DCC Developments & Experimentation

The place for general discussions and requests for help on all matters relating to T gauge.
davidmatthewson
Posts: 26
Joined: Mon May 02, 2016 7:50 pm

Re: DCC Developments & Experimentation

Post by davidmatthewson »

:D

davidmatthewson
Posts: 26
Joined: Mon May 02, 2016 7:50 pm

Re: DCC Developments & Experimentation

Post by davidmatthewson »

Oh well.. I'm going to bite the bullet and order a DCX65 from Alan at Tgauge. Com and see what I can do.. Or not!

I'll report back in a few weeks.

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dkightley
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Location: Nottingham, UK

Re: DCC Developments & Experimentation

Post by dkightley »

David

Which chassis are you going to try and install into??
Doug Kightley
Webmaster here and volunteer at the National Tramway Museum http://www.tramway.co.uk

davidmatthewson
Posts: 26
Joined: Mon May 02, 2016 7:50 pm

Re: DCC Developments & Experimentation

Post by davidmatthewson »

I like the use of the word 'Try'.. that's what worries me!

To start with I was going to use one of the transparent bogie units, which I use with Shapeways 3D prints over them. I know space is tight - very tight..

Fingers crossed - any tips BTW?

D.

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dkightley
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Location: Nottingham, UK

Re: DCC Developments & Experimentation

Post by dkightley »

A DCC decoder will fit with relative ease into the 23m power unit. There's a quite large gap between the back of the motor and the mount for the non-powered bogie.

Start off with a brave move!. The decoder pcb is made in multiples that are snapped into single units. This leaves a castellated edge on the pcb….you will need to gently file the small amount of excess off with a needle file to narrow the pcb down so it fits within the width of the bodyshell. This may sound brutal....but take a good look at what there is before starting....

The decoder will slide into the gap with a piece of insulation (I use paper) preventing any contact with the busbars. I soldered the motor wires to the spring contacts on the motor and the supply wires to the busbars.....and slipped a slightly more robust piece of insulation between the spring contacts and the busbars. Look at the righthand photo for the 23m cunit on tgauge.com ( https://www.tgauge.com/product/238/28/2 ... ed-chassis ) and you'll be able to tell how I did it. You have to make the wires as short as you dare...and I removed the light o/p wires as don't currently use lights.

I've also fitted DCC into a 20m unit....but a bit of carving is needed to make sufficient space for the decoder and wires! And I've succeeded fitting into a 16m unit.....but major surgery is needed to create a space for the decoder!
Doug Kightley
Webmaster here and volunteer at the National Tramway Museum http://www.tramway.co.uk

davidmatthewson
Posts: 26
Joined: Mon May 02, 2016 7:50 pm

Re: DCC Developments & Experimentation

Post by davidmatthewson »

Thanks for the encouraging words Doug - and the tip about filing it down. OK, last question - (for a bit!) - what's the best way to cut the bus bars to 'insert' the DCC wiring loom? Very small snips?

Thanks too for the pic ref - I see what you mean about the 'ledge' over the training bogie.

Sorry for all the Qs but I've always been happy to learn from chaps who actually 'done it'..

D.

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dkightley
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Location: Nottingham, UK

Re: DCC Developments & Experimentation

Post by dkightley »

You only need to cut the busbars in the 16m unit...and that's to allow the decoder board sit on top of the motor once you've removed the terminal block off the motor!!

Once you've connected the pcb to motor wires to the side of the motor spring contacts, you can break the busbar to motor contact connection by sliding in a small piece of insulation between the bars and the spring contacts.

Cutting the busbars does introduce two problems....the stability of the remainder of the bar..they're only held in place by very weak pins!...and you have extra wiring to do, which can very easily turn problem one into a nightmare! And this happened to me on one of my 125 units!
Doug Kightley
Webmaster here and volunteer at the National Tramway Museum http://www.tramway.co.uk

davidmatthewson
Posts: 26
Joined: Mon May 02, 2016 7:50 pm

Re: DCC Developments & Experimentation

Post by davidmatthewson »

Thanks Doug - all good to know..

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dkightley
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Location: Nottingham, UK

Re: DCC Developments & Experimentation

Post by dkightley »

Here's three shots of a decoder fitted to a 23m chassis:
P1020107_red.JPG
P1020107_red.JPG (62.61 KiB) Viewed 155 times
P1020108_red.JPG
P1020108_red.JPG (65.49 KiB) Viewed 155 times
P1020109_red.JPG
P1020109_red.JPG (79.46 KiB) Viewed 155 times
Red and black wires are the power...and are soldered to the underside of the busbars. Orange and grey are the motor connections, soldered to the side of the spring contacts on the motor. Note the piece of card inserted between the contact springs and the busbars.
Doug Kightley
Webmaster here and volunteer at the National Tramway Museum http://www.tramway.co.uk

davidmatthewson
Posts: 26
Joined: Mon May 02, 2016 7:50 pm

Re: DCC Developments & Experimentation

Post by davidmatthewson »

'A picture tells a thousand words''.. it all looks pretty tight - and very neat too.

Thanks.

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