Search found 34 matches

by bobwallison
Tue Nov 12, 2019 12:56 pm
Forum: Starting in P4
Topic: Making a Start - The Peak District Midland / Monsal Dale pre 1903
Replies: 1049
Views: 136833

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

I am curious to canvas peoples opinion of closed cell rigid insulation as a track base? Tim, as stated by Flymo, Gordon Gravett's articles show the way but it is crucial that you use the right stuff - and it ain't Celotex! There seem to be three types of rigid insulation commonly available: Expande...
by bobwallison
Tue Nov 12, 2019 11:40 am
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 28
Views: 1534

Re: Plywood disaster

Apologies for going off topic again, but I am failing to understand why silent running is seen as something of a holy grail. Hi Tim: noise and underlay seem inextricably linked with the form of baseboard construction, so I reckon your comments are very much on-topic. I think one's perception of mod...
by bobwallison
Mon Nov 11, 2019 6:29 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 28
Views: 1534

Re: Plywood disaster

My layout, built 6 or 7 years ago, is entirely 12mm MDF, supported at 300mm centres throughout, and has shown no sign of warping, either on the bare boards, or where foam is attached to it (with spray carpet adhesive). My experience of 12mm MDF is the same as Allan's - no warping over a period of s...
by bobwallison
Mon Nov 11, 2019 3:14 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 28
Views: 1534

Re: Plywood disaster

Thanks David. I always wear a face mask when cutting MDF and have recently started to wear a lab coat as well, to keep the dust out of my clothes.

Regards,
Bob
by bobwallison
Mon Nov 11, 2019 1:17 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 28
Views: 1534

Re: Plywood disaster

Thanks for the replies. Tim - I use L-girder construction as per American practice; cross beams and risers to support the trackbed are at about 300mm centres. My model is set around Buxton in the Peak District - all cuttings, embankments, and flying junctions so a traditional British flat top basebo...
by bobwallison
Sun Nov 10, 2019 6:32 pm
Forum: Baseboards and Carpentry
Topic: Plywood disaster
Replies: 28
Views: 1534

Plywood disaster

I finally bit the bullet a few weeks back and invested in some quality birch ply, 9mm thick, Grade B/B, lovely stuff. The trackbed was cut to shape and Febond adhesive applied to the top surface (that's the flexible PVA stuff recommended by Norman Solomon) followed by a layer of Exactoscale's 3mm fo...
by bobwallison
Sun Oct 27, 2019 6:09 pm
Forum: Layouts and Operations
Topic: Track Planning & Layout Ideas - New Builds Started
Replies: 205
Views: 47047

Re: Track Planning & Layout Ideas - New Builds Started

I know most of you will not care about this, mainly due to it being 00 I'm not sure about that - good modelling is good modelling in any gauge. There may be a few die-hards who cannot see beyond the narrow gauge and deep flanges, and so fail to appreciate the other merits of the better 00 gauge lay...
by bobwallison
Sun Oct 27, 2019 5:43 pm
Forum: CHEAG
Topic: Meeting report for October
Replies: 0
Views: 546

Meeting report for October

It’s more than three years since there was any activity on the CHEAG thread so visitors to the site may be forgiven for thinking that the group is defunct. Not at all! We still meet regularly on the second Thursday of the month at the Coach and Horses PH in Newport, Essex, where we have a small room...
by bobwallison
Fri Oct 18, 2019 3:55 pm
Forum: Layouts and Operations
Topic: Brimsdown-The last grand project.
Replies: 301
Views: 43979

Re: Brimsdown-The last grand project.

Hi guys.

Thanks for all the responses - plenty of options there to mull over. Problems with Tortoise switches duly noted.

I think in the short term I'll ask for replacements under DCC's lifetime guarantee, then I'll have a better idea of noise levels from current production units.

Regards,
Bob
by bobwallison
Tue Oct 15, 2019 9:49 am
Forum: Layouts and Operations
Topic: Brimsdown-The last grand project.
Replies: 301
Views: 43979

Re: Brimsdown-The last grand project.

Hi Tony. I would be interested to hear how you get on with the Cobalt motors. I bought a pack of 12 not long after they were introduced and three have been taken out of service after very moderate use because the gears are slipping. This is a known problem, but still a frustrating one. What is not w...
by bobwallison
Sat Oct 05, 2019 8:05 am
Forum: John Donnelly
Topic: Wagons for South Pelaw Junction
Replies: 117
Views: 21278

Re: Wagons for South Pelaw Junction

John, I am fairly sure that Gibson's OO wheels are the same profile as his EM gauge wheels, and we know from other threads that a few people have successfully re-gauged their EM wheels to run on P4 track. So if there is absolutely no way to remove the OO wheels without destroying them, my suggestion...
by bobwallison
Mon Sep 02, 2019 2:54 pm
Forum: Guest Book
Topic: Chassis kits for CSB
Replies: 26
Views: 2193

Re: Chassis kits for CSB

No amount of theory will change our minds, practical demonstration might. So do it and show it off :) . Hear, hear, especially when the theory takes no account of all the additional factors that come into play for moving vehicles, as mentioned above. (OK, I will agree with Andy that they are additi...
by bobwallison
Sat Aug 31, 2019 6:10 pm
Forum: Guest Book
Topic: Chassis kits for CSB
Replies: 26
Views: 2193

Re: Chassis kits for CSB

In the case of the x-8-x, I'm actually proposing an obvious CSB problem with a no brainer CSB fix. I don't see how that is at all controversial? The clue is in the quote I included in my previous post, where you claim as "a basic proven fact" that equalising suspension does not dynamicall...
by bobwallison
Wed Aug 14, 2019 4:35 pm
Forum: Product Information
Topic: Wizard Models
Replies: 60
Views: 4148

Wizard Models

Has anyone else seen the notice on Wizard's news page to the effect that they will not be attending any more shows after Railex 2020? :(

Maybe it's been there a while, but I have only just noticed it. Best take more care than usual with my shopping list next April.

