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by grovenor-2685
Wed Oct 17, 2018 8:45 pm
Forum: Layouts and Operations
Topic: Construction of a Test Track
Replies: 610
Views: 43320

Re: Construction of a Test Track

Further discussion of chairs and rail mismatches now at https://www.scalefour.org/forum/viewtopic.php?f=40&t=6083
Rgds
by grovenor-2685
Wed Oct 17, 2018 4:28 pm
Forum: Product Information
Topic: Chairs and Rail
Replies: 12
Views: 559

Chairs and Rail

I've given this its own topic as it seemed out of place in 'Construction of a test track' som long after the previous discussion.
The previous mention can be found here https://www.scalefour.org/forum/viewtopic.php?f=9&t=5241&hilit=test+track&start=125#p56043
Regards
by grovenor-2685
Tue Oct 16, 2018 10:01 pm
Forum: Signals and Control Systems
Topic: Mk2 Lever frame musings
Replies: 31
Views: 2462

Re: Mk2 Lever frame musings

One thing no one has asked about is the half red - half green lever. This is "stop shunt" signal - ie it is a shunt signal which is normally "off" to allow shunting, but when the lever is pulled, shunting is stopped. I don't know what colour these should be, so I used red/green....
by grovenor-2685
Tue Oct 16, 2018 9:53 pm
Forum: Track and Turnouts
Topic: Historic Point Motors
Replies: 12
Views: 430

Re: Historic Point Motors

The M3 series point motors were quite an old design by the 1960s. The new BR spec for point motors came out in the early 60s after which the usual Westinghouse supply was the 'Style 63'. Those cast iron relay boxes did not hold very much, that looks to be a row of 6 boxes, doors to the right, with a...
by grovenor-2685
Tue Oct 16, 2018 1:23 pm
Forum: Track and Turnouts
Topic: Historic Point Motors
Replies: 12
Views: 430

Re: Historic Point Motors

Difficult to be sure what is going on from that picture, as the relay boxes are hiding the rodding cranks. But the most likely situation is that the point motors are temporarily disconnected with the rodding passing underneath to the point stretcher.
Regards
by grovenor-2685
Tue Oct 16, 2018 12:12 pm
Forum: Track and Turnouts
Topic: Historic Point Motors
Replies: 12
Views: 430

Re: Historic Point Motors

Yes, with an acknowledgement.
Rgds
by grovenor-2685
Tue Oct 16, 2018 9:19 am
Forum: Track and Turnouts
Topic: Historic Point Motors
Replies: 12
Views: 430

Re: Historic Point Motors

My question as a novice is about the mechanical vs electrical operation of the point motors. I have looked online at the wbsframe.mste.co.uk and it is very informative but for the non professional I still can't work out some basics, sorry. Do the Westinghouse (1920s) frames (electric) still have me...
by grovenor-2685
Sun Oct 14, 2018 9:40 pm
Forum: Starting in P4
Topic: Making a Start - The Peak District Midland / Monsal Dale pre 1903
Replies: 855
Views: 61727

Re: Making a Start - The Peak District Midland / Monsal Dale pre 1903

Le Corbusier wrote:
Thanks Keith,

What Thickness of guitar string do you use?

I have a collection from 8 thou to 12 thou, most wagons I think are using 10 with wagon weights around 50g.
by grovenor-2685
Sun Oct 14, 2018 3:02 pm
Forum: Starting in P4
Topic: Making a Start - The Peak District Midland / Monsal Dale pre 1903
Replies: 855
Views: 61727

Re: Making a Start - The Peak District Midland / Monsal Dale pre 1903

The first is to do with the Bill Bedford sprung W irons. The guitar wire threads through the base of the waisted bearing carrier and then is located on either side in a pilot hole in the etch. The wire is not equally straight ... some sections having a slight curvature. This means that when all the...
by grovenor-2685
Thu Oct 11, 2018 12:52 pm
Forum: Track and Turnouts
Topic: Unusual Trackwork
Replies: 17
Views: 1542

Re: Unusual Trackwork

Knuckles wrote:Explain how this point works! :D

i take it from the smiley that you know the answer, it doesn't work. :)
Regards
by grovenor-2685
Sat Sep 29, 2018 12:44 pm
Forum: Electrics
Topic: Scalefour lever frame & Cobalt point motors
Replies: 9
Views: 360

Re: Scalefour lever frame & Cobalt point motors

The diagram is in the tortoise instructions,
See diagrams 2 and 3 on attached.
800-6000ins.pdf
(209.83 KiB) Downloaded 25 times

Rgds
by grovenor-2685
Fri Sep 28, 2018 8:59 pm
Forum: Electrics
Topic: Scalefour lever frame & Cobalt point motors
Replies: 9
Views: 360

Re: Scalefour lever frame & Cobalt point motors

you will need a split DC supply ( ie , +12, -12, 0v )

Yes, and simply obtained from a transformer by using two diodes, abeit more of an issue with switch mode PSUs.
by grovenor-2685
Fri Sep 28, 2018 8:11 pm
Forum: Electrics
Topic: Scalefour lever frame & Cobalt point motors
Replies: 9
Views: 360

Re: Scalefour lever frame & Cobalt point motors

You can certainly operate a tortoise with a single pole switch, eg the microswitch that is intended to be fitted to the frame, so I would expect that to be equally doable with a Cobalt, if there is a problem with the Cobalt design putting a cheap relay in between will sort it.
Regards
by grovenor-2685
Mon Sep 24, 2018 2:07 pm
Forum: Track and Turnouts
Topic: Working point rodding from DCC Concepts
Replies: 8
Views: 1010

Re: Working point rodding from DCC Concepts

Under Rodding it states "It is the correct size to accurately represent 4mm scale point rodding."

