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Offline carlostau  
#1 Posted : 02 September 2020 22:53:12(UTC)
carlostau

Argentina   
Joined: 11/07/2020(UTC)
Posts: 19
Location: Buenos Aires, Castelar
Hi All.
I have been tinkering with the old 7051 crane. So far I have developed a simple joystick control with arduino to rotate the crane and lift the hook, but I wanted to know if anyone has developed some mod for the boom so it can also be controlled.
I did a search but could not find anything specific.
This is an analog layout with the classic 20v crane.
Thanks!
Offline hxmiesa  
#2 Posted : 02 September 2020 23:53:18(UTC)
hxmiesa

Spain   
Joined: 15/12/2005(UTC)
Posts: 3,066
Location: Spain
Originally Posted by: carlostau Go to Quoted Post
Hi All.
I have been tinkering with the old 7051 crane. So far I have developed a simple joystick control with arduino to rotate the crane and lift the hook, but I wanted to know if anyone has developed some mod for the boom so it can also be controlled.
I did a search but could not find anything specific.
This is an analog layout with the classic 20v crane.
Thanks!

Speaking off the top of my memory, I am pretty sure I have seen such an article in an OLD issue of Märklin Magazine!
I can try to look for it, but I have so many of them, that there aren't any guarantee...
Mechanically it was quite complicated, using a lot of gears and axles. (you will need another crane as donator...)
Best regards
Henrik Hoexbroe ("The Dane In Spain")
http://hoexbroe.tripod.com
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Offline carlostau  
#3 Posted : 19 September 2020 00:32:18(UTC)
carlostau

Argentina   
Joined: 11/07/2020(UTC)
Posts: 19
Location: Buenos Aires, Castelar
Originally Posted by: hxmiesa Go to Quoted Post
Originally Posted by: carlostau Go to Quoted Post
Hi All.
I have been tinkering with the old 7051 crane. So far I have developed a simple joystick control with arduino to rotate the crane and lift the hook, but I wanted to know if anyone has developed some mod for the boom so it can also be controlled.
I did a search but could not find anything specific.
This is an analog layout with the classic 20v crane.
Thanks!

Speaking off the top of my memory, I am pretty sure I have seen such an article in an OLD issue of Märklin Magazine!
I can try to look for it, but I have so many of them, that there aren't any guarantee...
Mechanically it was quite complicated, using a lot of gears and axles. (you will need another crane as donator...)



Thanks. Yes, it is quite complicated. Since mi crane operates within a 120 degree radius, I think I will use a servo or a dc motor to operate the angle.

thanks 1 user liked this useful post by carlostau
Offline Bigdaddynz  
#4 Posted : 19 September 2020 06:58:34(UTC)
Bigdaddynz

New Zealand   
Joined: 17/09/2006(UTC)
Posts: 17,462
Location: New Zealand
This is how it is done with the Marklin Metall version of this crane....

The spiral gear drives the round brass gear wheel which is attached to the large blue wheel. The blue wheel has a long axle attached to it which when wound forwards lowers the boom and when wound backwards raise the boom. Maybe you could swipe some Marklin Metall parts for your conversion, but they may be a bit too large for the 7051 crane.

Hope this is of use.

Crane1.JPG

Crane2.JPG

At the point where the axle is joined to the boom, there is a swivel joint to allow for moment.
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Offline JohnjeanB  
#5 Posted : 19 September 2020 10:34:57(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 1,143
Location: Paris, France
Hi Carlos
Here is my 7051 inside
7051-IMG_3972.JPG
I have not done the change but IMO you need to:
- modify the wiring and install a decoder in the crane (to bring digital signal in the cabin instead of the hook & light
- install a small whinch using a tiny DC motor & gears like this one
micromoteur.jpg
It sells for less than 4 € in places like this https://www.ebay.de/itm/GA12-N20...6fa3452eb1c8fff51816c2b0
It is 34 mm long and weights 12 g.
I think it is an interesting project
Jean
My lay-out videos
latest vid
humping yard
thanks 4 users liked this useful post by JohnjeanB
Offline JohnjeanB  
#6 Posted : 19 September 2020 12:10:15(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 1,143
Location: Paris, France
Hi
If you are reluctant having a decoder inside the crane cabin, you may try adding a conducting ring (and also add an additional slider in the cabin) to drive the motor with a separate supply
Here is the tower top where a new conducting ring needs to be added

7051-IMG_3973.JPG

Cheers
Jean
My lay-out videos
latest vid
humping yard
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Offline carlostau  
#7 Posted : 19 September 2020 12:36:43(UTC)
carlostau

Argentina   
Joined: 11/07/2020(UTC)
Posts: 19
Location: Buenos Aires, Castelar
Hi Jean, thanks for your input.
I did consider the motor with the reductor you mention.. it could fit. My circuit is analog so there is no need for a decoder.
One option to avoid installing the ring is to:
Use an arduino nano powered from the magnet / lamp pin (this needs a rectifier bridge and cap)
Add a nRF24L01 RF Module to make this wireless and receive the data from another arduino with the nRF24L01 RF Module.

In my case since the crane only moves within a radius od about 120 degrees total, I think I can live with the wires hanging on the side and have the control wired directly
Offline JohnjeanB  
#8 Posted : 19 September 2020 14:05:26(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 1,143
Location: Paris, France
Good for you
Is anything impossible with Arduino?
Jean
My lay-out videos
latest vid
humping yard
Offline Crazy Harry  
#9 Posted : 19 September 2020 20:49:24(UTC)
Crazy Harry

Canada   
Joined: 18/11/2008(UTC)
Posts: 371
Location: Oakville, Ontario
I searched the topic of remotely raising and lowering the 7051 crane boom a while ago and found the following links (they are in German):

This one seems more elegant
Crane Boom Motorization

This one is more complicated and mounts the motor on top of the boom's counterweight
Crane Boom Lowering and Raising

I haven't tried either method and may never modify my crane other than using a joystick to operate it.

Harold.
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Offline carlostau  
#10 Posted : 20 September 2020 04:15:25(UTC)
carlostau

Argentina   
Joined: 11/07/2020(UTC)
Posts: 19
Location: Buenos Aires, Castelar
Originally Posted by: Crazy Harry Go to Quoted Post
I searched the topic of remotely raising and lowering the 7051 crane boom a while ago and found the following links (they are in German):

This one seems more elegant
Crane Boom Motorization

This one is more complicated and mounts the motor on top of the boom's counterweight
Crane Boom Lowering and Raising

I haven't tried either method and may never modify my crane other than using a joystick to operate it.

Harold.


Thanks a lot. So far I have used a servo to move the boom. Works as expected with its inherent limitations. I am trying the dc motor next which should allow me to move the boom in a more precise way.
I will keep you posted.
Thanks
Offline Purellum  
#11 Posted : 20 September 2020 11:05:29(UTC)
Purellum

Denmark   
Joined: 08/11/2005(UTC)
Posts: 3,247
Location: Mullerup, 4200 Slagelse
Cool

Next step is this:





Per.

Cool

If you can dream it, you can do it!

I, the copyright holder of this work, hereby release it into the public domain. This applies worldwide.

In case this is not legally possible:
I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

UserPostedImage
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