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Offline Pfalzbahn  
#1 Posted : 08 October 2019 01:56:53(UTC)
Pfalzbahn

United States   
Joined: 05/10/2019(UTC)
Posts: 20
Location: Pennsylvania,
Recently my DKW lost power on the 2 points indicated with the red line.
Since the DKW is installed I would like to restore power to the 2 points by using a suitable electric conductive paint to connect them to the points indicated by the blue lines. I feel this should work since there is no possible contact to train wheels or ground.

I would appreciate your thoughts on this and possibly a suggestion which conduct paint to get.

Thanks,

Pfalzbahn

IMG_3131.jpg

Offline river6109  
#2 Posted : 08 October 2019 04:28:50(UTC)
river6109

Australia   
Joined: 22/01/2009(UTC)
Posts: 12,579
Location: On 1965 Märklin Boulevard just around from Roco Square
You always could try using a pair of pliers and raise the middle stud and are you sure its the middle stud and not the track itself
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Offline JohnjeanB  
#3 Posted : 08 October 2019 10:32:31(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 555
Location: Paris, France
Hi Pfalzbahn

Not willing to be too pessimistic but you have to remove the double slip switch and open it.
Conductive paint will not do: not enough conductivity and here this is the right spot to obtain short-circuits.
It is likely a short that caused the initial issue (the Puko is very close to the wheels)
Cheers
Jean
My lay-out videos
latest vid
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Offline hxmiesa  
#4 Posted : 08 October 2019 13:32:50(UTC)
hxmiesa

Spain   
Joined: 15/12/2005(UTC)
Posts: 2,726
Location: Spain
How do you know that the pukos doenst have power? -Did you use a multi-meter, or maybe a lamp with two wires? (Because if you say it just because the trains stalls in the middle of the track, then I wouldnt be so sure, and it is probably a short, as johnjeanb mentions ;-)
Best regards
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http://hoexbroe.tripod.com
Offline JohnjeanB  
#5 Posted : 08 October 2019 15:12:40(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 555
Location: Paris, France
Hi again Pfalzbahn

Looking more closely at your picture (making it much bigger) it seems very much that this is a dummy pucko aimed at raising the slider so that it does not touch the rails in the middle (look at the fixed frog pucko that seems to be made of insulating material) So you may have a slider issue and not a Double slip issue. Of course I may be wrong.
Cheers
Jean
My lay-out videos
latest vid
humping yard
Offline river6109  
#6 Posted : 08 October 2019 19:01:09(UTC)
river6109

Australia   
Joined: 22/01/2009(UTC)
Posts: 12,579
Location: On 1965 Märklin Boulevard just around from Roco Square
All pukos have power or should have power, there are no dummies. I still think its the track and not the pukos
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5 years in Destruction mode
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Offline applor  
#7 Posted : 10 October 2019 00:36:17(UTC)
applor

Australia   
Joined: 21/05/2004(UTC)
Posts: 1,394
Location: Brisbane, Queensland
I also find it unlikely that those middle pukos are no longer electrically conductive.

It may seem they are not conductive when trains stop in the middle due to no power but it can be the slider/pickup - those sliders with the centre hole lose power when it reaches the puko and it drops into the hole LOL

Are all of your locomotives affected by loss of power? Do they have centre hole sliders?

No power on the wide DKW is also caused by loss of earth on small locos, often dependant on the direction.


Originally Posted by: river6109 Go to Quoted Post
All pukos have power or should have power, there are no dummies. I still think its the track and not the pukos


Actually on the K track switches there is a couple of dummy pukos where the rails are connected by earth.
The sleeper with the dummy puko has metal in it to join the two rails electrically, so you cannot have an (active) puko in the middle of the sleeper.
modelling 1954 Germany (era IIIa)
Offline JohnjeanB  
#8 Posted : 10 October 2019 23:28:00(UTC)
JohnjeanB

France   
Joined: 04/02/2011(UTC)
Posts: 555
Location: Paris, France
Hi Pfaltzbahn



I found this thread on Stummi Forum about the 2275 DKW (double slip point) -->https://www.stummiforum.de/viewtopic.php?t=105938 Look at it slightly past half way. It dates back 2014.
At the time it was found to cause almost always shorts. The solution was to increase the Wheel spacing to 14.1 mm and to add some paint on the side of the pucko to avoid shorts with passing wheels.

I know it is not exactly your problem BUT
- Either Märklin has changed their 2275 to have a dummy pucko there (I don"t know, would they continue to deliver non operative units?)
- Or the Pucko is left unchanged and in this case it is made of thick stamped and bent metal (surface treated iron) on which there is almost no chance that anything can stop the pucko to bring power.
So please check again your unit. Thanks
Cheers

Jean
My lay-out videos
latest vid
humping yard
Offline Minok  
#9 Posted : 10 October 2019 23:52:27(UTC)
Minok

United States   
Joined: 15/10/2006(UTC)
Posts: 2,049
Location: Washington, Pacific Northwest
I would warn against using conductive paint. Assuming the issue is indeed that something under the track has broken connectivity to there (which I see is still a discussion point and I'm not addressing)....

You would be pushing some current through there, and getting the paint on thick enough that you don't have substantial resistance which could heat up the painted area. Conductive paint for higher current loads, if the paint is normal paint thickness, is a fire hazard risk source.
Toys of tin and wood rule!
---
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Offline Pfalzbahn  
#10 Posted : 11 October 2019 02:16:07(UTC)
Pfalzbahn

United States   
Joined: 05/10/2019(UTC)
Posts: 20
Location: Pennsylvania,
Thanks everybody for your thoughts.

The 2 pukos in question are powered at all my other DKW's! I experience the loss of power with all my engines.
Probably I have to take the DKW out and open it up to see what's wrong.

Pfalzbahn
thanks 1 user liked this useful post by Pfalzbahn
Offline river6109  
#11 Posted : 11 October 2019 08:41:11(UTC)
river6109

Australia   
Joined: 22/01/2009(UTC)
Posts: 12,579
Location: On 1965 Märklin Boulevard just around from Roco Square
Originally Posted by: Pfalzbahn Go to Quoted Post
Thanks everybody for your thoughts.

The 2 pukos in question are powered at all my other DKW's! I experience the loss of power with all my engines.
Probably I have to take the DKW out and open it up to see what's wrong.

Pfalzbahn


I've had similar problems with these turnouts until I've used a screwdriver and found out where the dead spot was, its been a long time since than but I remember it was the track and not the puko unless as I've mentioned before the puko is no longer high enough to have any contact with the slider.
to get shorts it was most the time the 2 pukos in the middle of the turnout have to be snug against the plastic part otherwise a wheel could have contact with it and shortens the loco.
you will find there is nothing visible you can put finger on it so a thorough manual investigation has to be undertaken.,

John

https://www.youtube.com/river6109
https://www.youtube.com/6109river
5 years in Destruction mode
50 years in Repairing mode
Offline Pfalzbahn  
#12 Posted : 16 October 2019 00:26:30(UTC)
Pfalzbahn

United States   
Joined: 05/10/2019(UTC)
Posts: 20
Location: Pennsylvania,
John,

the 2 pukos in question are dead, they have no current contrary to those pukos in my other DKW!

Pfalzbahn
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