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My new layout - Kit Bashing - More Practical Help - Your Model Railway Club
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 Posted: Fri Jan 5th, 2018 02:26 am
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BCDR
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Hi Bill,

Thanks. No reason to change the motor, it works fine even although it's an older design. Even under DC. Just goes better under DCC when crawling along at walking pace (plus sound, lights and the ability to have 2 or more locomotives on the same track). Being made in 2000 makes it among the younger of my locomotive stable, the oldest is probably late 1960's-early 1970's. I draw the line at old open frame motors with a 4-5 amp draw current though. Those get replaced with a modern DCC can motor.

On30 does have the advantage of a bit more space to do some detailing.

Nigel



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 Posted: Fri Jan 5th, 2018 08:45 pm
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BCDR
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Hi All,

I got permission to show the picture below. This is a 0-6-4T Forney, built by Porter in 1911, and in use up to 1951 by the Godchaux Sugar Company on their 3'6" narrow gauge system in Louisiana. I was going to use a 2-6-4T arrangement, but what's a pony here or there (or a foot in gauge!). Helps keep the dimensions smaller as well.

The usual assorted clutter on the boiler (sand domes, sand pipes, electricity cables, steam dome, lights steam turbine electricity generator, bell, injectors), and on the other side there would have been an air pump and air reservoir tank for the brakes.

I also found a dimensional diagram for a 0-4-4T Forney built by Baldwin, which will be useful for the boiler, cab and bunker build. Some Archbar trucks (bogies) came today, so no excuses. The boiler diameter was 46", 1:48 scale means a diameter of 0.96". I found some brass pipe joiners in the plumbing section of the local DIY store this morning of almost the same diameter. The driving wheel diameter was 42", 1:48 scale means 0.875", the Bachmann drivers are 0.8", close enough for me. The pistons will require some work. More on that topic shortly.

Blodgit and Fudgit need to get cracking, as they clearly will be stretched to the limits of their incompetence with this one. Less of the procrastination, more of the fabrication.

Nigel



The photograph above is of Godchaux Sugar Company's 0-6-4T #7 Forney, and is reproduced from HawkinsRails.net with the kind permission of Ralph Hawkins, Webmaster.



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 Posted: Sat Jan 6th, 2018 03:40 am
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BCDR
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Hi All,

The question of pistons, gauge and scale (my perennial bugbear) arose early in the build this evening. Which is making me really think about the suitability of a UK donor chassis for the Forney bash. So...

OO trains have a 4mm scale body but run on HO track (16.5mm, nominal 14.5mm back-to-back, although most manufacturers err on the side of caution and use 14-14.3mm). This is an issue if the body dimensions are adhered to. In the case of the 45xx the width over the cylinders was 8' 9.25" (35.08mm in 4mm scale). The width on this model is a scale 9.015' (36.06mm). Why slightly wider than it should be? There is a very practical reason for this - read on. This however means that the cross head guides and cross head/rods have to be angled in towards the wheels because of the narrow gauge wheelbase. In this case by 1.7mm either side. Have a look at the photo to see what I mean.



The amount of room available to bring the pistons in (which will mean removing a section of the saddle where the screw is) is for all intents and purposes zero due to the height of the pins holding the rod on the leading wheels (2.4mm, visible next to the motion bracket on the LHS of the photo below) , and the lateral play in the front wheels (1.15 mm). No wonder Bachmann had to make the cylinder width a bit more than the prototype.



There is enough meat on the center axle to widen the back-to-back by around 0.5mm, not nearly enough.This was definitely a "well I never, would you believe it?" moment. Now I could just bin those pisitons, and replace with some round ones with rectangular valve chests, but they would still stick out like sore thumbs. Same goes for longer pins and spacer washers on the central wheel.

The back-up plan for this chassis was a 6-coupled diesel mechanical with jack-shaft, so it looks like that will be the project for this chassis. I'll be looking for a Bachmann US 0-6-0 chassis, my NBHS should have some at fire-sale prices. If not it's eebygum.

Nigel



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 Posted: Mon Jan 8th, 2018 12:27 am
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BCDR
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Hi All,

After a bit of a think I decided i could live with the geometry of the rods. I weighed the boiler in brass  - ouch! Too much for that small motor. Onto Plan B - PVC tube. 1" diameter, 1/8" walls, internal diameter 3/4", so a tad over-scale compared to the prototype, but not much (0.958" versus 1", 46" versus 48" diameter ). This tubing is rigid, and rated for 480 psi - more than any regular steam engine. Cut to length, slot for the motor, and ready for the smoke box cladding, front, and back-head detailing (not that there was very much). I tried a test fit with a 3D print diesel cab, seems OK. See below. Interested passer-by got into the pictures. The black styrene sheet came today, so this week's project looks like the cab, bunker and frame extension.

