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Re: 3D printing (Was: New early P&R steel.....)
radiodial868
Ryan, thanks for this very good explanation. I reread it 3 times. I've been monitoring 3D printing with interest for about 3 years now, looking to move past having shapeways print my small detail parts and hoping commercial technology will eventually be able to do more complex car bodies. In the meantime, I keep watching for a home printer that can do those small detail parts. Speed is not important, but finish and ease of maintenance is.
RJ Dial Burlingame, CA
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Re: Bridge girder on three PRR FM flat cars
mopacfirst
And that small angle retaining piece is significantly bent, as are the tie rods attached to it, making it appear that the girder probably had a significant shift forward, assuming that the leading edge of the load was toward the viewer.
Ron Merrick
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Re: Bridge girder on three PRR FM flat cars
And in this photo, the retaining piece on the bottom at the end is fully attached to the girder, supporting the contention that the Steamtown photo is a "damage" photo.
Regards,
Bruce Smith
Auburn, AL
From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> on behalf of BRIAN PAUL EHNI <bpehni@...>
Sent: Saturday, December 21, 2019 10:31 PM To: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> Subject: Re: [RealSTMFC] Bridge girder on three PRR FM flat cars We’ve discussed this load before. Here’s another picture.
Thanks!
From: <main@RealSTMFC.groups.io> on behalf of mel perry <clipper841@...>
if you look closely at the pic, the front centering bracket is partially separated from the bottom of the girder, indicating that the load had shifted forward slightly probably becauae of lack thereof or insufficient restraints, wonder if cfr49 was in existence back then or would have been the aar? mel perry
On Sat, Dec 21, 2019, 3:23 PM Matthew Metoyer <mmetoyer@...> wrote:
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Re: Photo: ACL 17859
Eric's post points out that produce that would have been loaded into freight in the steam era may at times have little resemblance to what you might see in the market today. Agriculture and the genetics of the food raised have changed radically. New varieties
of crops are continually created by cross breeding and selection to meet threats such as disease, and market pressures, such as no bruises or blemishes.
Regards,
Bruce Smith
Auburn, Al
From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> on behalf of Eric Hansmann <eric@...>
Sent: Sunday, December 22, 2019 8:24 AM To: main@realstmfc.groups.io <main@realstmfc.groups.io> Subject: Re: [RealSTMFC] Photo: ACL 17859 Those could be of the Moon and Stars variety, or Sugar Baby. There have been many varietals. Here are some.
Eric Hansmann
Murfreesboro, TN
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Re: Grace Tank Car
John Hile
Hello All,
AESX 576 is a Pressed Steel Car Co. product. Speedwitch Media's "Steam Era Freight Cars Reference Manual, Volume Two" has several photos for reference. The underframe of GRYX 168 may represent the fact that ACF changed running board supports on "Type 27" underframes around 1940. On "Type 27" prior to that date, they tend to be the tapered c-channels, hung on the side of the center sill (as shown on GRYX 168). These are similar (if not identical to) "Type 21" supports. After approx. 1940, the supports tend to be the angle-sections, which are triangulated to the top and bottom of the center sill. I have a great degree of confidence in the 1940 date from the photo evidence, but am using the word "tend" because we all know there is probably an ACF "Type 27" lot out there somewhere that will contradict the assumption that all supports changed in 1940. I'm glad to see this coming-up on the list, as a few of us briefly discussed this at the last St. Louis RPM. Also, note the mis-matched trucks on GRYX 168. John Hile Blacksburg, VA
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Re: Photo: ACL 17859
Eric Hansmann
Those could be of the Moon and Stars variety, or Sugar Baby. There have been many varietals. Here are some.
toggle quoted messageShow quoted text
Eric Hansmann Murfreesboro, TN
On Dec 22, 2019, at 7:59 AM, Douglas Harding <doug.harding@...> wrote:
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Re: Photo: ACL 17859
Donald B. Valentine <riverman_vt@...>
Perhaps, Mel, but I wonder if they are just quite a bit larger than we are used to. Cordially, Don Valentine
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Re: Photo: ACL 17859
They look like pumpkins to me.
Doug Harding www.iowacentralrr.org
From: main@RealSTMFC.groups.io [mailto:main@RealSTMFC.groups.io] On Behalf Of mel perry
those are wierd looking wstermelons mel perry
On Sat, Dec 21, 2019, 7:13 PM Bob Chaparro via Groups.Io <chiefbobbb=verizon.net@groups.io> wrote:
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Re: Bridge girder on three PRR FM flat cars
RICH CHAPIN
photo date 1927
49 CFR regulates hazardous materials not structural loads, although there were AAR rules that were the predecessors of hazmat since 1911 I suspect AAR had practices for over-sized loads back then here's that girder in place rich chapin
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Santa Fe FE 26 DD 40-ft
Greg Martin
Hey Gize. Does anyone have access to plans for this car? I am looking for the dimensions of the side sill. I believe the it should br 26 inches and I eould like to verify that. It it customary gor the time, but I would love to know for sure before I brand this resin mastet. TIA, Gteg Martin Sent from my Verizon, Samsung Galaxy smartphone -- Hey Boss, Somehow I got deleted from this group in late May. I guess someone didn't like me. Jail is a lonely place. Greg Martin
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Re: Bridge girder on three PRR FM flat cars
BRIAN PAUL EHNI
We’ve discussed this load before. Here’s another picture.
