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| Posted: Sat Feb 13th, 2021 11:05 pm |
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1st Post |
tusharpc
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I recently completed the build of a 4-wheel /2-axle tank car denoted TP or TK,
and used extensively to carry petroleum and allied oil products on the Indian Railways.
These were once the workhorse of the majority of the liquid freight on the Indian Railways,
and have only recently been retired for scrap.
The model has primarily been built out of home etched brass,
and few detail parts that were 3D resin-printed.
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| Posted: Sat Feb 13th, 2021 11:06 pm |
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2nd Post |
tusharpc
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The prototype:
The completed model:
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| Posted: Sat Feb 13th, 2021 11:17 pm |
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3rd Post |
tusharpc
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The body is mostly 0.01” (0.254 mm) sheet brass from K&S Metals,
that was etched using a unique masking technique.
A few small high detail parts were produced using a resin 3D printer,
called Elegoo Mars Pro 2, that I’ve recently acquired.
I scoured through several online documents and maintenance manuals,
to define dimensions in HO scale (1:87)
I’m well aware of the HO track gauge and IR prototype broad gauge discrepancy.
But in the interest of compatibility I choose to ignore the track gauge discrepancy,
and focus on the model overall.
Once a few sketches were done, the plans were designed in 2D in Auto-CAD.
Most body shapes were flattened to their 2D forms, and then drafted.
eg. the tank rolls out to a flat rectangle.
Small detailed parts like, leaf springs, bearings for the axles and tanker caps,
were also designed and drafted in 3D in Auto-CAD.
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| Posted: Sun Feb 14th, 2021 01:25 am |
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4th Post |
Nice Guy Eddie
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Hi Tushar
Good to see you Posting here on Freerails.
Fantastic looking model building & design work.
Great to see your prototype & model photos side by side.
Our dedicated Freerails tankcar fans, are sure to love it !
The very long Page scroll, was caused by the Auto-CAD image in Post-3.
Once in a very rare blue moon, we get an image that appears Posted like that.
Your other 2 Posted JPG photos, as you can see, are both appearing just fine.
It may be how you did it, or the image itself, or maybe an odd connection ?
In any case, we are able to optimize such things, for best presentation.
What was the file format & size of the image, was it a PNG or large Bitmap ?
Have another go at Posting it, we can always move it or erase it if needed.
All the best
Eddie
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" We Got Places All Over The Place "
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| Posted: Sun Feb 14th, 2021 02:41 am |
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5th Post |
tusharpc
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Thanks For your prompt reply Eddie.
Not sure what went wrong, but seems it's proper now ?
Looks like the Auto-CAD screenshot is gone,
if you have to, feel free to delete the whole post.
I've learned the hard way to save the text and images offline before posting!
The Auto-CAD image was a screenshot in JPG format (45.5 Kb) similar to the rest.
So I'm confused what caused the issue.
I will try once again.
I will go ahead and add more pictures, and a write up of the build process.
Thanks, Tushar
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| Posted: Sun Feb 14th, 2021 02:53 am |
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6th Post |
Nice Guy Eddie
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Hi Tushar
It's been rarely, that an image appears as text/characters like that.
So rarely in fact, that we can't say what caused it for certain.
It will probably turn out fine when re-Posted.
Generally speaking, it is good to make multiple Posts anyway,
rather than spending hours, typing it all down in 1 Post,
& then finding your Browser dumps it all !
If a single Post even contains as little as 1 photo & description,
then Pages are kept to a sensible size & load FAST as well.
Freerails is often complimented, on its SPEED in loading Pages,
by many Members, who are still on copper connection Internet.
Not having a zillion needless plugins, Facebook trash & YouTube boxes,
of course helps, seeing trains & not loads of ads. is also a relief !
Posts & new Pages are FREE on Freerails,
& don't even waste paper !
Probably a computer error ?
As they say !
Eddie
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" We Got Places All Over The Place "
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| Posted: Sun Feb 14th, 2021 05:17 pm |
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7th Post |
tusharpc
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Ha good one!
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| Posted: Sun Feb 14th, 2021 05:28 pm |
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8th Post |
tusharpc
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Auto-CAD design screenshot.
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| Posted: Sun Feb 14th, 2021 05:33 pm |
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9th Post |
tusharpc
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Build process:
There is now a fork in the build process,
for the majority brass parts,
and the 3D printed parts.
Firstly...
Brass Etching:
Vinyl mask.
Once the 2D design was finalized,
it was exported to small desktop vinyl cutter Silhoutte portrait 2
(This has been extensively spoken about in the Thread: Paper cutting machines.)
The vinyl cutter essentially plots the design,
but instead of ink, uses a blade to slice through an adhesive backed vinyl sheet,
that will act as a kind of mask (similar to masking tape).
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| Posted: Sun Feb 14th, 2021 05:37 pm |
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10th Post |
tusharpc
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Vinyl is ‘weeded’ to expose the brass that is to be ‘etched’ away’.
Once cut and weeded,
this is transferred to the prepped brass sheet using a ‘transfer paper’.
For prepping the brass sheet is cleaned,
with Isopropyl alcohol and a very high grit sand paper.
This is ‘one side etch’,
therefore the other side is simply covered by the same sheet of vinyl.
The end goal is to etch away the parts that are not required,
the parts needed remain protected by the vinyl sheet during the etching process.
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