Modelling a GWR prototype : CARROG in 4mm & 7mm.

Discussion in 'Workbenches, including workshop techniques.' started by LarryG, 7 February 2019.

  1. P A D

    P A D Western Thunderer

    Hi Larry,
    I fully understand why you and others buy RTR, but it's a great shame when otherwise very good models fall short because of poor quality control. After all, despite being more economic and convenient than building a kit, a few hundred pounds is not peanuts for a model loco. Arriving with missing parts, faulty gears and misaligned coupling pins fouling the cross head is disappointing to say the least.

    Cheers,
    Peter
     
  2. simond

    simond Western Thunderer

    I hope Peter fitted the same wheels as I bought for my Warren Shepherd kit...
     
  3. LarryG

    LarryG Western Thunderer

    Whose wheels were those may I ask? I fitted slightly undersized Slaters but will fit better ones should clearances allow.
     
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  4. simond

    simond Western Thunderer

    Slaters,

    They’re in the box, I’ll check out and let you know when I get in.

    Best
    Simon
     
  5. P A D

    P A D Western Thunderer

    Sorry Larry,
    I overlooked your question about the wheels. Yes they are Slaters wheels, #7837 3'1" 10 spoke on the front and #7843 3'7" 10 spoke on the rear. I believe they should be a inch larger in diameter on both but who can tell the difference without measuring. I assume they are the closest on the Slaters range.

    Considering that I bought several castings from Warren Shephard, I should have remembered that he also does a large prairie kit, as mentioned by Simon.

    Cheers,
    Peter
     
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  6. LarryG

    LarryG Western Thunderer

    Thanks P A D. I should have ordered #7843 3' 7" 10 spoke as being the nearest in Slaters range, but a senior moment saw me choosing the wrong number. PhilH pointed out the wheels were a bit small. Easily remedied when the loco comes back.

    I noticed one has to be careful with pony truck wheels on the Large Prairies because the different number series carried different diameters.
     
  7. simond

    simond Western Thunderer

    Sorry, home late, MrsD dragged me, kicking and screaming to a Wreckless Eric gig which I thoroughly enjoyed.

    Will check wheels and report tomorrow.
    S
     
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  8. simond

    simond Western Thunderer

    image.jpg
     
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  9. simond

    simond Western Thunderer

    image.jpg

    BnB Telford last year. Think it counted as “an unmissable bargain”

    Cylinder formers are missing. Tant pis.

    Atb
    Simon
     
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  10. P A D

    P A D Western Thunderer

    Simon,
    Check out the copper cap on the chimney. It's a separate turned part that fits onto the brass chimney casting. I used Warren's chimney to replace the somewhat emaciated offering from Scorpio and found that the copper cap was not the correct profile. I pushed it onto some dowel and reprofiled it with a file while spinning in a Black and Decker.

    Before.
    post-13414-0-27286600-1460148893.jpg


    And after reprofiling. Not perfect, but a whole lot better.
    post-13414-0-54222300-1460149549.jpg

    Cheers,
    Peter
     
  11. Richard

    Richard Member

    Larry,

    I can't seem to find a follow up to your query as to what the various spurious plastic bits were with the mogul.

    Is one of them the vacuum pump driven off the offside crosshead?
     
  12. LarryG

    LarryG Western Thunderer

    I never found out Richard, as the loco was returned with a chassis fault.
     
  13. simond

    simond Western Thunderer

    Thanks Peter,

    I’ve got the mogul to build as well.

    I built this from one of Warren’s kits some years back.

    image.jpg

    Please excuse the diversion, Larry

    Best
    Simon
     
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  14. PhilH

    PhilH Active Member

    I've been requested to post this photo of the YouChoos DCC sound installation in Larry's Heljan GWR Prairie

    Prairie DCC.jpg

    The Zimo MX644 decoder was supplied ready fitted to the Zimo ADAMTC expansion board which according to YouChoos boosts the motor output to 1.8A continuous and 2.5A peak. The existing circuit boards are removed, the ADAMTC secured to the metal boiler insert with self adhesive foam pads and the motor and pick up wires soldered to terminals on the ADAMTC. Larry didn't want the firebox light so that wasn't reconnected. YouChoos recommend wrapping the decoder in tape and sticking the Zimo dual speaker on top, but I didn't like that idea so made a brass platform to lie clear of the decoder with one end bent into a 'Z' shape to be secured by the screws holding the original circuit boards. Just to be sure if it ever works loose the underside of the platform is lined with self adhesive foam and insulation tape (I'm a belt and braces kinda guy !) and the speaker and a YouChoos 17000uF stay alive fixed on top with more self adhesive foam. Both units are wired directly to the ADAMTC board. Altogether a fairly simple and straightforward installation.
     
  15. LarryG

    LarryG Western Thunderer

    Thanks Philip. It's a very neat form of installation on the brass shelf. The stay-alive supplied with the decoder and speaker etc left the sound running for quite some time after the power was turned off. I meant to run the Pannier to compare with the Prairie sound. I'll put the same sound in the forthcoming Small Prairie.
     
  16. Focalplane

    Focalplane Western Thunderer

    For the record I had a duff ADAMTC board which blew the 644 decoder. Zimo had left a pin on the connector which allowed me to install the 644 backwards. YouChoos sorted it out but in the end I decided to do without the ADAMTC board and wired a 645R directly to the motor. So far so good. The stall current was less than 1 amp which suggested the 645R would be adequate.
     
  17. LarryG

    LarryG Western Thunderer

    It's a bit late to start a layout thread, so here's a work in progress shot of Carrog.....:D:D

    WEB Layout scrap 1.jpg
     
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