Nigel








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 Posted: Sat Jan 13th, 2018 09:48 pm
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Hi All,

Something different while I wait for some items for the Forney build to come. In this class, a Bachmann class 20 diesel into a narrow gauge Bo-Bo heavyweight. The inspiration for this came from the Queensland Railway's diesel hydraulics that were converted to 2' gauge for the sugar cane industry in Australia. My intended layout needs at least one substantial diesel for hauling heavy loads, this fits the bill. I have an ESU sound decoder with the class 20, that will need re-blowing to a Hymec or similar. This actually a PITA, as the decoder will have to go to the UK to have this done. Last time I did this I was going to get dinged import duty and taxes on the value of the decoder (£120), not the re-blow (£15). Might actually easier just to get an ESU select and a generic diesel hydraulic.

First photo's show the body and and chassis of the class 20. I got rid of the Bachmann attempt at a DCC board several years ago, it was rewired with an 8-pin socket and wiring for lights. I only needed the body frame, as the body shell is not tall or wide enough. Five minutes with the fine saw solved that.





Next photo's show the footplate. This was made using 2 pieces of styrene, the first one plain, the other foot-plate tread.






I'll be starting the body this week using the black styrene sheet after some drawing in CorelDraw for the shapes.

Nigel



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 Posted: Sun Jan 14th, 2018 10:11 pm
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Hi All,

One of those "hold on a minute, lad" moments. I assembled the foot plate using white styrene sheet and Humbrol cement (the stuff in the yellow bottle). Something was worrying me about this. This morning I consulted my modeling notes, there it was, Humbrol cement doesn't go that well with white styrene and Bachmann green plastic (as used for body shells). And so came another "well I never, would you believe it!" moment when it popped away from the Bachmann frame with a light touch of the cutting blade. Plus another one of those moments when I realized I'd made it too narrow (scale 7 feet instead of 9 feet).

So today we have footplate version II in black styrene, [Question: How do you see pencil lines on black styrene? You don't, use a white pencil or gel pen.]. I did the end beams while I was at it. Reinforced to handle the coupler pull. There is another pair of side beams to do, along with some steps front and rear. I'll let the cement harden before adding those. Tamiya heavy duty cement was used.

Nigel








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 Posted: Mon Jan 15th, 2018 02:39 pm
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Is there some difference between white and black styrene other than the colour then Nigel ?

Ed



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 Posted: Mon Jan 15th, 2018 09:45 pm
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BCDR
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Hi Ed,

Apart from not requiring undercoat when painting dark railway colors? Yes, it's formulated to be a lot more stable to UV light than the white styrene variety, and supposedly does not go brittle, shrink or deform after a year or so. Subjective observations, but it appears a tad softer, and is easier to cut/snap and bend. Glues up nicely, especially with the Tamiya cement. First try with the material, I'm very pleased so far. Downside is that it only comes in sheets, no rod, angle, I-beam, tubes.

Nigel



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 Posted: Tue Jan 16th, 2018 07:44 am
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Interesting.

All the sheets I have just happen to be black, but your quite right as all the angle, bar and tube I've got are white.

Anyway, back to your critters etc.


Ed




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 Posted: Tue Jan 16th, 2018 03:49 pm
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Hi All,

Back to the critters it is.

A second footplate was cut and glued down, some spacing strips added to the underside of the chassis to raise the height over the wheels ("sky" above the bogies/trucks is a prominent feature of the prototype, difficult with a gear tower model), and exterior buffer plates added. These were reinforced with some plastic engineering blocks I had handy to provide something for the coupler gear to pull against. This will be a surface mount with 2 levels.

The exterior plate and interior plate will provide the space for the access steps. I also levered off those Bachmann plastic covers on the "box" amidships, more on that later.

Some material needs removing from the underside of the MAZAC/ZAMAC chassis, that means taking the the bogie/trucks and gear towers out. The prototype has a Voith transmission and a transfer gearbox positioned in the middle, although most of that would be hidden by the fuel tanks. There are also cardan shafts to the inner driving wheels, and secondary shafts to the out wheels in the bogies.  The brakes are already gone after the conversion to EM, the class 20 archbar needs beefing up a bit, and a representation of the cardan shaft made. The sand boxes need to disappear as well. Looks like a job for those stalwarts of the shop, Blodgit and Fudgit (motto: "by 'eck we can do it, and at no cost", overtime and ale excepted).

If I get permission I'll post a picture of the class. Lots of variation ( location of the fuel tanks, sand boxes, cab design, steps, lights...), so plenty of modeling license.

Nigel

Second footplate added and spacing blocks.


Buffer plate in position, the space is where the steps go. The small cut-out on the inner plate is for a flare in the steps at the bottom.


Reinforcing strips in place to elevate the footplate from the chassis.


"Sky" above the bogies/trucks. Needs more. A job for the big file


Bottom half in place on the chassis. It's long for a critter - almost 9.5". I had to compress a bit compared to the prototype dimensions, faithfully modeling that would mean scratch building a chassis (and running on On2 24" gauge track).





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 Posted: Wed Jan 17th, 2018 03:52 am
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Evening All (well it's evening here),

Bit of hackery (with the hacksaw) and an attack with the big red file removed the blob uerneath as well as some metal above the wheels. Anymore and the chassis will start to get a bit fragile. Goodenuff, painted black and with some underbody details it'll do. I'll even it up with some styene strip.

Nigel








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