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Transfer idea for Marklin crane.
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Offline ixldoc  
#1 Posted : 17 May 2018 06:47:05(UTC)
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ixldoc

Australia   
Joined: 18/11/2015(UTC)
Posts: 220
Location: Brisbane,Australia
In 2009 a German gent posted a working transfer idea for a Marklin crane on Utube but his description of the mechanism was obscure.
I suspect it involved a belt under the layout but I could be wrong.It worked well and I vowed to make one. ( 9 years ago)!)
I recently saw a linear screw slide on eBay and realised it would be a good mech to use. I chose a 300mm one.
It was supplied with a large NEMA 42 stepper motor which I replaced with a Canon gear motor from a redundant ECG (EKG) machine.
An end bearing and a reduction shaft was needed to couple up with the lead screw.

The trick was how to get the power up to the moving crane. A rear concertina cable mounted on a support cable as is seen in the real thing wouldn't work in HO scale.
A flat ribbon cable which unfolded and folded I felt would fatigue and looked a bit naff.
The solution was to use a piece of PC board milled to form six contact strips and to collect the current with six Marklin carbon brushes.
A micro switch was added each end to prevent overrun. The control box uses two joysticks for transfer and crane functions.
The magnet control only requires a momentary push as it is interfaced with a latching relay.

Some photos of the construction ( not too many I hope!).

Crane 1.jpgCrane 2.jpgCrane 6.jpgCrane 12.jpgCrane 9.jpgCrane 7.jpg



Crane 13.jpgCrane 14.jpgCrane 19.jpgCrane 16.jpg

The flat connectors on the transfer base connect to the Marklin crane wires and sit nicely under the crane base plate.
I built it in a display case with perspex sides as I didn't want to place it in my layout.
It would be easy to support it under a layout and use the baseboard as the transfer table ( with suitable 5mm slot ).
A short video.

Edited by moderator 18 May 2018 19:41:36(UTC)  | Reason: Updated YT link
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Offline Danlake  
#2 Posted : 17 May 2018 09:40:11(UTC)
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Danlake

New Zealand   
Joined: 03/08/2011(UTC)
Posts: 1,571
That’s brilliant!

And beautiful craftsmanship ThumpUp

For some reason I can’t stream video, but will check later.

Best Regards
Lasse
Digital 11m2 layout / C (M&K) tracks / Era IV / CS3 60226 / Train Controller Gold 9 with 4D sound. Mainly Danish and German Locomotives.
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Offline ixldoc  
#3 Posted : 17 May 2018 10:32:18(UTC)
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ixldoc

Australia   
Joined: 18/11/2015(UTC)
Posts: 220
Location: Brisbane,Australia
Thanks Lasse. If anyone else has trouble with the video let me know and I will upload it again.
Howard.
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Offline PJMärklin  
#4 Posted : 17 May 2018 10:51:06(UTC)
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PJMärklin

Australia   
Joined: 04/12/2013(UTC)
Posts: 2,210
Location: Hobart, Australia
Hi Howard,

I am unable to run the video

Regards,

Philip
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Offline dominator  
#5 Posted : 17 May 2018 11:02:00(UTC)
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dominator

New Zealand   
Joined: 20/01/2015(UTC)
Posts: 1,196
Location: Kerikeri
Nor am I. looks good though

Dereck
Northland. NZ REMEMBER 0228 for ä
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Offline ixldoc  
#6 Posted : 17 May 2018 11:10:11(UTC)
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ixldoc

Australia   
Joined: 18/11/2015(UTC)
Posts: 220
Location: Brisbane,Australia
OK thanks will reload onto Utube and repost.
Howard.
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Offline ixldoc  
#7 Posted : 17 May 2018 12:08:46(UTC)
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ixldoc

Australia   
Joined: 18/11/2015(UTC)
Posts: 220
Location: Brisbane,Australia
Try again. I tried to reload the original video but Utube wouldn't allow it so I had to make another as I have no video editing software!
Here goes:
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Online analogmike  
#8 Posted : 17 May 2018 14:20:07(UTC)
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analogmike

United States   
Joined: 02/08/2014(UTC)
Posts: 740
Location: NEW JERSEY, USA
Very, Very nice. I love it!
Mikey
I love the smell of smoke fluid in the morning .
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Offline Ross  
#9 Posted : 18 May 2018 00:21:21(UTC)
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Ross

Australia   
Joined: 25/09/2006(UTC)
Posts: 872
Location: Sydney, NSW
Hi Howard,

That's a nice engineering solution for great crane control, well done.
Ross
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Offline ShannonN  
#10 Posted : 18 May 2018 00:44:17(UTC)
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ShannonN

Australia   
Joined: 14/08/2016(UTC)
Posts: 492
Location: Maryborough, Qld
Very well done, control unit looks very professional
same motive power could be used for making your own transfer table perhaps?

seen something smaller using a A3 printer slide and printhead assembly for a transfer table once

Lets see it in action with trains please
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Offline dominator  
#11 Posted : 18 May 2018 04:59:15(UTC)
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dominator

New Zealand   
Joined: 20/01/2015(UTC)
Posts: 1,196
Location: Kerikeri
Thats a really nice setup Howard,. congratulations.
Dereck
Northland. NZ REMEMBER 0228 for ä
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Offline ixldoc  
#12 Posted : 18 May 2018 06:48:00(UTC)
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ixldoc

Australia   
Joined: 18/11/2015(UTC)
Posts: 220
Location: Brisbane,Australia
Hi ShannonN ( apologies for using nom de plume)
That is a very interesting article regarding the printer mechanics. The author faced the same problem as I did when I made a transfer table in 2016 ( posted on this site).
The indexing has to be very accurate for the tracks to line up exactly and in both directions of bridge movement.
He chose to use a solenoid peg and hole arrangement similar to the old Marklin turntable.
(The linear slide arrangement used here for the crane would work as it is a very rigid moving table with no chance of the bridge twisting.)

The difficulty as he mentioned is making sure the peg is retracted before the motor moves the bridge otherwise it jams.
Slow speed helps but I think the peg should also be slightly pointed and the hole countersunk a little.
I chose to use an electronic solution with a tight ( vertically collimated) IR beam under the bridge activating a matched phototransistor on the lateral wall at each track position.
This gave me 0.5mm accuracy which was tight enough for C track. Marklin wheelsets are also a bit forgiving.
I used a mini geared stepper motor to drive the bridge and this setup will stop on the dot when the power is interrupted.
I used the same IR /phototransistor arrangement when I converted the Marklin/Fleischmann turntable to remote control. ( posted Feb 16 as Marklin turntable project).

I will post a photo of another much smaller linear slide 30cm long which I feel could easily be adapted to a transfer table.

Regards,
Howard.
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Offline ixldoc  
#13 Posted : 18 May 2018 07:04:56(UTC)
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ixldoc

Australia   
Joined: 18/11/2015(UTC)
Posts: 220
Location: Brisbane,Australia
Hi again,
This is a much smaller linear slide with a ball bearing mounted table which I feel could be the basis for a transfer table.
30cm long with mounting holes in the table. Need to design a motive arrangement but that's the fun hey?

Linear slide 1.jpgLinear slide 2.jpg

Cheers,
Howard.
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