Mossys 3D Models

Discussion in 'Workshop Benches' started by Mossy, May 19, 2022.

  1. Mossy

    Mossy A classic grump Yorkshire man Full Member

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    Yeah, just being thick Tom as you say the C's had tenders
     
  2. Rob Pulham

    Rob Pulham Happily making models Staff Member Administrator Feature Contributor

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    I was going to suggest exactly what Tom has, poor research which has never been corrected throughout the life of the kit. Many builders wouldn't question it either.

    And yes please , I have quite a list of NER locos and I bet they are wrong in them all.
    I will investigate and let you know.
     
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  3. Mossy

    Mossy A classic grump Yorkshire man Full Member

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    Rebuilt Filler Cap but now circular

    New Filler Cap.jpg
     
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  4. Rob Pulham

    Rob Pulham Happily making models Staff Member Administrator Feature Contributor

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    Most surprisingly all the kits that I have checked

    N10
    G5
    J71
    J79
    Y7
    All have round fillers. That said the castings in the Y7, J71 and J79 are very basic castings as the kits are quite old and Jim has obviously upgraded the casting in the N10 which I bought new from him. The only one that I forgot to check was the N8/9
     
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  5. Mossy

    Mossy A classic grump Yorkshire man Full Member

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    +#Rob,

    I have a Gladiator N8/9 and it has oval filler tops. So you needs 4 or 5 sets of round Filler tops. I need 2.
     
  6. Mossy

    Mossy A classic grump Yorkshire man Full Member

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    In amongst all the questions and redrawing of the tank filler, I have slowly been progressing with the chassis. To date I have concentrated on the visible furniture on one side of the chassis and the brake gear, which I finally managed to decipher from the GA diagram. Most of the brake gear and spring assemblies won't be visible hidden behind wheels and steps, but I seem to have got a mild dose of Pulhanitest. Even if they can't be seen I know they are there, btw does anyone have a cure for this peculiar affliction?

    At some point fairly soon I need to think about frame spacers, fastenings between the chassis and body, engine mounts etc but not just for now. The most daunting bit is designing some form of bogie for the front and back bogie wheels. The outer two holes in the chassis are just there to remind me it needs doing. It is going to be a fixed 4 coupled engine so I haven't tried to allow for hornblocks or other forms of compensated chassis.

    Temp Chassis.jpg
     
  7. Rob Pulham

    Rob Pulham Happily making models Staff Member Administrator Feature Contributor

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    The one that I forgot about completely is the F8/Class A. I seem to have misplaced it so I will have to look for it.
     
  8. Tom Burnham

    Tom Burnham Full Member

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    Just remembered I have this photo of the NELPG J72 showing the back end of the filler lid and also how the tanks are stayed to the boiler on NER locos.

    P2171464_edited-1.jpg



    Rob,

    The filler lids on the Y7 and J79 are smaller than the standard design used on the larger tank engines.

    Tom.

    NERA 1877-Greyscale version_edited-1.jpg

    NERA 1877-Greyscale version_edited-3.jpg
     
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  9. Mossy

    Mossy A classic grump Yorkshire man Full Member

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    Rob, misplaced an F8 hardly surprising what with 48 un-started kits and at least 2 other all over your work bench I'm sure it will soon turn up.

    Tom, love the boiler stay photo, I have just invented something very nominal which will now require deleting but such is life. More than happy for you to keep firing photos over to keep me on the straight and narrow.
     
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  10. paul_l

    paul_l Staff Member Administrator

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    Suppose the most worrying thing when walking through a minefield is how big the blast will be :facepalm: :avatar:

    Great progress Mossy - with a little help from his friends ...... that would be a good name for a song ..........

    At what point does it become feasable to get them made in lost wax ?

    Paul
     
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  11. Mossy

    Mossy A classic grump Yorkshire man Full Member

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    Paul

    I have never really thought about getting them lost waxed, I suppose the cost depends on how many you doing and who is doing it though it would make them far more robust.
    The ones for sale on LG are £8 a pair. Rob is the man for lost wax castings.