Ah, so it does, don't know how I missed that when reading through it. :)
Regards
by grovenor-2685
Sun Sep 23, 2018 6:05 pm
Forum: Track and Turnouts
Topic: Working point rodding from DCC Concepts
Replies: 8
Views: 1010

Re: Working point rodding from DCC Concepts

Apologies if I've missed it but the data sheet doesn't seem to mention what scale these parts are being produced in. Agreed, it does not seem to say explicitly what scale. Cranks are described as a tiny bit overscale, A-frames as being almost to scale. :) I think that 00 is probably a reasonable as...
by grovenor-2685
Thu Sep 20, 2018 9:09 am
Forum: Starting in P4
Topic: Making a Start - The Peak District Midland / Monsal Dale pre 1903
Replies: 855
Views: 61727

Re: Making a Start - The Peak District Midland / Monsal Dale pre 1903

I certainly don't see a 1F using more water per mile than Tornado, even given the saturated/superheated difference.
Regards
by grovenor-2685
Fri Sep 14, 2018 10:48 am
Forum: Electrics
Topic: which controller for a test track?
Replies: 15
Views: 943

Re: which controller for a test track?

I now want to renovate my test track and connect it with a new DC controller. As this would be for loco testing only I would prefer pure DC with no feedback or such sophistication Note the original request. Sophisticated devices like Pentrollers/pictrollers don't come anywhere near this requirement...
by grovenor-2685
Wed Sep 12, 2018 11:42 am
Forum: Paul Townsend
Topic: A cautionary tale re Exactoscale RSU
Replies: 13
Views: 815

Re: A cautionary tale re Exactoscale RSU

Why do these not suffer from the same problem of heat build up and solder migration? The heat produced is a result of the power dissipated in the joint W = I 2 R With an RSU the current is much higher than for any normal model railway operating current, potentially well above 10amps So even if the ...
by grovenor-2685
Sat Sep 08, 2018 8:38 am
Forum: Track and Turnouts
Topic: "Wye" Turnout templates
Replies: 6
Views: 551

Re: "Wye" Turnout templates

Back in the days of printed templates we used to slit and bend the templates as described here: https://www.scalefour.org/history/protofoursociety/manual/4.1.3-construction-templates (Unfortunately much of the value of these archived docs is lost as the illustrations have been removed). Nowadays I w...
by grovenor-2685
Wed Sep 05, 2018 8:28 pm
Forum: Track and Turnouts
Topic: Ballasting ply sleepered track
Replies: 28
Views: 1493

Re: Ballasting ply sleepered track

So the questions remain: have I missed something, is there an easier and quicker way to do this - what is the recommended best practice for ballasting ply sleepered track? The protofour manual advised laying track and ballast together and that has always worked well for me. See http://www.norgrove....
by grovenor-2685
Fri Aug 24, 2018 9:48 pm
Forum: Vehicle dynamics and trackholding
Topic: Do we need 1:20 Rail Inclination
Replies: 38
Views: 2064

Re: Do we need 1:20 Rail Inclination

Look at http://www.norgrove.me.uk/GWRtracknotes/R4423.pdf
You will see why the Maximum cant is commonly used on tight radius curves, the % increase in speed can be considerable.
Regards
by grovenor-2685
Wed Aug 22, 2018 9:08 pm
Forum: John Donnelly
Topic: Structures for South Pelaw Junction
Replies: 28
Views: 1929

Re: Structures for South Pelaw Junction

Noel wrote:Wouldn't expansion of the rivet produce compression stresses?

Action and reaction, compression in the rivet has to be resisted by tension in the surrounding metal, otherwise it will distort (or crack).
Regards
by grovenor-2685
Sun Aug 19, 2018 2:25 pm
Forum: Cumbrian Region Area Group (CRAG)
Topic: CRAG Meeting 7 Aug 2018
Replies: 7
Views: 881

Re: CRAG Meeting 7 Aug 2018

Don't use the 'IMG' tag when placing in line, just put the cursor where you want it and click on the place in line button.
Sounds like you had a good day.
Regards
by grovenor-2685
Sun Aug 12, 2018 9:33 am
Forum: Steam Locomotives
Topic: Stroudley Class E1 0-6-0 T
Replies: 11
Views: 951

Re: Stroudley Class E1 0-6-0 T

I think Martin is looking for the crank throw, not the crankpin throw. The crank throw is equal to the cylinder stroke, so that should be quoted somewhere. usually on the diagram so the tractive effort can be calculated. Regards PS. just checked Wikipedia, gives 24" stroke. See https://en.wikip...

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