Where we are now

It seem a very long time since I last posted to the blog, so maybe it’s time to run through what I have been doing since the beginning of the year.

Locos

There are three loco kits in preparation, the S&D Scottie and two unannounced Midland Railway Johnsons. All are well advanced with most of the design work finished on the Scottie and one of the others. There is one major test still to do and if this is successful I expect the Scottie to be available by Railwells this year and one, if not two, of the MR locos by Scalefourum.

I will update the web site to reflect this when I have more information on pricing and availability.

Coaches

The supply of the nylon coach underframes has been a nightmare this year. Shapeways, who manufacture these, changed their way of checking the uploaded drawings which resulted in models that had printed in the past being rejected, and because only the first fault was reported, I soon found myself in a seeming endless cycle of error correction and rejection. In the end I gave up and withdrew all these underframes from the website. Recently I have found a local resin caster who is willing to experiment with some my ideas, so the plan is to remodels all the underframes and bogies in a resilient resin. This will improve the surface finish and maybe lower the price.

I have the first prints of the MET Dreadnoughts bodies, so it is likely that these will be used as guinea pigs for a wider range of bogies and underframes. I would expect these coaches to be available certainly by Scalefourum this year.

The long term plan is to convert those kits that have been produce in the past as etchings to either all or part resin kits. The problem with this approach is that as the patterns and moulds for the resin are relatively expensive, I will have to be careful about which coaches get this treatment. My gut feeling is to go for specialist stock, such as push & pull units and restaurant cars, but I am always open to suggestions.

In the mean time all the etchings listed in the old lists are still available at the quoted prices.

Wagons

With so many new wagons listed, I determined that what was needed was a much quicker way of generating 3D models than painstakingly drawing them in CAD. So a start was made on writing a script that could generate the required 3D information. I made a good start and managed to get the headstocks, solebars and w-irons working, but them ‘other stuff’ intervened and now I have to go back to the scripts and try and work out why it did it all that way…
However I have patterns for three NSR wagons ready to go for casting in the next couple of weeks and two more close to being finished.

Wheels

The wheels have been on a back burner for a while, mainly because I have had increasing doubts about the material that I have been using. By it’s nature it is somewhat brittle, and because it is a photopolymer it will tend to age and become more brittle over time. Ideally the wheels should be made in a tougher material than the one used at present. It it is likely that this will be possible with a resin and work will start soon to find a way of producing suitable moulds.

It has been one of my long term aims to be able to to produce ready to run locos in P4 and EM as well as OO, so being able to make prototypical wheels is a fundamental part of that ambition.

All in all the first part of 2013 has been disappointing and frustrating. Let’s hope that the change in the weather will see more of the pile of part finish projects brought to fruition.

A little closer

Prompted by a mega thread on RMweb (and an enthusiastic customer) I’ve completed the drawings for a set of loco frames that, it’s hoped, will make like much easier for those who want rarer locos but who don’t enjoy assembling etched brass kits.

The renderings represent a MR 1F 0-6-0T which is part of a batch of MR and S&D Johnson kits that will be put into production in the first half of next year. The main part of the frames is cast in brass and the keeper is sintered nylon. Etched phosphor-bronze strips are attached to the keeper to for the pickups. This particular set of frames is a test piece to test the fit of the keeper, it is intended that the frames that are included in kits will have the footplate and splashers included in the cast. With luck this set will be ready before Christmas and then work can start on the production frames.

Constructive comment welcome.

MR 1F 0-6-0T cast frames.

Components of cast frames for a MR 1F 0-6-0T

Loco Bodies

There has been a discussion of 3d printed loco bodies in this thread with interesting contributions from Atso and Atlantic 3279. Experience with the O4/5 body has shown that, not only will a raw 3d print be expensive and need a lot of finishing, but that the machines which these prints are made on are not always consistent in what they produce. I have come to the realisation to the best way to produce loco bodies is to cast them in resin from 3d printed patterns. This will give major advantages e.g.

Lower prices and/or better margins.
‘Ready to paint’ finish.

However there are some disadvantages.

Longer lead times.
Batch sizes will be larger.
The holes for fixing handrails have to be drilled by the modeller.
Some parts e.g. backheads, cab fittings and possibly smokebox fronts will have to be made separately.

In view of the need to order resin castings in batches I am going to need some, maybe 12-15, pre-orders before they are put into production.

