Search found 829 matches

by David B
Mon Mar 07, 2011 10:26 pm
Forum: Electrics
Topic: Servo Twitch
Replies: 19
Views: 9070

Re: Servo Twitch

Keith,

Thank you very much for this. Please pass my thanks on to your MERG colleagues. It is much appreciated.

David
by David B
Mon Mar 07, 2011 9:09 am
Forum: Electrics
Topic: Servo Twitch
Replies: 19
Views: 9070

Re: Servo Twitch

Thanks, Keith. I'll pass this on.

David
by David B
Sun Feb 27, 2011 1:52 pm
Forum: Electrics
Topic: Servo Twitch
Replies: 19
Views: 9070

Re: Servo Twitch

In reply to Keith's last post and enquiry: Keith is probably on to it. The problem did seem to occur when the button was released but also occured if it was held down for a long time. The main reaction though was on quick repetitive on and offs. Interestingly since I re-sited one of the boards away ...
by David B
Sat Feb 26, 2011 9:14 am
Forum: Electrics
Topic: Servo Twitch
Replies: 19
Views: 9070

Re: Servo Twitch

More info about the servo set up that twitches: 1. Cables to the servos are as supplied and therefore quite short (a point made already). 2. Screening the cables made no difference and I also tried encasing one of the servos in lead and again there was no difference. 3. However I tried various locos...
by David B
Wed Feb 23, 2011 8:07 am
Forum: Electrics
Topic: Servo Twitch
Replies: 19
Views: 9070

Re: Servo Twitch

Keith and everyone who has contributed,

Thank you for your help so far. I will see what else I can find out to answer Keith's questions.

I am, though, away for a few days, so will not be able to put anything up until the weekend.

David
by David B
Tue Feb 22, 2011 9:32 am
Forum: Electrics
Topic: Servo Twitch
Replies: 19
Views: 9070

Re: Servo Twitch

I now have more information about the way the servos are installed. I quote directly from the email I received. 'The servo and servo control board are as supplied by Heathcote. There are two servos installed under the layout to work the level crossing but only one twitches when a loco passes. The se...
by David B
Mon Feb 21, 2011 1:12 pm
Forum: Electrics
Topic: Servo Twitch
Replies: 19
Views: 9070

Re: Servo Twitch

Thanks, Keith. I, too, will see if I can find out more.

David
by David B
Mon Feb 21, 2011 10:37 am
Forum: Electrics
Topic: Servo Twitch
Replies: 19
Views: 9070

Re: Servo Twitch

No, Keith. The discussions were with people in the Mid Devon group. There was experience of the 'twitch' there and they had heard of other people who had also had it.

David
by David B
Mon Feb 21, 2011 8:16 am
Forum: Electrics
Topic: Servo Twitch
Replies: 19
Views: 9070

Servo Twitch

In recent discussions, I have heard mention of some difficulties with servos when a loco passes or an electromagnetic uncoupler is used in that the servos 'twitch'. For example, the servos used to control level crossing gates give a twitch when a loco passes. Twisting together the wires to the servo...
by David B
Mon Feb 14, 2011 11:17 pm
Forum: Chassis and Suspensions
Topic: Suspension design for a 2-4-0, CSB?
Replies: 34
Views: 14547

Re: Suspension design for a 2-4-0, CSB?

Thanks, Mark. I feel some experimenting coming on!

David
by David B
Mon Feb 14, 2011 7:58 pm
Forum: Chassis and Suspensions
Topic: Suspension design for a 2-4-0, CSB?
Replies: 34
Views: 14547

Re: Suspension design for a 2-4-0, CSB?

Mark, I like your pick-up arrangement. Any chance of a close-up and/or a bit more description. (Apologies for jumping in on a different thread). You may have seen that I was enquiring about top wipers in the thread in this same category - http://www.scalefour.org/forum/viewtopic.php?f=19&t=1247 ...
by David B
Mon Feb 07, 2011 9:42 am
Forum: Layouts and Operations
Topic: Tales from a mineral twig...
Replies: 13
Views: 5623

Re: Tales from a mineral twig...

Apologies, Paul.

I am not familiar with either of the areas - where Cumbria or Saffron Walden - but I suppose the greatest difference is in the architecture. You have a few lineside structures to convert to the GE, but the (?is it a) mill is presumably built in a different material.

David
by David B
Sun Feb 06, 2011 3:08 pm
Forum: Chassis and Suspensions
Topic: Top wipers
Replies: 21
Views: 7909

Re: Top wipers

It has taken me some time, but I have read and made use of the advice offered, eventually come up with the following. The wire is .35pb and I have attached brass wipers to the ends. I made the holder for the pickups from some scrap, attached it to some very thin copper clad which in turn is epoxyed ...
by David B
Sun Feb 06, 2011 10:45 am
Forum: Layouts and Operations
Topic: Tales from a mineral twig...
Replies: 13
Views: 5623

Re: Tales from a mineral twig...

