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Dagworth

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About Dagworth

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    http://www.dagworth.net

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    The DCC surgery - Cheltenham, England

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  1. There's full track voltage with DC at full pelt too. On a commutator the gaps get constantly refilled with carbon as they pass a brush twice every revolution of the motor. Such gaps on the track that have opposite polarities are relatively few and will only get carbon in them when the graphite is applied. That small amount will get burned away very rapidly if it does make contact across the gap (so quickly that you'd be hard pushed to notice it) Andi
  2. Once the brushes get softened by the oil then yes the graphite will gather in the commutator gaps where it will have full motor voltage going through it so yes it will burn. You don't get that problem on the rails as you don't have a source of refreshed graphite every rotation and you rarely have full track voltage separated by such small gaps. Andi
  3. I'm guessing that graphite cannot oxidise and so remains conductive? A layer of graphite over the rail heads will protect the rail from oxidising too. Andi
  4. Anyone else find that sometimes the black dog sits on the bit that you need to do next on a project and the only way to remove him is to go and do a different project altogether? I've had him sitting on one of the Ravens boards recently stopping all progress on that project so moved on to a small distraction called Catspaw until the dog goes for a walk somewhere else. Andi
  5. Isn't this the same drawing Clive posted on the 13th? Andi
  6. The arched bridge on the Up side of Derby Road (Ipswich) on the Felixstowe line used to show clear scarring where oversized boxes had unintentionally increased the loading gauge a bit. Andi
  7. The ESU Switch pilot decoder can operate both solenoid and servo point machines http://www.esu.eu/en/products/switchpilot/switchpilot-v20/ Andi
  8. My barriers are built from an etch that Brian Hanson made up for me to my own design, the motor housing are just plasticard boxes around a bearing mech that goes below the baseboard to the servos. No idea when they went from bells to warblers I'm afraid Andi
  9. I'd not seen the Viessmann crossing before, interesting to see that a manufacturer has finally done folding skirts. Looks like they have used much the same principal as I did on my own crossing. This is driven by RC servos Andi
  10. Much easier painting rails before ballasting!

    1. Clive Mortimore

      Clive Mortimore

      That will learn ya. :tomato::tomato::blackeye:

  11. The top diagram with only the single resistor will blow the LEDs as you have full track voltage across them with no resistor Andi
  12. The AT supply I use has very fast short-circuit protection built in, it takes a few attempts to get it to start when the layout is first connected while it tries to charge all the capacitors running the point machines. Andi
  13. The most difficult part of DCC fitting a Hornby 86 is isolating one of the motor brushes from the motor frame. Other than that it's a very easy job. Andi
  14. I have the PSU in a separate box under the layout, I use the +12, -12 and +5 supplies (My layouts have significant TTL type electronics that like a nice stable 5v supply) and the 0volt rail. The two 12v supplies are used for point control as I find the 24v differential between them is bombproof for twin solenoids. Other items (mostly LEDs) use either the +12 or +5 to 0v supplies dependant on the brightness I want. I have no need to the 3.5v outputs so ignore them. Andi
  15. I've used AT power supplies very successfully on both my larger layouts, but the AT only requires a power switch. I know at ATX supply has a different start mechanism but other than that there is no reason why it shouldn't be useful Andi
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