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Author Topic: Feasibility of 3D printing Erie Stillwell coaches  (Read 26036 times)

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Chris333

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #60 on: February 08, 2016, 10:19:09 PM »
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Hubba hubba. At the start I didn't even care. Now I might have to care!
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Chris333

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #61 on: February 09, 2016, 07:19:53 AM »
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And I was just reading about these being used in special trains from Youngstown to Cleveland for the Indians games. 3-4 coaches with a PA1 would do it.
http://www.rr-fallenflags.org/el/loco/erie0851lba.jpg
« Last Edit: February 09, 2016, 08:32:09 AM by Chris333 »
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Sokramiketes

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #62 on: February 09, 2016, 08:27:14 AM »
+1
Quote from: Scott Lupia on February 07, 2016, 01:50:54 PM

The etchings are underway.

Scott Lupia

Scott- 

PPD LTD actually has the ability to send the brass through the etcher twice.  You can get three levels of detail (plus cut through) without having to stack layers of brass!

Works great for heavyweight car sides, and instances where rivets would otherwise be inset as holes on a standard etch.

Here's the last project I worked on:

[ Guests cannot view attachments ]

Just send them another layer on the drawing and ask for the first .005" (or whatever thickness) to be eaten away to form the first level of detail.
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Lemosteam

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #63 on: February 11, 2016, 10:20:46 PM »
+2


The 3D model with @Scott Lupia 's imported etching designs in the side!
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Chris333

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #64 on: February 11, 2016, 10:34:40 PM »
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So is it all one piece or is each color a separate part?
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jmlaboda

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #65 on: February 12, 2016, 03:12:37 AM »
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Quote
So is it all one piece or is each color a separate part?

See the drawing on page one of this thread.
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Lemosteam

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #66 on: February 12, 2016, 04:42:22 AM »
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Quote from: Chris333 on February 11, 2016, 10:34:40 PM
So is it all one piece or is each color a separate part?

'Twill be a craftsman kit. RP core, steps, trucks, interior, roof and vents, with inlaid side, passenger cabin door, vestibule floor etchings.

What do you guys think of the roof contour so far?
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Chris333

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #67 on: February 12, 2016, 05:23:48 AM »
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« Last Edit: February 12, 2016, 05:28:59 AM by Chris333 »
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Lemosteam

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #68 on: February 12, 2016, 07:33:26 AM »
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@Chris333 , yes, all parts are separate, sorry if my last post was unclear.  Also I forgot to mention the underframe and details will be a single separate part.

Personally I think too much detail on some designs prevents folks from being able to achieve the surface finish they desire before paint, such as the roof.  On this design, one should be able to sand that thing till perfect if there are any imperfections in the contour from the printing process.  Just MHO.
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Iain

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #69 on: February 12, 2016, 02:01:21 PM »
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Keep in mind that the 3D printed core will shrink, also, Shapeways does not allow you to speficy orientation, so the shrinkage factor will likely be different every time.  This is the downside to using a 3D printed core with an etched wrapper.
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thomasjmdavis

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #70 on: February 12, 2016, 05:41:42 PM »
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I was wondering about shrinkage- I have no real knowledge of the physical properties of the various shapeways materials, but I have read several complaints or observations on the phenomena.  Question for those more knowledgeable than I am...

How much shrinkage is there in percentage terms?

Does priming and painting seal the surface enough to ******** shrinkage?  Or does this have no impact on the chemical process?

Might it be better to make a master via rapid prototype and then cast resin copies?  I have several resin cars and have not noted shrinkage with resin, although I have noticed some that become brittle if not finished.
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Chris333

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #71 on: February 12, 2016, 06:51:47 PM »
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I bet Bryan Bussey has got all of this figured out.
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Lemosteam

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #72 on: February 12, 2016, 07:12:57 PM »
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This page lists all of the properties of FUD and FXD:

https://www.shapeways.com/materials/frosted-detail-plastic

The page states a variation of +0.1 to -0.2 over each 100mm.  That's a very small shrinkage rate.  Tolerance can always be overcome with good design.

I think Scott and Bryan have been through this before.
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Scott Lupia

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #73 on: February 12, 2016, 07:25:32 PM »
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As far as shrinkage of RP'd parts goes, I worked with Bryan Bussey with his KV caboose. The shrinkage didn't seem to be much of a problem so I am not concerned enough to not consider trying this out.

Scott Lupia
« Last Edit: February 12, 2016, 08:29:51 PM by Scott Lupia »
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Scott Lupia

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Re: Feasibility of 3D printing Erie Stillwell coaches
« Reply #74 on: February 12, 2016, 07:40:29 PM »
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Also, John and I are trying to keep the cost of the final product down. I have yet to find the guy who makes resin castings for free. Last time I outsourced a 2-part mold it cost 100 bucks for the mold and a buck per part. Figure 15 castings per mold before the mold takes a crap. That's $115 for 15 cars. That's $7.66'ish per car extra based on prices I got 3 years ago from a friend. I am sure that number is higher today. Just rambling here...

Scott Lupia
« Last Edit: February 12, 2016, 08:32:20 PM by Scott Lupia »
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