However this is all in the future, as most of my design time of the next few months will be directed towards producing drawings of frames for the loco and loco frame kits that have already been announced, together with some others that have been promised but not announced on the website. In all I am aiming to have about a dozen done by Christmas. Renderings of these drawings and forthcoming wagon and coach kits will be posted on my Newsletter as they are finished.

To sign up for the newletter, if you haven’t already, go to this page

The Finescale Illusion

Every once in a while a modeller comes up with a brilliant idea to improve finescale loco kits. All he has to do, he thinks, is to make a kit which consists of exact scale replicas of all the parts of his chosen machine and people will flock to buy it. So he invests in a new computer, CAD software, buys some GA drawings from the NRM and spends a not inconsiderable time drawing all the components at full scale. In time etchings and other components are produced, a test build is done and photos taken of it. And eventually boxes are filled, orders received, cheques cashed and everyone is happy.

Except…..

As soon as the first adopters start work on building their models, then it is obvious that there is a problem. And the reason is not hard to find. Full sized mainline locos are designed to negotiate a minimum 4½ chain radius curve dead slow. Running lines less than 10 chains radius have to be fitted with checkrails. That is 1.2 m (3’11”) and 2.6 m (8’8”) in 4 mm scale. There are just not that many people with this amount of space, most layouts seem to have a minimum radius somewhere between 3 and 4 feet. Kit designers who ignore this fact leave the builder to face an awkward and time consuming rebuild of the frames just to enable the loco to run on his layout. Of course the model will look the part and many will be taken in by the photographs, without bothering to ask how easy it is to build or how well it will run. The problem goes much deeper than a few difficult kits. There is a perception amongst many modellers that finescale, and in particular P4 modelling is more difficult, more hassle, than the modelling they indulge in. For the most part this perception has little basis in reality, rolling stock is the same in all 4 mm scale gauges, track work is not very much more difficult to build in P4 than in OO, but loco kits? It seems to me that whenever a new ‘museum quality’ loco kit comes on the market, one look at the sheets of etching and instructions is enough to put off a large proportion of potential new recruits to finescale modelling.

There is a widespread belief amongst many in the hobby that players in the cottage industry part of the hobby should not criticised. It is particularly strong among magazine editors and those who run internet forums and does a disservice to both modellers and manufacturers. For modellers there is a well known phenomenon of the ‘maturing cabinet’. This is where a kit is bought and the modeller does not have enough confidence in his building skills and so it remains unbuilt. Or worse, the kit is started and work stops when some problem in the construction which stems from a design flaw in the kit is interpreted as a lack of skill by the builder. Given that the vast majority of complex kits are not going to be finished for many years this can lead the more naïve manufacturers into perpetuating less than ideal design work long after it could have been improved. In addition cynical manufacturers have been known to exploit the fact that kits are not built quickly, in order to put on the market products which have had very little chance of ever being able to be built.

One of the things I was taught at Art College was that the only way to improve your design work was to be able to handle criticism. That meant not only to take cognisance of criticism of your own work but also to be able to make constructive criticism of that of others. In this way, so the theory went, everyone would use the collective wisdom of the group to improve their designs. In the model railway world, criticism, constructive or otherwise, is positively frowned upon. This leaves any manufacturer with very little incentive to improve designs or innovate. What is not helpful is ‘the chorus’ with their ill-informed praise for just about anything that comes on the market. Comments from those who are confident enough to be able to work through any problems they find are only useful in catching execution errors. The information that is most useful to the kit designer is why and at what point did this person give up on this kit, because this can point to errors in the design philosophy. Armed with such information a designer can then usefully modify his work to mitigate such failures. If there is any truth in the belief, common in the trade, that only about 20% of kits ever get finished, then there would seem to be a massive deficit in the understanding that designers and manufacturers have in the ability of their customers to deal with problems involved in building their kits.

In a climate where criticism of products is freely given and acted on by manufacturers, then, contrary to received opinion, those manufacturers who do act on the criticisms will see their sales increase, because if the customers have the confidence that they can build any of the kits they buy in a reasonable time, they are more likely to make repeat purchases.

