7mm The Derby Line: Basford North

[Compton castle]

Wonderful! Tony

 

[dibateg]

Thanks Steve!

I'm now catching up on the failures from the running session, well a couple of them never made it past the pre session test..

60886 had a derailing pony truck - I'd omitted to add the guide wire to it, I also added some lead weight. She just needs a crew now.


92069 was intermittently shorting, needless to say, on test, she behaved.....


I couldn't get the Wickam trolley around the layout without it stalling, so I added extra pick ups on the trailer - it runs round perfectly now.


I picked up the GC bridge etches last weekend, I just need to cut the girder sections from brass sheet, fortunately I have access to a flat bed guillotine which I hope will do the job, as I find it relly difficult to cut long straight lines in sheet material...

 

[3 LINK]

Hi Tony,
I’m glad it’s not just me that suffers from troublesome locos..

Keep up the good work.

 

[mickoo]

Tony, you need one of these.....



It's a scriber/skrawker, the blade is inside the hook and you just drawn it along a steel rule to make a grove, do three or four light cuts and then the groove is deep enough to take the edge away, then (depending on material thickness) do some bigger deeper cuts. Simply place the material over a edge and bend back and forth until the joint fails and leaves a nice straight edge, you'll need to dress is smooth as it has a sort of cusp on the cut edge; takes seconds to scribe and cut off chunks of sheet metal.

Of course you could always use a guillotine

 

[simond]

I have found that they work best at a particular angle and it didn’t come to hand immediately - it seems to pay off trying a bit higher, or a bit lower, til the shavings come off nicely.

As I’m a cheapskate, I have tried grinding my own from used Stanley blades. Without a great deal of success. YMMV.

 

[mickoo]

Interesting, I’ve not really found that with the Tamiya one, just drag and scribe tending toward the Nordic axe concept than the scalpel

It still has its original blade in from five or more years ago, it’s a remarkable and robust tool.

 

[paulc]

Olfa also have one which works well on brass etc

 

[Ian@StEnochs]

I do similar but using broken hacksaw blades. They work!

 

[Tim Lewis]

Tim,

I would be interested to know more, so if you have the opportunity, please do let us know

thx
Simon

Hopefully Tony won't mind a minor thread hijack, just to close this off. On an NCE handset, press the Prog/Esc key twice (or press Prog 2 as a shortcut). Screen will say something like "Assign Loco to Cab". Press enter. Screen will prompt you for loco number (default is the one currently operating), then press Enter. Screen will prompt for a Cab Number. Enter the number of the Cab that you want to transfer control to, then press Enter. That's it! Extremely useful functionality in my view.
Cheers for now.
Tim

 

[simond]

Thanks!

 

[dibateg]

I'm always happy with a hijack - there is usually interesting discussion..

I managed to get access to a sharp guillotine at a friends place where they prepare rally cars - several shells here in preparation! It'as alaways interesting to see what they are working on.

 

[MarkR]

Wot! No guards on the guillotine!

 

[Phil O]

I've not seen a guillotine since my apprenticeship days.

 

[dibateg]

Work on the first main girder progresses, now I know why I don't like architectural modelling - lots of repetition!

 

[mickoo]

But it looks blinking good....

It's going to look something special when done, yes I do have a bridge Anorak lurking somewhere

 

[dibateg]

Thanks Mick - I hope to do the etch justice..

For some reason the central sections had only one rib instead of two. I also need to add some layers to the lower flange. Well , hats one side nearly done.. There should be 1000s of rivets, but there are only so many hours in the day.

 

[timbowales]

"There should be thousands of rivets"
Rivet transfers are your friend.

 

[mickoo]

Thanks Mick - I hope to do the etch justice..

For some reason the central sections had only one rib instead of two.

I'm sure you'll be just fine

That's because you need less strength in the middle than the ends, it's counter intuitive but most of the spans strength is actully at the ends where it's supported, look at modern concrete spans and you'll see the middle section is much thinner than the ends.

 

[simond]

I'm sure you'll be just fine

That's because you need less strength in the middle than the ends, it's counter intuitive but most of the spans strength is actully at the ends where it's supported, look at modern concrete spans and you'll see the middle section is much thinner than the ends.

It's Mike's @Ressaldar & Chris' @Pencarrow area rather than mine, but... Simply Supported Beam - With UDL

The bending is maximal and the shear force is minimal in the middle.

I reckon the concrete bridge would be more than a tad heavier than the live loads it carries, and the weight of the bridge itself drives the section to handle the shear forces

 

[dibateg]

Thanks chaps -

And - a test fitting. once it's all done, the scenic guys can finish that area off. T The GC track bed needs to go up 10mm or so, its a bit too shiny to see it properly...