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KMCE

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  • 7 months later...

It's been quite a while since I posted in here, but then I suppose I had other stuff to do!!

I was reading through Iain RIce's book on chassis construction and realised that I needed to make some changes to the 2-2-2.  I was using a single centre PB spring for the front axle, while the book recommends two.  I also removed a lot of side play in the rear axle and reduced side play in the front axle which greatly helped balance and general running.

As has been mentioned before, I have moved to RC for loco power, and given the batteries in question are 3.7V, I have also changed motors (to remove the voltage regulators), and in this instance gearboxes also.  I bought a few N20 gearmotors with various gear reductions, in this case 300, 200 & 100 RPM at the shaft - this then required some form of bevel gears to transfer this shaft speed to the axle.  Some brass bevel gears were bought and amended to fit the shaft (1/8" rather than 3mm as bought) and a motor /gearbox mount designed and cut on the CNC. This last addition solved a lot of problems with mounting the gearmotor & ensures consistent meshing of gears.  The different shaft speeds were to work out which gearmotor provided the smoothest slow speed running - this loco (and the prototype) were never designed for high speed mainline running, and given the size of my layouts, would never get up to speed anyway!

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Gearmotor, bevel gears & motor mounting on display here, along with the on/off & charging port.

 

What is really nice about these gearmotors is that they are very compact and can be mounted nicely between the frames (in 21mm anyway) so that it does not take up cab space.  The battery and receiver were added, which for now do sit up in the cab, but there is a little more space in the firebox area, which may hide them in the future.  All of this clears space in the boiler area for a rather large lump of lead; this little loco needs quite a bit of weight over the drivers to avoid wheelspin.

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Cables between switch and battery & switch and receiver are a little long, but can easily be shortened once the chassis is painted & I can make the final installation.

 

So with the mods made to motor & gearbox, plus the few suggestions from the Iain Rice book, the loco runs very well and negotiates points and other track impediments rather well.  It runs smoothly without wheel spin, and as this was never designed to haul a long train of heavy coaches, should do just fine on my small layouts.

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Still more work to do, as boiler bands, handrails, brakes, etc still need finishing.  I may paint the chassis once the brake work is done to get it complete and then focus on the body afterwards.  Getting everything into this loco, plus sufficient weight for adhesion has taken some time and planning, albeit with some revisions where the first attempt was not quite right, but I think I am on the final stretch.

 

All for now.  More as progress and energy levels permit.

Ken

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  • 3 months later...
  • 1 month later...

So, the horse box proved to need a little more work than anticipated, but I think we have got it sorted now.  Some problems with the printer have cause a backlog, but whilst not quite there, the prints are finally of a quality that can be shown.

What was not initially evident was that the Horsebox had a beehive type louvre on the roof - I initially mistook this as a building behind the wagon in the photo I was using, but sight of some other photos, it appears was part of the roof, and in this case is the only roof decoration.

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Some detailing needed such as door handles, brake linkages, a tidy up and then off to the paint shop. 

 

The problems with the printer caused a backlog in output from the wagon works, but now that some semblance of normality has returned, we can build the latest wagons.

First up, a basic carriage truck which were used in numbers on the network, but given the simplicity of them, I'm not aware of any definitive photos of a DSER version, so I used some licence to create my own.  As simple short wheel base with a single plank siding with drop down hinges on all sides.  Simple but needed in the fleet.

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Slight print error on the brake handle due to a lack of support during printing, easily fixed prior to painting; no real need to print another one just to fix this error.

 

From reading through Shepherd & Beesley book on the DSER it appears timber wagons were in big demand, and while new units were ordered from the UK makers, quite a few were repurposed from mineral wagons.  I have no photos of timber wagons from the DSER era, but searches through the HRMS records showed quite a few timber wagons made for other railways across the various networks, and the short wheel version all appear to be bolster wagons to be run in pairs.  It seams reasonable that the DSER would do the same, considering they were using repurposed mineral wagons; for me, it makes for a reasonable supposition. 

