Search found 156 matches

by barhamd
Sun Jan 20, 2013 10:31 pm
Forum: Layouts and Operations
Topic: Calcutta sidings 2 and universal fiddle yard first test
Replies: 118
Views: 48670

Re: Calcutta sidings 2 and universal fiddle yard first test

Probably time for a new thread, we've hijacked this one for long enough!

David
by barhamd
Sun Jan 20, 2013 12:58 pm
Forum: Layouts and Operations
Topic: Calcutta sidings 2 and universal fiddle yard first test
Replies: 118
Views: 48670

Re: Calcutta sidings 2 and universal fiddle yard first test

Yes, I've been wondering about trying to create some kind of shared resource for designs. The Open Source software community have things like Sourceforge where developers can share code usually under the terms of what is known as the GPL. This is basically a license that says (and please nobody shou...
by barhamd
Mon Jan 14, 2013 8:40 pm
Forum: Layouts and Operations
Topic: Calcutta sidings 2 and universal fiddle yard first test
Replies: 118
Views: 48670

Re: Calcutta sidings 2 and universal fiddle yard first test

I think the problem with standard plasticard is that it gives of chlorine gas when it is burned by the laser. Doesn't damage the laser - just the operators!

I just ordered some ABS which is laser-cutable from 4D so I'll see how that goes.

David Barham
by barhamd
Sun Jan 13, 2013 5:24 pm
Forum: Layouts and Operations
Topic: Calcutta sidings 2 and universal fiddle yard first test
Replies: 118
Views: 48670

Re: Calcutta sidings 2 and universal fiddle yard first test

The Model Shop in London sell it mail order, it ain't cheap though..
http://www.modelshop.co.uk/mdf-384-c.asp

David
by barhamd
Sun Jan 13, 2013 4:17 pm
Forum: Layouts and Operations
Topic: Calcutta sidings 2 and universal fiddle yard first test
Replies: 118
Views: 48670

Re: Calcutta sidings 2 and universal fiddle yard first test

Probably time for a 'laser cutting' thread... This was my first attempt with the cutter Makespace in Cambridge had delivered last week. This was a wall based on Thaxted water tower. I must admit to being pretty bowled over by what the machine can do. I've decided to draw out a little weighbridge hun...
by barhamd
Thu Jan 03, 2013 10:36 pm
Forum: Layouts and Operations
Topic: Calcutta sidings 2 and universal fiddle yard first test
Replies: 118
Views: 48670

Re: Calcutta sidings 2 and universal fiddle yard first test

You might be lucky and find that there is a 'hackspace' movement opening up something in your area. These seem to be springing up in quite a few major cities and offering 'interesting equipment' to use for the price of a gym membership (anyone suggesting I could personally make better use of the gym...
by barhamd
Thu Mar 22, 2012 9:58 pm
Forum: jim s-w
Topic: New Street progress
Replies: 406
Views: 120406

Re: New Street progress

Surely there should just be a dangling wire and the phone book needs to be ripped? I always remember these in a vandalized state!

David
by barhamd
Sat Jan 14, 2012 12:36 am
Forum: Signals and Control Systems
Topic: Lever Frames
Replies: 93
Views: 75613

Re: Lever Frames

The servos I used were DYS0201 from Giantcod http://www.giantcod.co.uk/dys0201-micro-servo-torque-p-402575.html at £2.83 each. The method of locking with a two lengths of of K&S tube, say £2 each for the length which did 20 levers, I made all the mechanics for the locking of 20 levers in an even...
by barhamd
Sun Jan 08, 2012 7:19 pm
Forum: Signals and Control Systems
Topic: Lever Frames
Replies: 93
Views: 75613

Re: Lever Frames

I can't see how you can do any better than a servo as a replacement for a solenoid for much less than the price of a tortoise equivalent. But then I can't see how you could use servos in a method much better than the MERG servo4 board which drives 4 servos each from an 'on-off' switch and allows set...
by barhamd
Sat Jan 07, 2012 1:41 am
Forum: Signals and Control Systems
Topic: Lever Frames
Replies: 93
Views: 75613

Re: Lever Frames

A better description of the servo based locking system which locks individual levers is in a more recent blog entry http://www.rmweb.co.uk/community/index.php?/blog/186/entry-6813-fun-with-servo-based-interlocked-lever-frame/

David
by barhamd
Thu Jan 05, 2012 10:25 pm
Forum: Signals and Control Systems
Topic: Lever Frames
Replies: 93
Views: 75613

Re: Lever Frames

Using a SHAG frame on my layout, 20 levers with electric interlocking via servos.

Only issue is getting a decent joint between the steel handles and the nickel silver levers, every now and again I seem to have to resolder the joint.

David Barham
by barhamd
Wed Jan 04, 2012 10:53 pm
Forum: Mark Tatlow
Topic: A Highland Miscellany
Replies: 300
Views: 94915

Re: A Highland Miscellany

I realised looking at what you Mark had done that I had missed using a pivot on the wire from the servo, I was just extending the arm from the servo and expecting that to work. Obviously if you pivot the wire you can get an additional mechanical advantage. I'll leave the ones that i have build using...
by barhamd
Tue Jan 03, 2012 8:57 pm
Forum: Mark Tatlow
Topic: A Highland Miscellany
Replies: 300
Views: 94915