Isn't there a space near the loos?

David
by David B
Thu Feb 03, 2011 7:38 pm
Forum: Coaches and NPCS
Topic: LNER 52'6 Luggage Brake Van Transfers.
Replies: 1
Views: 1566

Re: LNER 52'6 Luggage Brake Van Transfers.

I haven't a clue about LNER stuff, but have you tried Fox Transfers?

http://www.fox-transfers.co.uk/

David
by David B
Mon Jan 31, 2011 8:33 pm
Forum: Chassis and Suspensions
Topic: Top wipers
Replies: 21
Views: 7909

Re: Top wipers

This is developing into an interesting business. Keep going, chaps, as I am sure it will be of interest & use to others. Martin - please carry on. Philip - is the suggestion that PB, with any arcing or heat, will react adversely with steel? I had thought that the wire operating on the tyre face ...
by David B
Mon Jan 31, 2011 8:35 am
Forum: Chassis and Suspensions
Topic: Top wipers
Replies: 21
Views: 7909

Re: Top wipers

Thank you, Will. The screw through the lead goes straight a nut under the cab floor but I take the point. The picture, too, is very helpful - worth a thousand words? It's a lovely, clear piece of work. I had in mind soldering the copper clad to the frames and scoring an electrical break. My mind set...
by David B
Sun Jan 30, 2011 2:53 pm
Forum: Chassis and Suspensions
Topic: Top wipers
Replies: 21
Views: 7909

Top wipers

I have a problem with pick ups. I am building this 4-4-2T which was designed (a) for OO and is now P4 and (b) to take plunger pickups which I am not happy with and anyway, they won't fit now. I cannot get to the tyres very easily underneath because of spring detail which is part of the frames and I ...
by David B
Sun Dec 12, 2010 5:40 pm
Forum: South London (SLAG)
Topic: Exhibiting St Merryn
Replies: 6
Views: 3825

Re: Exhibiting St Merryn

. . . and on the Scaleforum retrospective http://www.scalefour.org/shows/S4um2010/stmerryn.html

David B
by David B
Sun Apr 11, 2010 11:15 am
Forum: Track and Turnouts
Topic: Tiverton (NOT Junction)
Replies: 2
Views: 1691

Re: Tiverton (NOT Junction)

Thanks, Craig. This is the sort of thing I need. Much appreciated.

If anyone has a copy of An Historical Survey of Great Western Stations, Volume 4, please get in touch.

David B
by David B
Sun Apr 11, 2010 8:42 am
Forum: Track and Turnouts
Topic: Tiverton (NOT Junction)
Replies: 2
Views: 1691

Tiverton (NOT Junction)

Can anyone help me with research in to Tiverton Station - the town, NOT the Junction? Earlier the period, the better, but anything will be appreciated. Is there anything in the Clarke/Potts Historical Survey books vols 3 or 4? If so, can anyone let me have a scan or, better still, the book? These tw...
by David B
Mon Jan 19, 2009 5:41 pm
Forum: Wagons
Topic: Weights
Replies: 4
Views: 2554

Weights

Is there a recommended weight range for wagons (and coaches)? I have been given two 'formulae': 1. 28g per wagon plus 14g for each additional 25mm of length. 2. 1oz per axle plus ½oz for each additional inch of length. Neither of these state what the base line is, but I am assuming a 10' wheelbase o...
by David B
Sun Oct 26, 2008 10:08 am
Forum: Tools and Techniques
Topic: Resistance Soldering
Replies: 96
Views: 18010

Resistance Soldering

I have recently bought a London Road Models RSU. I have made a label to show where to put the leads for the various power outputs, so have attached the graphic in case it is of use to anyone else. It is designed for an Avery L7161 label, 63.5mm x 46.6mm.

David B
by David B
Sun Oct 26, 2008 10:02 am
Forum: Wagons
Topic: Brake gear
Replies: 9
Views: 3605

Re: Brake gear

I have got hold of the Tourrett book and it is very informative - it is also an interesting read!

Thank you for your help.

David B
by David B
Thu Oct 16, 2008 11:20 am
Forum: Wagons
Topic: Brake gear
Replies: 9
Views: 3605

Re: Brake gear

Thank you. I am tracking down the Tourret's book which sounds useful. I am making the David Geen kit, but the photographs are photocopies of photographs and not at all clear for the underframe. It is the arrangement of 'bits' on the underframe that I am having difficulty with - what V hangers, roddi...

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