Thursday, 3 November 2016

Wednesday - shift and shunt

Only a smallish group in today. We knew it was going to be a day for a big shunt that meant there wouldn't be much in the way of carriages or vans in the workshop to get stuck into.

So while others sorted out the shunting Davey Trevor and Des tackled the pile of 'parts' waiting to be painted etc. on the trestles at the end of the paint shop. The box looking parts are the light fittings from 4614. Des is painting one of the DMU rings.

The nearest thing I have to a before picture of 5042 on the first day in the workshop at the start of September. It was in the workshop for about 8 weeks in total. Yet again a carriage comes in one colour and goes out another.

 It is actually back in the barn at present but only because that's the only space we have while we do some more shunting! Todays shunting kept Phil and John busy all day.

Also out in the sunshine during the shunt was 4614 minus doors and window sliders but with the south end  already repaired and the corridor connection back in place.

It has gone into the main workshop and the north end view shows the work progressing on this end. Toilets gone corridor connection off and new steelwork going in.

3132 has now moved into the paintshop via the jacks where aswift bogie swap was carried out. The carriage is now back on its own bogies. Rod was soon at work on the door 3 area. This door area, namely the pillars has been completed so its over to the painters

Davey, Trevor and Des also got to work on the carriage cleaning in from the workshop dust before starting to paint the first top coat round the windows.

We arestill working on the second door pillar liner for door 1. At the start of the day with a basic liner the door didn't get within 8 inches of closing by the end of the day Craig and I had reduced the gap to 1.5 inches.

John Varley was doing some final repairs to door 3 from 4614.

while Paul was installing the drip drainage channel to the bottom of the frame for door 4 of the carriage. Umm just enough head room then.

Colin was starting to assemble the second pair of doors for the goods van.

Not so much a door as a gate post. Seemingly someone, no names, backed the digger into or over it. So John repaired for building services.

Another set of  'entrances' Ok so I am jumping through hoops to keep the link going. Oh yes the DMU hoops all painted and ready to return to Toddington

Steve Smioth drilling out the heat sink screw holes for another LED light strip.

David Ayres, our new volunteer cleaning up window lights from 4614. He did some more of these last week as well. I will let you off them next week honest. Together with Tony Barnard they made great in roads into the 32 that need doing. Welcome David.

Tony took a few minutes out to help Ken free up the rather stiff coupling on the Guards van.


Gordon Smith said...

Why do LEDs need heat sinks, I thought they were so efficient converting power to light and not heat?

The C and W Dept Blog of the Gloucestershire Warwickshire Railway said...

they are a lot BETTER but they still generate heat. The tests Steve has carried out show a temp rise of a few degrees. The heat sink is actually attached to the control circuit board. Steve is an electrical engineer by profession so if he thinks it should have one it gets one.

John F said...

Thanks for the before and after pictures of 5042, it makes you realise what a great job you are all doing, not that you weren't before !!

Anonymous said...

The control board is actually a very low drop out regulator. Led strips are designed for 24v input and a fully charged lead acid battery is 27v. On charge this could be as high as 29v. A led strip consists of a number of 6 x 3 v led units, totalling 18v plus a resistor, so at 29v it would take almost twice as much current and get very hot. LEDs are much more efficient than incandescents but even the best LEDs are only 20% efficient as far as energy conversion is concerned. The rest is heat.

There are plenty of ic regulators that could be used but they need a minimum 2v drop. Using a few components this regulator needs only millivolts drop, it has a link to drop output to half (21v out). The heatsink also mounts it in place of the fluorescent inverters. Temperature rise inside the cover is 22C

I am actually tapping the pcb mounting holes m3 in the photo.
And I'm a electronic engineer.

Steve Smith