears bought San Juan, Grandt Line, and some other companies. They are good guys and know their stuff. Mailing address: 8141 N I-70 Frontage Rd, Suite 5, Arvada, CO 80002. Phone: 303-284-5072. Website: https://sanjuandetails.com. -- Russ

     Back in the 1970s there was a company based in Summit, NJ, USA called San Juan Engineering.  It offered for sale a number of craftsman kits based on buildings and bridges from the Colorado narrow gauge country.  From a recent contact the name of the owner was Don Brown.
     I am trying to find information on what it made, when the kits were in production, and if possible copies of the plan sheet included with each kit.  Once I've acquired all I can find, I intend to send everything to the NMRA's library so that all have access to the files.  So far I have plan sheets from 6 of their kits and 2 advertisements in the model press, 1 from the company and 1 from a vendor offering a kit for sale.
     Any help from the forum in solving this mystery will be greatly appreciated. 

In the case of a loading crane, the loading and unloading points will rarely be on the same arc. In order to be able to approach different points, the crane must therefore have an adjustable jib or be movable.
As the Münzel crane was stationary, it is probable that the jib could be adjusted, as otherwise the freighters would have had to be moved several times to unload. A motorized drive seems likely to me, because manual adjustment would probably have taken too long.
But these are just guesses, because it is not really possible to tell anything precise from the available photos.

Bernhard

Thanks for whiling away an hour learning about cranes...

Quote from: fspg2 on June 22, 2024, 03:08:40 AMNow I'm curious to see if any of you can provide more detailed information about how the drive might have worked here

The classic modeller's conundrum.  At this point no real way to know how it was actually done.  Possible to infer or interpolate from available data and/or by analogy from other similar cranes (as you are doing).  Typically, once a decision has been made and metal cut, new information will arrive too late.

This worries me less than it used to. As I get older the balance between 100% accuracy and a completed (slightly imperfect) model is shifting towards the latter!

Whatever method is used to raise the jib (luffing?), the earlier arrangement particularly appears low load (and thus perhaps not used to lift the load, but to pre-set the jib position).  On that basis, my first question is does it need to work?  If the crane is doing repetitive tasks there may be no need to adjust the jib (in reality as well as in the model).

Are you sure the crane could luff?  Many cranes like this seem to have a fixed jib.  Your pics all seem to have the jib at the same angle.

If the original set up was a manual chain arrangement then it may not be possible to model this in working form and some artifice may be needed.



For what it's worth I found broadly similar cranes, but I don't think they help much: https://www.flickr.com/photos/90072739@N02/8431929337,

Could Google 'Berlin dock crane' as there are 2-3 there that maybe similar, though with fixed jibs as far as I can see.