Nathan 4000C's in 1.5" Scale

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Kimball McGinley
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Re: Nathan 4000C's in 1.5" Scale

Post by Kimball McGinley » Thu Feb 25, 2021 9:11 am

Anthony: Sorry, if I caused any confusion. when you wrote " ...shrinkage due to the temperature of the aluminum when shooting..." I ASSumed the aluminum was molten. I now understand that you were referring to the temperature of the aluminum mold when the wax is shot.

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Greg_Lewis
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Re: Nathan 4000C's in 1.5" Scale

Post by Greg_Lewis » Thu Feb 25, 2021 11:25 am

Sandiapaul wrote:
Thu Feb 25, 2021 6:08 am
"Hopefully no one plays around with it... but now you've given me something to be concerned about!"

Reminds me of a story...a good friends dad was a machine designer/engineer/machinist, the best blend of how things used to be back when. There was a machine he had designed(at TRW) that kept coming back all out of whack. He noticed that the operators were fiddling around with it and that was the problem. So as a test he took off one part, took it it the shop and machined a small ring and a groove into a solid part so it looked just like a slotted head screw. Again the machine came back needing adjustments. Sure enough he found marks where someone had tried to "adjust" this "screw"!

Since we're telling stories, some years ago I visited the Moa telescope in New Zealand. This is a large research instrument and the mirror has weights around the perimeter which are set to correct for sag in the glass (think wavelengths of light). There is a tag on each adjustment that reads, "Never touch this." When I asked about the unusual wording, they said that "Do not touch" didn't work but this wording did.
Greg Lewis, Prop.
Eyeball Engineering — Home of the dull toolbit.
Our motto: "That looks about right."
Celebrating 30 years of turning perfectly good metal into bits of useless scrap.

AnthonyDuarte
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Re: Nathan 4000C's in 1.5" Scale

Post by AnthonyDuarte » Sat Feb 27, 2021 10:40 pm

Picked up a body casting for the 4000C. This was a test to see if the gating worked out, and it seems to have worked pretty well. The wax for this had some issues, but I still wanted to try it out. I’ll machine it up and use it to dial in the water and steam valves so they’re positioned perfectly with respect to the starting lever.

Here it is next to the 1.6” 1918A body casting. Quite a difference in size!
858AAAED-5FE0-40DB-B721-952EEB3924A4.jpeg

765nkp
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Re: Nathan 4000C's in 1.5" Scale

Post by 765nkp » Sat Feb 27, 2021 11:12 pm

Very impressive! The control quadrant puts it over the top. Nice work

datman
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Re: Nathan 4000C's in 1.5" Scale

Post by datman » Sun Feb 28, 2021 3:56 am

Nice jewellery!!

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Re: Nathan 4000C's in 1.5" Scale

Post by AnthonyDuarte » Mon Mar 01, 2021 8:55 pm

It occurred to me that, since these injectors will be bolted onto the cradle casting like the prototype, they will benefit from the cast elbow that was required for the tight clearances. Luckily I have the drawing for said elbow. The 3.5" pipe union, which the drawing specifies should be "extra strong," will be cast in so all you have to do is solder in your 3/8" tubing. Everything you'll need to install the injector with or without the elbow will be included. The instruction manual keeps getting longer and longer!
Nathan 4000C 1.5'' Assembly.JPG

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Re: Nathan 4000C's in 1.5" Scale

Post by AnthonyDuarte » Fri Mar 05, 2021 2:47 pm

The nozzles are complete. The 4000C body is so darned tall that I needed to add a spacer to the delivery cone. This pushes the delivery cone an extra .516” into the body. The only alternative would be to make it all one piece, but that would make machining the taper unnecessarily challenging.

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NP317
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Re: Nathan 4000C's in 1.5" Scale

Post by NP317 » Sat Mar 06, 2021 1:21 am

Wow!
I would love to see a video of your machining processes. CNC I presume.
RussN

AnthonyDuarte
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Re: Nathan 4000C's in 1.5" Scale

Post by AnthonyDuarte » Mon Apr 05, 2021 11:07 am

Had the pleasure of seeing the progress on Jim’s Berkshire at Jack Bodenmann’s shop. What a work of art... the more you look at it the more you see, which is one of my favorite aspects of super detailed models.

Part of the reason for the visit was to bolt up the 4000C body to Jim’s cradle to see how it fit, and man it fit like a glove!
It’s a good thing I switched to 1.5” scale because it would not have cleared the back of the cradle otherwise, and the mounting bosses on the injector lined up perfectly with the existing holes. With the cradle holes spot faced, we did have to add a #5 washer but that’s all that was needed.

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You can see why the cast delivery elbow was a necessary addition!

I also brought a completed quadrant so we could see how it layed out in the cab.

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All the waxes are at the foundry now except for the main body castings. They’re such a headache to shoot that I haven’t had time to sit down and get them all done.

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VO4454
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Re: Nathan 4000C's in 1.5" Scale

Post by VO4454 » Mon Apr 05, 2021 9:45 pm

Hello Anthony, Absolutely incredible work. On the cool factor scale of 1 thru 10, this about a 100.
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apm
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Re: Nathan 4000C's in 1.5" Scale

Post by apm » Sun Apr 11, 2021 12:45 pm

What's that huge hole thru the middle of the valve there for and what does it do? I assume it is prototypical but it looks to be right in the middle of the flow path.

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Re: Nathan 4000C's in 1.5" Scale

Post by AnthonyDuarte » Sun Apr 11, 2021 2:10 pm

apm wrote:
Sun Apr 11, 2021 12:45 pm
What's that huge hole thru the middle of the valve there for and what does it do? I assume it is prototypical but it looks to be right in the middle of the flow path.
It’s the connection point for the overflow. The “flow path” at that point is entirely inside the nozzles.

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