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rrjohn46
New Hire
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Posted - 07/20/2017 : 4:51:02 PM
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Bob, Yeah, FUD is pretty brittle. I've broken a few FUD items. Even when you wick some ACC into it FUD isn't very strong.
I like that you haven't incorporated the dome bases into the boiler. Having the dome bases part of the domes rather than the boiler means no tricky masking where the bases and boiler meet.
John Bopp
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Country: USA
| Posts: 8 |
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railman28
Fireman
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Posted - 07/22/2017 : 1:01:40 PM
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Thank you John, Yes I think it'd much easier to fit the bases of the domes to the boiler using the traditional methods and then attach after painting than to try and mask them in place.
Shapeways says my brass frame and third boiler won't ship until the 28th so while I not-so-patiently wait I'm working on drawing the details like cover plates and side rods and answering such questions as How am I going to mount the walkways? Do I want a peak or curved cab (prototypes had both)? Should the cab be FUD or Brass? And so on and so on. This is all much more work than I had imagined bu that is Okay as I am enjoying it greatly.
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It's only make-believe
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Country: USA
| Posts: 5010 |
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railman28
Fireman
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 Posted - 07/26/2017 : 4:12:58 PM
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Just a quick update, The brass frame was done a week earlier than Shapewapes has estimated and is in the mail now. Here are the details that I have been drawing while waiting for the frame and boiler prints;
Put together, for printing there are two cover (front and back)plates, two side rods, two main rods and a two piece drive shaft holder/weight. These are all the parts I need for the mechanism. I hope they're all the right size.
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It's only make-believe
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Country: USA
| Posts: 5010 |
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deemery
Fireman
Premium Member
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Posted - 07/26/2017 : 4:48:22 PM
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Are you designing/3D printing the cylinders, or using an existing part?
I'm really looking forward to seeing the brass boiler.
dave
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| Modeling 1890s (because the voices in my head told me to) |
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Country: USA
| Posts: 7508 |
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railman28
Fireman
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Posted - 07/26/2017 : 4:55:12 PM
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Dave, I'm using Precision Scales' Wabash Cylinders. This Boiler is the Third prototype and is in FUD. Only the frame is brass.
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It's only make-believe
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Country: USA
| Posts: 5010 |
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deemery
Fireman
Premium Member
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Posted - 07/27/2017 : 08:58:06 AM
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Ah... Did you cost out the boiler in brass? Would the extra weight be worth it?
dave
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| Modeling 1890s (because the voices in my head told me to) |
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Country: USA
| Posts: 7508 |
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railman28
Fireman
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Posted - 07/27/2017 : 10:38:11 AM
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I did, about $120, and yes worth it because the better/longer it operates the more satisfaction the project will give. The more weight, the more work it can do, the more satisfaction. Even the weight being centered lower gives better tracking and stability. Not to mention the brass can take an accident or two and the paint will adhere better. IMHO
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It's only make-believe
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Country: USA
| Posts: 5010 |
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masonamerican
Fireman
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Posted - 07/28/2017 : 2:38:08 PM
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I'm also waiting impatiently! Must say the rods look terrific. Really shows how great new medium 3D printing can be.
Håkan
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Country: Sweden
| Posts: 1716 |
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railman28
Fireman
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Posted - 07/28/2017 : 6:28:20 PM
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I find it so hard to wait. But, I've been waiting for decades for a model of this engine (it's a long ugly story) so what's a few days?
Thank you, Hagan, I going to loose a little of the details you see in the drawing when they are printed (the bolt head top on the oil cups) but I don't think it will be noticed on the model. Shapeways tells me these parts shipped today.
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It's only make-believe
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Country: USA
| Posts: 5010 |
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railman28
Fireman
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Posted - 07/29/2017 : 7:48:20 PM
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The wait be over. May I present the final frame in brass.
From the bottom, This is a sorry photo.
and here one with the third prototype boiler being test fitted.
The frame weights about 1.5 ounces. The brass casting came out exactly as predicted by the test prints I did. A very little filing and the drives will drop right into the slots.
I'll take more photos later but I'm just going to enjoy viewing the frame for a while.
I'm very please with the results at this point.
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It's only make-believe
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Country: USA
| Posts: 5010 |
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deemery
Fireman
Premium Member
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Posted - 07/29/2017 : 8:48:32 PM
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VERY NICE!
dave
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| Modeling 1890s (because the voices in my head told me to) |
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Country: USA
| Posts: 7508 |
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Michael Hohn
Fireman
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Posted - 07/29/2017 : 10:03:37 PM
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Beautiful, Bob.
--Mike
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_______________________________________________________________________________________________
Nobody living can ever stop me, as I go walking that freedom highway -- Woody Guthrie |
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Country: USA
| Posts: 4820 |
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railman28
Fireman
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Posted - 07/30/2017 : 7:43:23 PM
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Dave, Mike, Thank you very much.
Here's some more shots. In this first picture you can see how the drivers almost drop into the slots. Just a little careful filing.
In this view you can see how thin the space is between the back two drivers. I will try to open it up a bit when I open the driver slots.
Here's one with the brass frame and its prototypes;
And the last FUD prototype with the brass print (same Drawing);
Shapeways deserves a bit of credit here. The difference between the casting and the original use to be about 4%. You can see how little it is now.
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It's only make-believe
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Edited by - railman28 on 07/30/2017 7:46:17 PM |
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Country: USA
| Posts: 5010 |
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Carrie Creek
Fireman
Premium Member
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Posted - 07/30/2017 : 8:56:07 PM
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Nice work, Bob, looks great! I guess when you want a certain prototype engine this is what you need to do but seems like a lot of work. We'll see how I feel when I get started on my 2-6-6 Mason-Bogie scratch build using a Tyco Big 6 frame as a starting point.
Again well done!!
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Phil Z
POR (press on regardless) |
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Country: USA
| Posts: 1502 |
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railman28
Fireman
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Posted - 07/31/2017 : 02:33:31 AM
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Thanks Phil. IMHO The Tyco big 6 is a good solid core and a good start point.
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It's only make-believe
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Country: USA
| Posts: 5010 |
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