7 1/4 Inch Gauge LNER N2 Tank Locomotive
Jul 9, 2020 14:06:32 GMT
Jim Scott, RGR 60130, and 14 more like this
Post by n269580 on Jul 9, 2020 14:06:32 GMT
Hi Everybody,
I thought it would be about time to share my little project to fellow model engineers.
I am currently 5 years into my first big venture into 7 1/4. This being a LNER N2 Tank loco 0-6-2, designed, manufactured and constructed
from my own design. Using 3D CAD to produce the locomotive drawings. First from scaling up the Don Young 5-inch version but eventually using full size works drawing.
Quick history on the loco I picked as well. I picked 69580 for two reasons, first: my Grandfather fired the full-size locomotive back in the day.
Second: She was the first loco to carry the British Railways lettering in the correct form + lining but, it’s rarely modelled and I prefer this livery to the other BR ones. (I like black tank locos!)
However, I did not just want to produce a play model but a locomotive as close to scale/prototypical as possible (which you could still play with as well.)
Therefore, I set myself the challenge of producing scaled fittings:
Wakefield Number 7 Steam Lubricators (which pump cyl oil and not dummy)
Working Davies and Metcalfe Number 9 Hot Water Injectors
Working Gresham and Craven Dreadnought Vacuum Ejector
Working Gresham and Craven Combined Steam Valve (including clack valve)
These I believe being the first scaled versions in 7 1/4 ever and all from my design!
Working relationships is great in this hobby as without Adam Cro of Cro Fittings these could not have been produced/cast.
These models would be contrasted using CAD and 3D printed/cast in bronze then machined for the final result.
I am happy to say that the Lubricators and Combined Valves are complete and have been tested. Dreadnought and injectors are currently heading to
me as we speak.
Some of you may call this cheating using 3D technology but without it I would not have been able to produce the detailed model I have today. As quite a few little parts have been printed in stainless as the detail is incredible and saves me a lot of work if I wanted to manufacture them.
But you will be pleased to know I still use lathes, milling machines, blacksmithing, sheet metal and hand fitting to produce/construct the locomotive.
A bit on construction: tanks, bunker and cab all made from stainless as did not want the rust problem but easier to lasercut and weld (getting the hang of TIG welding.)
Boiler was commercially made by Steam Technology as did not want to waste a year making a boiler. Got it in 9 months and engineering is superb so cannot complain. Wheels are castings from the beattie well tank and yes, I had to curve off the spokes!! Horns, axleboxes are a GWR Darts. Smokebox is a key hole shape, rolled from brass sheet.
And there is nothing that can rust inside so it’s either, stainless, copper or brass.
Cylinders/steamchests are a solid block of cast iron machined up and valve gear is correct with Stephenson’s link (piston valves) and rolling lever as per full size.
I would love to tell you how many hours but I guess about 3500 so far and another 6 months to go hopefully.
But with scaled backhead and fittings I hope it draw a few people to her. But with old solid carbide cutters in the side tanks, I hope she will have some grunt as well!!
Although it has been a huge learning curve as I have never done this before, but caught the building bug. Currently designing my next three locomotives 😊
I have tried to keep this brief but if anybody wants anymore information I can easily add to this column or post more photos.
There is so much more to tell but don't want to bore you wonderful people.
But please forgive me if the photos don’t come up but hopefully, they are below. 😊
Check out my Facebook page for more photos if interested.
Many thanks
Bruce Harvey
Again a 24-year-old average model engineer
IMG_2580 by Bruce Harvey, on Flickr
RENDER LOCO 14.01.20 CROPPED by Bruce Harvey, on Flickr
IMG_2086 by Bruce Harvey, on Flickr
IMG_0954 by Bruce Harvey, on Flickr
IMG_0513 by Bruce Harvey, on Flickr
I thought it would be about time to share my little project to fellow model engineers.
I am currently 5 years into my first big venture into 7 1/4. This being a LNER N2 Tank loco 0-6-2, designed, manufactured and constructed
from my own design. Using 3D CAD to produce the locomotive drawings. First from scaling up the Don Young 5-inch version but eventually using full size works drawing.
Quick history on the loco I picked as well. I picked 69580 for two reasons, first: my Grandfather fired the full-size locomotive back in the day.
Second: She was the first loco to carry the British Railways lettering in the correct form + lining but, it’s rarely modelled and I prefer this livery to the other BR ones. (I like black tank locos!)
However, I did not just want to produce a play model but a locomotive as close to scale/prototypical as possible (which you could still play with as well.)
Therefore, I set myself the challenge of producing scaled fittings:
Wakefield Number 7 Steam Lubricators (which pump cyl oil and not dummy)
Working Davies and Metcalfe Number 9 Hot Water Injectors
Working Gresham and Craven Dreadnought Vacuum Ejector
Working Gresham and Craven Combined Steam Valve (including clack valve)
These I believe being the first scaled versions in 7 1/4 ever and all from my design!
Working relationships is great in this hobby as without Adam Cro of Cro Fittings these could not have been produced/cast.
These models would be contrasted using CAD and 3D printed/cast in bronze then machined for the final result.
I am happy to say that the Lubricators and Combined Valves are complete and have been tested. Dreadnought and injectors are currently heading to
me as we speak.
Some of you may call this cheating using 3D technology but without it I would not have been able to produce the detailed model I have today. As quite a few little parts have been printed in stainless as the detail is incredible and saves me a lot of work if I wanted to manufacture them.
But you will be pleased to know I still use lathes, milling machines, blacksmithing, sheet metal and hand fitting to produce/construct the locomotive.
A bit on construction: tanks, bunker and cab all made from stainless as did not want the rust problem but easier to lasercut and weld (getting the hang of TIG welding.)
Boiler was commercially made by Steam Technology as did not want to waste a year making a boiler. Got it in 9 months and engineering is superb so cannot complain. Wheels are castings from the beattie well tank and yes, I had to curve off the spokes!! Horns, axleboxes are a GWR Darts. Smokebox is a key hole shape, rolled from brass sheet.
And there is nothing that can rust inside so it’s either, stainless, copper or brass.
Cylinders/steamchests are a solid block of cast iron machined up and valve gear is correct with Stephenson’s link (piston valves) and rolling lever as per full size.
I would love to tell you how many hours but I guess about 3500 so far and another 6 months to go hopefully.
But with scaled backhead and fittings I hope it draw a few people to her. But with old solid carbide cutters in the side tanks, I hope she will have some grunt as well!!
Although it has been a huge learning curve as I have never done this before, but caught the building bug. Currently designing my next three locomotives 😊
I have tried to keep this brief but if anybody wants anymore information I can easily add to this column or post more photos.
There is so much more to tell but don't want to bore you wonderful people.
But please forgive me if the photos don’t come up but hopefully, they are below. 😊
Check out my Facebook page for more photos if interested.
Many thanks
Bruce Harvey
Again a 24-year-old average model engineer
IMG_2580 by Bruce Harvey, on FlickrRENDER LOCO 14.01.20 CROPPED by Bruce Harvey, on FlickrIMG_2086 by Bruce Harvey, on FlickrIMG_0954 by Bruce Harvey, on FlickrIMG_0513 by Bruce Harvey, on Flickr
Backhead formers are being machined at the moment so once delivered I can create the fake backhead cladding and put most of the fittings in place. But as to weight. With original sized cylinders (we reduced them down a little) she would need to weigh about 1/4 ton!! But we reckon that with the cutter and lead about 300-350 pounds. But beauty of being a tank loco is most weight is over the drivers so should have a lot of traction.
