Search found 825 matches

by Russ Elliott
Fri May 26, 2017 6:29 pm
Forum: Steam Locomotives
Topic: GWR 45xx
Replies: 5
Views: 1347

Re: GWR 45xx

http://www.gwr.org.uk/liveriesloco1906.html

but the 45xx looked very different in 1910 to the Bachmann depiction (which is 1925-ish onward)
by Russ Elliott
Fri May 26, 2017 11:48 am
Forum: New Products
Topic: PenBits Progress: Class 40 and Peak Sprung Bogies
Replies: 9
Views: 2755

Re: PenBits Progress: Class 40 and Peak Sprung Bogies

Gorgeous superelevation transitions, Ian.
by Russ Elliott
Fri May 26, 2017 11:31 am
Forum: Electrics
Topic: Turntable troubles
Replies: 36
Views: 7896

Re: Turntable troubles

In a sector plate design, I came to the conclusion that using a (horizontal, in my case) tapered locking pin could use the backlash in the sector plate traverse to advantage. The pin movement, driven by a 4:1 arm from a screw mechanism, will be approx 40mm, and will be required to nudge and lock the...
by Russ Elliott
Tue May 23, 2017 11:42 am
Forum: Coaches and NPCS
Topic: GWR Dean period coach panels: corner radii & thicknesseses
Replies: 6
Views: 1804

Re: GWR Dean period coach panels: corner radii & thicknesseses

Andrew - for 3-arc stock, I could find only the standard radii for 8' 6 3/4" wide stock, and even then I couldn't track down the actual position of the minor radius.

roof-radii1.png
roof-radii1.png (10.81 KiB) Viewed 1511 times
by Russ Elliott
Fri May 19, 2017 12:22 am
Forum: Steam Locomotives
Topic: Any Wheel and size!
Replies: 62
Views: 7713

Re: Any Wheel and size!

I accept there is probably no such thing as a 'typical' 3D print, but what kind of typical tolerance can be expected of the wheel bore axis with respect to its (as printed, i.e. unmachined) diameter? 0.010", 0.005", 0.002". 0.001", 0005"?

wheelbore-axis-error.png
wheelbore-axis-error.png (1.86 KiB) Viewed 4008 times
by Russ Elliott
Fri May 19, 2017 12:11 am
Forum: Guest Book
Topic: Flexi Chassis an Appreciation
Replies: 467
Views: 56893

Re: Flexi Chassis an Appreciation

We feeling a bit defeatest today Russ? I hope not. I'm merely respecting Jol's perspective, and I think we would be a poorer collective if there weren't differences and diverse preferences, whether arising from keeping with a familiar path or wanting to explore something new. The question of balanc...
by Russ Elliott
Thu May 18, 2017 11:00 am
Forum: Guest Book
Topic: Flexi Chassis an Appreciation
Replies: 467
Views: 56893

Re: Flexi Chassis an Appreciation

That's all fair comment, Jol.
by Russ Elliott
Thu May 18, 2017 10:22 am
Forum: Chassis and Suspensions
Topic: Help with a Brassmasters 4F
Replies: 51
Views: 7984

Re: Help with a Brassmasters 4F

When you say "tighten the middle axle" I presume you mean the effective spring stiffness to be slightly greater than the two outer axles? Yes. This would lead to a tendency for the chassis to see-saw on the middle axle but as your diagram does not have any deflection scaling it is impossi...
by Russ Elliott
Thu May 18, 2017 8:28 am
Forum: Guest Book
Topic: Flexi Chassis an Appreciation
Replies: 467
Views: 56893

Re: Flexi Chassis an Appreciation

Out of curiosity, I just wonder how the experts test their chassis? Do they wait until the body is finished and run the whole lot as one, or have they worked out a way of testing the chassis alone? Thinner CSB springs, for example, to compensate for the lack of body weight, or do they weight the ch...
by Russ Elliott
Wed May 17, 2017 6:46 pm
Forum: Chassis and Suspensions
Topic: Help with a Brassmasters 4F
Replies: 51
Views: 7984

Re: Help with a Brassmasters 4F

P.s. in case anybody is wondering this isn't a CSB, despite having Continuous Springy Beams. It is more closely related to individual springs per axle, but quite what the effect of using one continuous wire is I wouldn't like to say. For the same beam strength and axle loads, a conventional CSB giv...
by Russ Elliott
Wed May 17, 2017 12:25 pm
Forum: Coaches and NPCS
Topic: GWR Dean period coach panels: corner radii & thicknesseses
Replies: 6
Views: 1804

Re: GWR Dean period coach panels: corner radii & thicknesseses

Russ, particular thanks if you prepared those diagrams especially! I did, but it didn't take long, and I needed to get my thoughts together on the subject anyway. Good thinking on the 2.5" moulding radius. That makes sense. I've got some 3-arc roof radii dimensions somewhere, if that would help.
by Russ Elliott
Wed May 17, 2017 12:09 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 27909

Re: P4 vs S4 - Pro's and con's

Thanks Russ and Keith. I had had the impression that in S4 there weren't the problems with obtuse crossings that there are in P4. But a brief read of Appendix C gives the impression that obtuse crossings are problematic on the prototype too, is it right to say, depending on the angle and wheel size...
by Russ Elliott
Wed May 17, 2017 11:09 am
Forum: Guest Book
Topic: Flexi Chassis an Appreciation
Replies: 467
Views: 56893

Re: Flexi Chassis an Appreciation

Knuckles wrote:I may be missing something obvious here but other than estimating or throwing the whole kit, some solder and a guessed amount of lead on a scale beforehand I'm at a loss here.