Re: A Highland Miscellany

Hi Mark This is interesting because I tried to use a very similar method for my first attempts with servos over the week. I found that the long operating wire pivots on the servo wouldn't give me enough torque to hold the blades over. This is wire I opted to build a separate TOU and then drive it fr...
by barhamd
Tue Dec 06, 2011 9:15 pm
Forum: Starting in P4
Topic: P4 in 5mx3m
Replies: 18
Views: 7292

Re: P4 in 5mx3m

My spare room is probably a little smaller than that at ~10x8ft and I manage to have quite a lot of fun with a continuous run. http://www.rmweb.co.uk/community/index.php?/blog/186/entry-1597-how-much-p4-can-you-fit-into-a-small-room/ http://www.rmweb.co.uk/community/index.php?/blog/186/entry-2234-pl...
by barhamd
Sat Nov 19, 2011 10:22 pm
Forum: Semaphore Signals
Topic: Banner repeater signals
Replies: 5
Views: 4915

Re: Banner repeater signals

Thanks to everyone for their help on this. I've been provided with some excellent pictures by 'Adrian the Rock'. http://www.roscalen.com/signals/Abergele/050921/DownBanner+New.jpg and have now had a reasonable shot at making the working head. bannner-head.JPG All I have to do now is make the post an...
by barhamd
Tue Nov 15, 2011 9:57 am
Forum: Semaphore Signals
Topic: Banner repeater signals
Replies: 5
Views: 4915

Re: Banner repeater signals

Many thanks for that. It will be a great help. I'm wanting to do a single unit rather than an a double and I suspect that by my time period (1950s) the oil lamp may have been replaced by electricity. I suspect this was just a case of removing the lamp and putting a bulb in the existing casing. It al...
by barhamd
Mon Nov 14, 2011 4:54 pm
Forum: Semaphore Signals
Topic: Banner repeater signals
Replies: 5
Views: 4915

Banner repeater signals

Can anyone point me at some drawings of a banner repeater signal? I want to model one ~1950 so the sort with the rotating arm rather than lots of LEDs! I'm a bit unclear how they worked, was it that there was a stationary 'circle' of frosted glass with a pivoted bar behind it and a lamp? Was the piv...
by barhamd
Mon Nov 14, 2011 1:30 pm
Forum: Track and Turnouts
Topic: TOU
Replies: 30
Views: 9362

Re: TOU

I've used some Conrad point motors on my P4 line, but not for turnouts. They have a reasonably quiet 'thunk' but I'm not sure about the torque. I suspect they might have difficulty holding a turnout over, particularly if there is a bit of spring one way or the other in the switch rails. I've used th...
by barhamd
Sun Oct 30, 2011 10:35 pm
Forum: Track and Turnouts
Topic: Wagon Turntables
Replies: 20
Views: 7292

Re: Wagon Turntables

If it were me I'd go for capstans and ropes. If arranged properly you might be able to arrange some of the coupling with rope to happen out of scene. The other approach is some king of pusher in the flangeway.

David Barham
by barhamd
Tue Sep 13, 2011 10:19 pm
Forum: Chassis and Suspensions
Topic: CSBs on tender
Replies: 14
Views: 5803

Re: CSBs on tender

The problem I can't seem to get over is that most tenders have the outside axles very near the ends of the chassis, often considerably less than the half the distance between the axles. This seems to me to imply that if you put a pivot point on the centre point between the axles you can't get anythi...
by barhamd
Tue May 03, 2011 9:58 pm
Forum: Steam Locomotives
Topic: Current thinking on boiler bands?
Replies: 7
Views: 2854

Re: Current thinking on boiler bands?

The loco will be unlined.

Thanks to you all for confirming what I was planning.

David
by barhamd
Mon May 02, 2011 9:30 pm
Forum: Steam Locomotives
Topic: Current thinking on boiler bands?
Replies: 7
Views: 2854

Current thinking on boiler bands?

I'm building a GE/LNER/BR D16/3. DSCF3344.JPG The PDK kit includes some half etched material for boiler bands, I guess the best thing to do is discard them and make my own from insulation tape or something an awful lot finer? You can see more on my rmweb blog http://www.rmweb.co.uk/community/index.p...
by barhamd
Mon Feb 07, 2011 12:53 pm
Forum: Wagons
Topic: BDA bogie bolster suspension.
Replies: 11
Views: 3412

Re: BDA bogie bolster suspension.

Would any of the Bill Bedford range of bogies help you? for example http://www.eileensemporium.com/index.php?page=shop.product_details&flypage=eny_fly_default.tpl&product_id=5748&category_id=288&option=com_virtuemart&Itemid=9 which is the 5'6 bogie? David Barham
by barhamd
Sun Jan 09, 2011 2:28 pm
Forum: Steam Locomotives
Topic: LNER D16/3 please sanity check my wheels!
Replies: 1
Views: 1412

LNER D16/3 please sanity check my wheels!

I'm about the order a PDK D16/3 and the wheels to with it. Can't wait for Ultrascales and can't afford Exactoscales content with Alan Gibsons, so I think I'm after:- Leading 3'9" 12 spoke - Gibson do GS844C 12 spoke 3'8" Driving 7' 21 spoke PB - Gibson do GS884E 'claud' Tender 4'1" - ...
by barhamd
Sat Jan 01, 2011 6:30 pm
Forum: Wagons
Topic: Any ideas how to fit Alex Jackson's to a Shark?
Replies: 1
Views: 1405

Any ideas how to fit Alex Jackson's to a Shark?

I've just taken a half built Cambrian Shark out of the 'in tray' and am faced with a question about how to attach couplings to it. What do you do with Alex Jackson's when you have a ruddy great ballast plough in the way?

help!

David Barham

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