Thanks!
From: <main@RealSTMFC.groups.io> on behalf of mel perry <clipper841@...>
if you look closely at the pic, the front centering bracket is partially separated from the bottom of the girder, indicating that the load had shifted forward slightly probably becauae of lack thereof or insufficient restraints, wonder if cfr49 was in existence back then or would have been the aar? mel perry
On Sat, Dec 21, 2019, 3:23 PM Matthew Metoyer <mmetoyer@...> wrote:
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Re: Photo: ACL 17859
mel perry
those are wierd looking wstermelons mel perry
On Sat, Dec 21, 2019, 7:13 PM Bob Chaparro via Groups.Io <chiefbobbb=verizon.net@groups.io> wrote:
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Photo: ACL 17859
Photo: ACL 17859 A photo from the Collier Museums: Not a great photo but at least a partial view of this ACL ventilated boxcar. Bob Chaparro Hemet, CA
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Re: 3D printing (Was: New early P&R steel.....)
Dennis good point you brought up about the grit blasting. I do grit blast all my 3D printed parts or sand flat areas of parts with the sanders I sell trough National Scale Car. I developed the sanders specifically for this purpose.
Even surfaces that don’t have wax still have lines on them. These lines are left by the roller and knife of the jet printing head. The roller and knife need to be serviced at least a couple times a year to keep them in top condition. This is done by a 3D Systems technician that we have to pay and come in to do it. It’s not cheap, they charge upwards of $2000 a day for servicing the machine plus parts. Another source of part quality is shrinkage. This can be controlled with axis print compensation. Basically an offset put into the printer setup to correct for part shrinkage in x , y and z. But if parts are printed on different printers the compensation might be a bit off between them and parts could come out different lengths. This may have been the case with the girders in one of the previous posts. Also the longer the part the more possibility of length discrepancy do to shrinkage. Ryan Mendell
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Re: 3D printing (Was: New early P&R steel.....)
Dennis Storzek
On Fri, Dec 20, 2019 at 06:57 AM, Corey Bonsall wrote:
That being said, if I make sure to use a proper primer and gloss paint base coat, most of those lines go away.Thanks for the further informed discussion on the 3D printers. I have a further thought for Corey, or anyone else dealing with an SLA model: It's clear that if a prime coat will hide the diagonal layer lines, they can't be very latge steps, and only show because they are an aberration on what is a smooth surface. I wonder if grit blasting with 220 grit abrasive would remove them, or more correctly break up the surface enough that the eye can't pick them out. I know that many of the resin kit builders grit blast resin kits to improve paint adhesion with no ill effect to the surface detail. Dennis Storzek
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Re: Bridge girder on three PRR FM flat cars
Dennis Storzek
On Sat, Dec 21, 2019 at 11:15 AM, Bruce Smith wrote:
While hump yards were at least 25 years old at the time, they were not common.The real question is, when was the first retarder yard built. Until that time hump yards were "rider" yards, and there would be someone there to protest, "I'm not riding THAT thing down." I wouldn't either, with only one operable hand brake for all that weight. Dennis Storzek
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Re: Bridge girder on three PRR FM flat cars
Richard Townsend
I suspect the solid door is temporarily attached to the ventilator door by a hasp and lock or seal for security. The connection would have to be broken in order to open the doors. If they slid as one they would always cover the opening with one door or the other.
toggle quoted messageShow quoted text
On Dec 21, 2019, at 3:59 PM, Bud Brock via Groups.Io <BudPCCRR@...> wrote:
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Re: Bridge girder on three PRR FM flat cars
Bud Brock
Also note the watermelon car. The 2 doors are strapped together to move as one.
Bud Brock
PC&C RR
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Re: Bridge girder on three PRR FM flat cars
mel perry
if you look closely at the pic, the front centering bracket is partially separated from the bottom of the girder, indicating that the load had shifted forward slightly probably becauae of lack thereof or insufficient restraints, wonder if cfr49 was in existence back then or would have been the aar? mel perry
On Sat, Dec 21, 2019, 3:23 PM Matthew Metoyer <mmetoyer@...> wrote:
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Re: Bridge girder on three PRR FM flat cars
Guy Wilber
mel perry wrote:
“that also my thought, there is no forward or backwards restrains at all, i guess back then "g's" hadn't been invented, lol” The load matches The ARA’s Open Top diagram (for the period) for girders. The manufactured bolsters are bolted to the flat car deck through its ends and on each side of the center sill. The girder is secured on each end with the rods passing through the attached bolster and into the bracket bolted to the bottom flange. Guy Wilber Reno, Nevada
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