Regards,
Bob
by bobwallison
Mon Aug 12, 2019 12:31 pm
Forum: Guest Book
Topic: Chassis kits for CSB
Replies: 26
Views: 2193

Re: Chassis kits for CSB

Any form of wheel springing suspension statically and dynamically alters the weight carried on the wheel when going over uneven, bumpy or twisted track. (Hooke's Law). Correctly designed wheel equalizing suspension does not. Completely agree in the case of a vehicle at rest on uneven track, but wha...
by bobwallison
Wed Jul 17, 2019 8:13 am
Forum: Starting in P4
Topic: Track Laying
Replies: 32
Views: 2957

Re: Track Laying

So in summary, Paul: 1. Proper MEK, as in methyl ethyl ketone (common name: Butanone) Is exactly the right chemical to use. Mek-pak as sold by Slaters/Carrs/Precision Paints is not, because it is no longer MEK. 2. Set the rail and chairs in the right place and push down gently while you touch a brus...
by bobwallison
Fri Jul 12, 2019 3:42 pm
Forum: Exhibitions
Topic: Scaleforum 2019
Replies: 249
Views: 23028

Re: Scaleforum 2019

I had been quite seriously thinking of going, but having read the programme I feel that there's not an awful lot of interest to me, and certainly not enough to justify the journey and expense. I do think that the format is getting just a bit "same old, same old" and that it needs refreshi...
by bobwallison
Thu Apr 18, 2019 5:02 pm
Forum: Track and Turnouts
Topic: Crossing Vee Jig
Replies: 26
Views: 4094

Re: Crossing Vee Jig

Very elegant method Bob :thumb ….or you could try Baron von Harrap's way, which ruffles feathers but works a treat! https://www.rmweb.co.uk/community/index.php?/topic/37678-handbuilt-track/page/2/ Steve Thanks Steve. I tried Brian's method a while ago but I'm afraid it didn't work for me. Maybe I'l...
by bobwallison
Thu Apr 18, 2019 4:57 pm
Forum: Track and Turnouts
Topic: rail/wheel profile - prototype has problems too
Replies: 22
Views: 2464

Re: rail/wheel profile - prototype has problems too

Oh dear. So any passenger-carrying track of radius less than 8.5 feet in 4mm scale needs a check rail! Best reach for that pack of rail I bought a few weeks back.

Bob
by bobwallison
Tue Apr 16, 2019 2:34 pm
Forum: Track and Turnouts
Topic: Crossing Vee Jig
Replies: 26
Views: 4094

Re: Crossing Vee Jig

I agree with Keith about overthinking angles to 0.01 accuracy. In any case, apart from main lines, the prototype featured some real horror-shows when a standard crossing was shoe-horned into a location where it didn't quite match the required geometry. As for the difficulty of filing the rails for c...
by bobwallison
Mon Mar 18, 2019 5:28 pm
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 291
Views: 43491

Re: Crab Comet conversion

Thanks Dave and Philip. I feared that Ultrascale crankpins would require either a different wheel press tool or opening out to 1.3mm after the GW wheelpress had done its bit. With the latter option, I would be concerned that the threaded crankpin hole would throw the drill off centre. So its back to...
by bobwallison
Mon Mar 18, 2019 8:40 am
Forum: Steam Locomotives
Topic: Crab Comet conversion
Replies: 291
Views: 43491

Re: Crab Comet conversion

DaveB,
I like the idea of drilling Gibson wheels to take Ultrascale crankpins, but how then do you get the quartering right? The slot for the crankpins on the GW wheelpress only takes a 14BA screw.
Regards,
Bob
by bobwallison
Tue Feb 12, 2019 7:08 pm
Forum: Product Information
Topic: Chairs and Rail
Replies: 51
Views: 9121

Re: Chairs and Rail

I have just bought a pack of Karlgarin rail from my local model shop, no less. I was in a queue behind someone who was stocking up on Hornby set-track - there's irony for you. First impressions are good. It is crisply rolled in Hi-Ni and without the oil film which seems to contaminate some other man...
by bobwallison
Tue Jan 22, 2019 9:48 am
Forum: Track and Turnouts
Topic: Crossing Vee Jig
Replies: 26
Views: 4094

Re: Crossing Vee Jig

Dave, I have the EBMA jig and use it all the time. It is 1.5mm thick and comes with vee-shaped wedges that are a snug fit in the vee-shaped openings. You use the wedge to hold the rails in the right position both lengthways and vertically while wielding the soldering iron with the other hand, which ...
by bobwallison
Thu Dec 06, 2018 9:20 am
Forum: Guest Book
Topic: DCC Concepts Rolling Road
Replies: 9
Views: 2097

Re: DCC Concepts Rolling Road

Andy, I hope you don't sell all of them for rolling roads, because I would be very interested in the wheel weighing option. What is it with DCC that so much of what they produce turns out to be wide of the mark? 6 bolt fishplates? Point motors that sound like cement mixers, with built in gear slip? ...

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