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Modelling Prussian railways in H0
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allegheny1600



Joined: 19 Jun 2010
Posts: 104
Location: Warrington, UK

PostPosted: Mon Jun 18, 2018 5:47 pm    Post subject: Reply with quote

Carrying on with my wiring work, I took advantage of the nice weather and worked outside, under the gazebo as it was simply too hot in direct sunlight!



Here is the turntable board, again with a simple C shaped bus as that is sufficient for all the track feeds on this section. Almost out of shot is the first (Conrad) point motor that I installed.



Now fitting the point motors on the ‘busiest’ board. I think you can just see my pencil marks where I plotted the alignment of the point above then it was a simple case of lining the motor along these lines and getting the actuation lever in the right position and voila! Screw the motor into position and set the actuation wire, I always use the thicker wire supplied.



I knew that my micro switches would need elevating from the baseboard surface so I found a piece of strip wood that would just slip under the motor actuating lever and got them prepared.



Fitting the micro switches into position, all that was required was to ensure the point motor actuation lever was able to operate the micro switch arm. Curiously, I had some smaller switches in stock but these larger switches seemed to work better.



Having now done most of the physical work under the boards, it was now time to fit a full wiring bus. As this final board is quite busy, I made full loops all the way around the perimeter of the board. Here we have most of the track feeds in position, later I realised that I had missed a couple of track feeds when doing the droppers, despite drilling holes for them.



Just a close up of the above, you can actually see one of the holes where a track feed should go!



Looking a bit more complex now.
Most importantly, the Lenz LS150 accessory decoder is now fitted along with connections to all the points, including the point on an adjacent board and the micro switches are all fed from the bus and to the point crossing vee. My good friend Les, gave me some assistance with making the micro switch connections as all I could reliably do was the ‘common’ feed to the vee. Without Les’ help with identifying which of the red/black wires goes where on the micro switch, using an electrical tester, I would have spent ages trying first one way, then the other - I really am that electrically incompetent so “Thanks” to Les!
Also, the bus feed and inter-board connections are also fitted. I probably over engineered these as they are sections of heavy duty HiFi speaker cable soldered to both outputs of HiFi/video Phono plugs and sockets, red and black to correspond with the bus colours.



Nearly done now, thankfully.
I had no idea this job would take quite so long! Principally because I have never gone so far with a project such as this - all my previous layouts have either been simple power routing though the point or ready built.
If I had tried to wire a layout like this using traditional analogue methods, I would have been stumped as it would have been too much for me. Using a bus to provide two wires to each piece of track - that I can deal with!
I would say that I worked for an average of over six hours a day for ten days, doing this - I am sure that others, more experienced and who know what they are doing, would be much faster. But, I am satisfied with this and bar one minor adjustment to one point, everything worked first time.
Must be beginners luck!
Cheers,
John.
_________________
TTFN,
John E.

My club's 2018 exhibition:
http://forum.mtimag.co.uk/viewtopic.php?t=2150
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allegheny1600



Joined: 19 Jun 2010
Posts: 104
Location: Warrington, UK

PostPosted: Fri Jun 22, 2018 5:58 pm    Post subject: Reply with quote

Having apparently completed all my wiring work, my attention now turned to ensuring that my current smallest loco will work on the layout. The whole point of a small layout being the use of small locos, surely?
The machine I am speaking of is a Trix T3 0-6-0 tank engine and ‘cute’ is a fair description of this one as it is only 98mm (4”) long. I had read on German forums of a trick to alter the rigid suspension and as, on it’s previous test it had not performed sufficiently well for me anyway so I resolved to do some work on it.


Here is the chassis stripped right down to its bare bones. Please ignore the metal rod poking out of the top - it’s just a sharpened sewing machine needle that I use as a fine scribe but here, it is balancing the chassis on its side for the picture.


The loco is powered via its rear axle so that must be left alone but I made marks on the chassis approx 1mm above the bearing area.


Then I carefully filed away material of the chassis (bearings), to the depth of my marks. Note that the centre axle has a recess for a spring. Yes, the Trix T3 does have a sprung centre axle! (I had read that it doesn’t). You can now see why the chassis has to be stripped right down as you really don’t want metal filings getting into the motor or the gears.


Simply checking that the filing work is done.


Testing the rolling chassis. A point to note here is that clipping the plastic keeper plate on now is a bad idea as the gears still need to be added and one of their securing pins is not accessible with the wheels secured by the keeper plate. Fortunately, finding this out the hard way didn’t cost too much time but it did result in more handling of the delicate valve gear - which caused stress!


Rebuilding the motor/gears and circuitry. I had noticed the original pick-up wires were slightly too thick and had become trapped by the body so I replaced them.

Now I was ready for an electrical then driving test - not so much a disaster, just a damp squib!
Reading the decoder/loco on my programming track - nothing was working at all, it was completely dead. Was it the decoder or what? No, the decoder was fine.
Changing the decoder for a blanking plug and testing on my analogue track showed there was a very intermittent electrical contact - somewhere.
I used a ‘buzzer’ to check all the pick-ups and slowly narrowed the problem down to the 21 pin decoder socket. It seemed that some or all of these very fine pins were loose, something that I don’t recall previously finding. I decided that tinning all these pins with solder might do the trick and it did.


The offending 21 pin connector with solder tinning.

Having re-fitted the decoder and testing on the programming track, everything appeared fine electrically. At last, I could test run the little T3 on my layout and I’m very pleased to report that she performed very well indeed - as a chassis. Confirming that all appeared well, I now had to add thread lock to the tiny nuts that held the valve gear in place, secure the wiring and put the body back on. This more than doubles the weight of the loco to 125 grams, so better testing can be carried out.


Here she is crawling over a point without hesitation at speed step 1.


It’s difficult to tell and there is really not that much movement but here she is riding over a shallow obstacle, a scalpel blade.
I think she’s ready for service.
Cheers,
John.
_________________
TTFN,
John E.

My club's 2018 exhibition:
http://forum.mtimag.co.uk/viewtopic.php?t=2150
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Broadoak



Joined: 05 Nov 2007
Posts: 974
Location: Northamptonshire

PostPosted: Wed Jun 27, 2018 8:42 am    Post subject: Reply with quote

She really is a most attractive locomotive, got bags of character.

Regards Peter M
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