Date   

Re: The future of RP and small Resin Manufacturers?

Tim O'Connor
 

... if you mean eventually it will come to pass that we
everyday modeler types will be able to create masters...
NO. That is not what I mean Brian. This thread began by talking
about compensation for making masters, and it arose that there
are pattern makers out there who can do custom work. The problem
with this is that the TRANSLATION from a modeler's head to a
pattern maker's head to a resin caster's head is going to be a
risky, error prone path. But IF the modeler can specify what he
wants with drawings and specs, and if the pattern maker can do
a set of CAD drawings from that and the modeler can see they are
good, and then the pattern maker can turn on his SL equipment to
produce the masters Voila! Then the last step is the casting...

This type of thing can be done now, by custom pattern makers, but
without the CAD drawings as verification and without the inherent
reliability of the SL process, for Joe Modeler commissioning the
custom patterns is risky not only in terms of sales, but it also
is risky in terms of technical success. So this RP/SL process is
a way of assuring technical success. But like I said I don't think
it alters the cost structure significantly. I think your investment
in time & equipment is safe for now, and I hope you go ahead with
your venture.

Tim O'Connor


Re: ingoldsby cars

Roger Parry <uncleroger@...>
 

I am not familiar with this type of car, what was it and what did it
look like???

On Sep 17, 2005, at 9:19 PM, richtownsend@... wrote:

I am interested. My primary modeling interest is the Colorado &
Southern standard gauge, and they had these cars.

Richard Townsend
Lincoln City, Oregon


eabracher@... wrote:

I am working up some HOn3 Ingoldsby car kits.   there were a few
standard
gauge railroads that had them also.   is there any interest in a
standard gauge
car kit?

eric/riograndemodels


[Non-text portions of this message have been removed]


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Re: Sunshine mini-kits

Michael Aufderheide
 

Mont,

I've only got two, but I'm young yet. Do you deal in futures?

Mike

Montford Switzer <ZOE@...> wrote:
Mike:

I got in on the Monon mini-kits and they are great. I'm sure we can
work out a purchase arrangement. How many children do you have and when
was the first one born?

Mont Switzer

-----Original Message-----
From: STMFC@... [mailto:STMFC@...] On Behalf Of
Mike Aufderheide
Sent: Wednesday, September 14, 2005 6:31 PM
To: STMFC@...
Subject: Re: [STMFC] Re: Sunshine mini-kits

Tim,

I wrote the Lofton's about these and they don't have
any to sell by mail. But I'll ask at Naperville.
Anyone have a mini kit for the Monon they'd like to
sell?

Mike Aufderheide

--- timboconnor@... wrote:

I believe the ACF covered hopper mini-kits are still
available.
There were some on sale at Naperville last year.
Also still for
sale are AAR alternate-standard 2 bay offset
mini-kits for C&O,
NKP, NP and others, the AAR box car mini kits, and a
few others.



On Wednesday, September 14, 2005, at 03:36 PM,
Mike Aufderheide wrote:

Was this the mini-kit offered by Sunshine a
while ago?
Mike,
I'm guessing about 5 years ago, but it could have
been even longer.
Regards,
Ed Hawkins


[Non-text portions of this message have been
removed]





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Re: BLI vs. Walthers express reefers

Dan Stainton
 

Look your Broadway Cars over carefully, both of mine had broken
ladders and one had chipped/peeling paint on the
ladder

Dan
Stainton



--- In STMFC@..., blindog@m... wrote:
Now that Broadway has released their GACX 53'6" express reefer, why
should we care? Is it a different prototype than the Walthers model?
They look almost identical. The Broadway version costs a couple
dollars more.

Scott C


Re: Detail of AAR 1937 boxcar - Murphy and Hutchins Roofs

Anthony Thompson <thompson@...>
 

Steve Busch wrote:
I normally think of Murphy roofs as the type with raised rectangular panels,
as supplied with the Red Caboose / Intermountain / IMWX 1937 boxcars, for
example.
A dangerous generalization, Steve, as Standard Railway Equipment used the term "Murphy" for all its roofs with interlocking elements, starting well before solid-steel roofs were introduced. Within a particular era, it's not even safe, as SRE continued to sell different versions simultaneously. For confirmation, you can look at the Cycs for different periods.

Tony Thompson Editor, Signature Press, Berkeley, CA
2906 Forest Ave., Berkeley, CA 94705 www.signaturepress.com
(510) 540-6538; fax, (510) 540-1937; e-mail, thompson@...
Publishers of books on railroad history


Re: The future of RP and small Resin Manufacturers?

Brian Chapman <cornbeltroute@...>
 

Tim,

Is that supposed to make me feel better? lol.

Actually, going on instinct, I'm thinking RP will make a huge
difference, I just don't know how quickly and in what ways: Which
production methods existing today will it kill (if any)?