Just as one door opens…………

This is a quote from a posting on the Shapeways forum:-

”’
WSF is just Nylon 12 – I believe since Shapeways use EOS machines it’s
probably PA2200. I imagine though that right now PA2200 is becoming
very hard to come by for Shapeways since a factory explosion in Germany
about 2 months ago decimated worldwide stocks of Nylon 12 for all
industries, and afaik, EOS has now completely run out of PA2200.
”’

There has been no response from Shapeways about this. So I don’t know what the situation will be, whether they will offer a substitute material or just withdraw WSF. It is likely that the German factory will be out of production until around October, so the supply of the new underframes & bogies is going to be uncertain until then.

Another Dead End

After telling everyone I met at S4N that I was intending to produce coach kits consisting of etched sides and ends, and printed seat units, roofs underframes and bogies, I though it would be a good idea to get some costings. So using the LMS all third that has served as a guinea pig I drew a new seat/floor unit and uploaded to Shapeways to check the price. Unfortunately the total retail price came out at around £100. This I considered to be too much, so I have reluctantly had to shelve the whole idea. So all my future bogie coach kit are going to have resin bodies and roofs

Coach kits

I’ve had a prototype of one of the promised coach kits to work on over the last couple of weeks. It has taught me some interesting things about the sintered nylon I used. Basically while it will make acceptable underframes and roofs, getting the good finish needed for a coach side is all but impossible. So it’s one step back and one to the right and I’ll have to go off in a slightly different direction until the technology catchs up with me.

I had an enquiry this morning about some SECR coaches, and it may be worth posting much of my reply here to show everyone the way I’m thinking.

I’m working on a system to provide complete kits for most of the etched
coaches in the 4mm catalogue. This will consist of the body etch, more
or less as supplied at the moment, a roof, a floor/seat unit and one
piece underframes and bogies. Leaving the modeller only to supply
wheels, paint, glue etc. The price is likely to be in the region of
£70-80 depending on the prototype.

I’m also working on a alternative version of this system that uses cast
resin sides and ends instead of the brass ones. This has the potential
to be offered painted and ready to run, but is somewhat further away.

This latter item is the way I’m intending to produce the lits advertised in the coach kit section of the main website.

BUF025 GCR 60' Underframe

Brighton Bogie

New Stuff

Instead of scratching my head trying to thing something clever to write, i’ve decided to take the easy way out and just post pictures of things I’ve been working in recently.

Bridge Plates

Bridge Plate Rendering

These are for a skew bridge on a customer’s new layout. The dimensions are 35 x 7 x 2 scale feet (140 x 28 x 8 mm in 4 mm scale) They are being produce at the moment an the price will be £64 for a pair.
Similar bridge plates can be produced with different dimensions. Please ask for details.

LNER O4/5 Boiler
BLK0500/5 LNER O4/5 boiler/cab 4
BLK0500/5 LNER O4/5 boiler/cab 3
BLK0500/5 LNER O4/5 boiler/cab 2
BLK0500/5 LNER O4/5 boiler/cab 1
This is a complete replacement for the boiler/cab unit on a Bachmann Robinson O4 2-8-0. This on will produce the O4/5 variant of which there were 9 examples lasting from 1932 to 1959. These boilers can be produced with or without firebox hand holes and washout plugs and with or without vacuum ejectors.
The prototype drawing is finished and will be sent for production shortly. The expected price will be about £50.
Other replacement units are contemplated, both for the Robinson O4 and other Bachmann locos.

All the pieces on this page will be supplied unpainted and direct from the manufacturers.

Six Wheeled Coaches

A recent thread on the Scalefour Society Forum has reminded me that there is a much easier solution to the ‘side-play on the middle wheel’ problem. On the original full sized coaches the springs for the centre axle were supported in long j-hangers with either with links or rods and rubber secondary springs. The axleboxes were modified so they and the axle could move axially in the w-irons. We can’t actually make the axleboxes move like this on models but we can get very close to it. This is how:-

Materials Needed

A pair of wheels, almost any make will do.
A length of brass tube 2 mm OD x 1 mm ID x 22 mm long, for P4 or EM, or 20 mm long for OO
One ExactoScale pin-point axle 1mm diameter

Method

Cut the tube to length and make sure that both the outer an inner edges are well de-burred.
Remove the wheels from their axle and mount them on the brass tube. Check and adjust the back-to-back.
Slip the mounted wheels onto the 1mm axle and mount the combined axle in the sprung w-iron in the usual way.

There you have it. Quick, simple and without the usual contraptions or inside bearings. THis method will give enough side-play for your six-wheeler to go round any curve which doesn’t produce buffer locking.