That will probably take you less time than it did to post your message.
by Russ Elliott
Mon May 15, 2017 12:28 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 27909

Re: P4 vs S4 - Pro's and con's

which I assume means 0.05 either way? That is a way of describing it, yes. Although I can make a BB gauge face to within 0.02 say, the real problem, in setting, is always the runout. For C&W, I use a round thing, rotating it (with finger and thumb of right hand) around the circumference of the ...
by Russ Elliott
Sat May 13, 2017 7:16 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 27909

Re: P4 vs S4 - Pro's and con's

Thanks, Martin. I've now located the instructions. http://4-sf.uk/#gauge_tools
by Russ Elliott
Sat May 13, 2017 3:36 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 27909

Re: P4 vs S4 - Pro's and con's

The dimension relates to the track, not necessarily a gauge tool. In the case of problems you might want to measure the check span, and know what max it should be. I didn't say a check span tool would be superfluous, merely that it is not very practical to use one when building model track. It coul...
by Russ Elliott
Sat May 13, 2017 3:25 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 27909

Re: P4 vs S4 - Pro's and con's

Regarding the parenthesis wording under condition 2, I accept it is a bit naff. (It is not incorrect though.) Julian - I do not condone BB+EF being greater than CG, but as Martin says, the vee does not present a binary choice for the wheel. Deficient checking will cause a nudge from a sharp nose, bu...
by Russ Elliott
Sat May 13, 2017 3:03 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 27909

Re: P4 vs S4 - Pro's and con's

Martin - is there not a danger, in using the 4-SF tool, that it could leave the check gap at 16.2 - 15.4 = 0.8, which presumably would not be approved of because it would trap a 0.8 EF, and it would leave BC (at say 14.4) as non-compliant, and would foul a 14.3 BBmin wheelset? I suppose another way ...
by Russ Elliott
Fri May 12, 2017 5:15 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 27909

Re: P4 vs S4 - Pro's and con's

It is surely more than "style"? It's an important and significant difference. In 4-SF the check rail could be 15.3mm from the opposite rail and remain compliant (max flangeway + max check span, 1.05 + 14.25). That's a full 0.1mm (4 thou) above the min check gauge. Allowing that much toler...
by Russ Elliott
Fri May 12, 2017 3:22 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 27909

Re: P4 vs S4 - Pro's and con's

That's a completely different question. The manufacturing tolerancing on a gauge tool is not the same as the tolerance on the equipment it is used for. Martin - from a purist point of view, you are correct, there should be no 'CGmax'. The P4 standard does have some manufacturing tolerances embedded...
by Russ Elliott
Fri May 12, 2017 12:09 am
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 27909

Re: P4 vs S4 - Pro's and con's

Martin Wynne wrote:There should be NO specified maximum on check gauge. Check gauge is a minimum value only. 18.15mm min for P4.

If I was manufacturing a bit of metal called a Check Gauge, Martin, what would you state on the drawing?

cg-query.png
cg-query.png (1.85 KiB) Viewed 2849 times
by Russ Elliott
Thu May 11, 2017 2:17 pm
Forum: Track and Turnouts
Topic: P4 vs S4 - Pro's and con's
Replies: 164
Views: 27909

Re: P4 vs S4 - Pro's and con's

But you have not yet confirmed if Martin is correct, and that whatever dimensions we are talking about BBmax+EF is always no greater than the CG, even by the tiniest "wafer thin" (Mr Creosote) amount in 4mm scale of 0.01mm, and I am in some doubt as to whether you agree with him. I know w...
by Russ Elliott
Thu May 11, 2017 1:22 pm
Forum: Chassis and Suspensions
Topic: Help with a Brassmasters 4F
Replies: 51
Views: 7984

Re: Help with a Brassmasters 4F

The photo of the buffer bodies against the gauge would seem to indicate that the loco needs raising 1.0 - 1.5 mm, rather more than a change of wire thickness might provide. Yes. (Hence my previous suggestion.) So if the position of the hornblock in the guide is too low and using thicker wire won't ...
by Russ Elliott
Thu May 11, 2017 12:23 am
Forum: Coaches and NPCS
Topic: GWR Dean period coach panels: corner radii & thicknesseses
Replies: 6
Views: 1804

Re: GWR Dean period coach panels: corner radii & thicknesseses

Andrew - here are some notes. The 1/4" dimension for the side to the glass of a quarterlight/longlight is estimated, and probably varied a bit between eras. The shape of the 'sloping' bit of the bolection is more complicated than that sketched here - you know what I mean. Most of these dimensio...
by Russ Elliott
Wed May 10, 2017 11:34 am
Forum: Track and Turnouts
Topic: Conductor Rail Supports Kit
Replies: 51
Views: 7424

Re: Conductor Rail Supports Kit

It would also appear from this discussion that the SR mainly used 100 bl/yard or 106 bl/ yard conductor rail, am I right? Historically, yes. I've worked out that when using 100 or 106 bl rail the Southern Railway and the Southern Region CRS were higher that the LT ones, so is there any easy way of ...

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