So with a little bit of work we get these:

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Obviously these wagons will be permanently tethered together to run as a pair with a timber load - haven't decided if I will use unfinished logs or go with the machined lengths, I can decide later once painting is complete.

 

So this pent up demand from the workshop has added a few new wagons to the fleet, much to managements relief!!

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The brake van at the end will need its own write up as it involves multiple materials.  It is much needed as I only have one DSER brakevan at present and given the wagon stock has increased, there will be more demand on brakevans to make up trains.

 

More later as time and energy permits.

Ken

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35 minutes ago, David Holman said:

Amazing models. 3D printing is definitely going up in the world and the skills required to produce these are every bit as good as any scratchbuilding.

Yes with these 8k printers they are even better than IMP for resolution. Excellent results @KMCE and excellent CAD work.

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  • 3 weeks later...
Posted (edited)

Now that the printer is almost behaving itself again (its taken a whole (1L) bottle of resin and many dumped models to the the settings dialled in correctly), I can finally get some more models printed.  I have been working on coaches to add to those I already have.  I figured I needed another brake coach and a compo coach would be good also, so straight from the printer and without further ado:

First up:

1st / Lav / 3rd built in 1907 at the Grand Canal St. Works as No. 15, converted to all first in 1922 as No.25, and finally re converted to 1st / Lav / 3d in 1936 as No.30 - finally withdrawn in 1949.  33'6" over headstocks with 11' wheel bases

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And, no, your eyes are not deceiving you, there is a slight bow in the roof.  This element is printed separately from the body to allow access to the interior; the net result is that it bows slightly when curing.  Most of the bowing has reduced overnight, but the final curve can be encouraged with a hair dryer.  This material responds well to gentle heat and can be tweaked to form another shape, which it will hold once cool.

This coach is interesting in that it has vertical timber panelling with modest panelling lines along the sides.  Roof tank for toilet is a nice touch. 

So some work to do in providing a brass chassis, adding handrails for the end steps, brake details, door handles and asscoated fixed pulls.  Hopefully that should not take too long.

 

Second Up:

2nd Class, built in 1875 at Metropolitan Carriage Works as No. 57 and converted 3rd Brake in 1914 as No. 70, - finally withdrawn in 1926.  31' 0" over headstocks with 9' 6" wheel bases

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Again same issue with the roof on this one - easily sorted.

This is the Mk4 version of this coach as I have had quite a few fails due to resin quality, resin settings & some design flaws, however I think we have got there this time.

This one also needs a brass chassis, brake details, door handle and associated pulls before going to the paint shop.

 

 

And for giggles, a proposed suburban branch train to be seen somewhere down the Shillelagh Branch line - probably stopping at Coat's Bridge!!

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With a nice tank loco up front we will have the 1st / Lav / 3rd, followed by the 3rd Brake providing the braking power with a horse box tagged on for the gentry - perhaps coming back from the RDS show?

After much trial and error (many errors), I'm very pleased at how these have turned out.  Looking forward to getting them on the bench to get some running gear underneath and then into the spray shop for painting - well, once energy levels will permit.

 

Anyway, all for now.

Ken

 

Edited by KMCE
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A little bit further on with the 3rd Brake coach.  Got some time to squeeze in a compensated chassis with a floating centre axle - I may need to add a little weight to the centre axle supports to ensure it remains put on the rails when negotiating points, but I can get to that as required.  Brake actuators were added along with the interconnecting rods to the printed brake equipment - easier to show than explain!!

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All tidied away nicely, and almost unnoticeable when the coach is the right way, but I know they are there!

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Brake hoses, couplings, Gas tank, door handles and associated handrails to be added, but coming together rather well.

 

Anyway, all for now.

Ken

 

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4 hours ago, Flying Snail said:

is the brass chassis something of your own design

No - I use one and a half compensated wagon chassis kits as supplied by SSM.  I have tried many variations of compensated chassis but have found this one to be the best; easy to set up and works every time.  Challenge here was getting into the limited space between the frames - I had to beef up the frames to reduce the warping tendencies in the 3D print, which in turn reduced the internal space for the chassis.  A little bit of grinding was needed to ensure both the rocking element and middle axle could move freely.

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