    Progress also due to lots of friends and all help is hugely appreciated even bad minefield jokes.
     
    Last edited: Dec 6, 2022
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  12. Rob Pulham

    Rob Pulham Happily making models Staff Member Administrator Feature Contributor

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    Brilliant, thanks again Tom.
     
  13. Rob Pulham

    Rob Pulham Happily making models Staff Member Administrator Feature Contributor

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    I would have to take the plunge and get them cast to find out how much. It depends on how much brass is used. You would get 4 possibly 6 per sprue which would bring the price down a bit.
     
  14. Mossy

    Mossy A classic grump Yorkshire man Full Member

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    Tom's boiler stay photo has really got me stumped, drawing the actual stay is simple, but how to get the cut through the boiler cladding is foxing me for now. I figure 3 stays per side so 6 in all and all need to be consistent. One serious thought is to chop the boiler in two reducing the number of cuts needed by half and when happy then mirroring the second side. In order to create the cuts I think I need to create a plane at a tangent, which is a function I haven't used before so it's another step into the unknown.

    Another feature I have been looking at and contemplating is creating what I think is called a sniffting valve (but could be wrong). What appears to be the final handrail support on the right side of the smokebox is actually a valve. Creation of the valve should be relatively simple but the hard part is replicating its operating mechanism. The handrail was hollow and ended a few inches short of the valve. An operating rod slid down the inside of the hand rail and connected to the valve. Given I was planning to use .7mm wire for the handrail, how do I do the operating rod. My brain hurts, Dr Moss has recommended an evening off cuddled up to a malt whisky. Not a bad plan.
     
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  15. Tom Burnham

    Tom Burnham Full Member

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    According to the General Arrangement drawing and this photo, there are two tank stays on each side. If you have a look at my previous posting of the Cass O filler lid you can see how the stay is shaped to fit around the circular filler and the rectangular holes in the vertical part of the stay to allow for movement as the boiler expands.

    NERA1450-049_edited-2.jpg

    What you refer to as a "snifting" valve is the blower control valve. On all subsequent locos the blower valve was placed on the left hand-fireman's side of the boiler. In the above photo No. 1579 has a later replacement boiler where the blower control valve will be on the other side. It also has washout covers that were not evident on the original boiler.

    Tom.
     
    Last edited: Dec 6, 2022
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  16. Mossy

    Mossy A classic grump Yorkshire man Full Member

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    Tom,

    I didn't spot the boiler stays on the photo of 1579, 2 per side would be easier than 3 but that's for tomorrow.
    Did the whole class have the blower valve on the righthand side or was it just the earliest batches.
     
  17. Tom Burnham

    Tom Burnham Full Member

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    As built, the blower valve was on the right hand-drivers side but, as it was the fireman's usual responsibility, on subsequent designs the blower valve control valve was on the left hand side. The Class A boiler was interchangeable with those used on several subsequent designs including Classes B and C and it looks like No. 1579 received a boiler from one of those. It's always best to rely on photo evidence for your chosen prototype and period of operation.

    Tom.
     
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  18. Mossy

    Mossy A classic grump Yorkshire man Full Member

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    Thanks Mate. I'm trying to create one of the first batch of 10 as built, which number is yet to be decided.
     
  19. Mossy

    Mossy A classic grump Yorkshire man Full Member

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    After some early morning shenanigans (who needs mind bending drugs when you can play with fusion 360), I finally manged to get boiler stays fitted to the model. These are temporary awaiting a nod of approval from the experts.

    Two per side as pointed out by Tom

    Screenshot 2022-12-07 065637.jpg

    And a close up of the front stay and updated filler cap

    Screenshot 2022-12-07 065605.jpg
     
    Last edited: Dec 7, 2022
  20. paul_l

    paul_l Staff Member Administrator

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    Looking good.

    A wee question about the handrail holes, from the images not sure wether you have made the holes parallel to the ground (horizontal) or radially to the boiler axis.
    If the former then the handrail knobs will not sit flush to the boiler.

    Paul
     
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