So often, "things" don't develop in ways that we predict. It'll be
interesting to see how this all shakes out, won't it?

rapid prototyping . . . makes "creating masters" more accessible to
those of us without all of the skills to do it. <

This kinda flies in the face of what Jim and/or Tom have said in this
thread, though, doesn't it? IIRC, they have pointed out that, as it is
now, a steep learning curve is involved along the entire route to
production with this process. Equally troublesome, the few companies
that possess this process at the moment likely will want little to do
with we small customer / manufacturer types with shallow pockets.

But, if you mean eventually it will come to pass that we everyday
modeler types will be able to create masters, certainly, you're right
on the mark. (Listen to me talk, as if I have a clue how this whole
thing will look in the future. Just talking in order to attempt to
understand it on some elementary level, I guess.)

casting is where the rubber meets the road! <
Unless and until the RP process is so powerful and efficient that we
can feed a prepared design into a machine and 20 seconds later it pops
out a complete replica (like ordering dinner aboard the Star Ship
Enterprise, push a button and your food appears, "magically").

Maybe RP will move from a "slow" process good enough only to produce
masters for casting to a point where it is the manufacturing process
itself, obsoleting resin casting alltogether.

Just one point of view, and no doubt it's way off course. <g

-Brian

Brian Chapman
Evansdale, Iowa


---


Re: ingoldsby cars

Richard Townsend
 

I am interested. My primary modeling interest is the Colorado & Southern standard gauge, and they had these cars.

Richard Townsend
Lincoln City, Oregon


eabracher@... wrote:

I am working up some HOn3 Ingoldsby car kits. � there were a few standard
gauge railroads that had them also. � is there any interest in a standard gauge
car kit?

eric/riograndemodels





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Detail of AAR 1937 boxcar - Murphy and Hutchins Roofs

S. Busch <SCSBusch@...>
 

Some further thoughts about the Murphy and Hutchins roofs on C&O cars -

Now I've had my work cut out for me!

I normally think of Murphy roofs as the type with raised rectangular panels, as supplied with the Red Caboose / Intermountain / IMWX 1937 boxcars, for example.

The Hutchins Dry Lading roofs were rather flat paneled, with a thin raised stiffening ridge running across the the center, parallel to the seams. Accurail supplies a real nice one with it's 40' outside braced single sheet box car. Ted Culotta used one of these on his Illinois Central auto car article in the Nov. 2004 RMC. Anyway, the C&O Diagram for the 4000-4500 series car says they had this roof. I don't know if I have a photo of one here though.

The 7000 - 7649 series car, according to it's diagram, is reported as having a Hutchins radial roof, except for 50 cars which were fitted with "S.R.E. Co." (Standard Railway Equipment) - Murphy - roofs. Looks to me that he Funaro & Camerlengo 1932 ARA C&O boxcar is a model of the Murphy roof car, even though the photo on the box shows a C&O Hutchins roof car. The radial version of this Hutchins design seems two have had two stiffening ridges per panel. Sunshine released a version of these cars some years back with the Hutchins roof. Also, the C&O bought 3 of the 5 prototype 1932 ARA cars after testing . These were built with Murphy roofs. C&O numbered the cars 1900 - 1902, and later renumbered them 2800 -2802. The C&O diagram for these cars reports them as having "S.R.E. Co." roofs.

Steve Busch
Duncan, Sc


Re: B&LE freight car roster

rockroll50401 <cepropst@...>
 

In 1941 the M&StL received 25 exB&LE box cars. The M&StL numbered them
50300-5348 even. Can you tell me what these cars looked like??
Thanks,
Clark Propst---


Re: NW & predecessor freight cars

Fred in Vt. <pennsy@...>
 

Steve,

The P&WV book I have drops this info into the N&W data base. Renumbering & relettering began in Oct. 1964. The best source for this would be a 1965 ORER, or the Society web-site at:
http://www.nwhs.org ; they have been very helpful in the past.

Fred Freitas

----- Original Message -----
From: stephenr37
To: STMFC@...
Sent: Saturday, September 17, 2005 3:51 PM
Subject: [STMFC] NW & predecessor freight cars


Would anyone happen to have information about the any of the following
freight car series? I'm primarily interested in any rebuildings,
renumberings, dispositions to NW or other roads, and confirming some
number series or builder information I'm lacking. If cars made it to
NW, I'm trying to determine NW class and NW number/renumber series.

ACY 400-419 Greenville 6/51 covered hoppers
ACY 570-584 Greenville 7/59 covered hoppers ex NAHX 31556-31610
ACY 850-963 Greenville 2/41 boxcars ex B&LE 91501-91800/81501-81800
ACY 6102-6133 Greenville 6/52 ore cars ex B&LE 20001-20500
ACY 7000-7199 ? /19 hoppers ex CRR?
(ACY)NAHX 31556-31580 Greenville 7/59 covered hoppers, leased to ACY
ITC 2600-2624 Greenville 3/53
NKP 4 Clark design air dump cars 7/26? (Greenville or Differential
built?)

NW 18 Clark design air dump cars ?/27? (Greenville or Differential
built?)

NW 25 Greenville 53.6" flatcars built about 1943 on O.O. 383
NW 52300-52349 Greenville 4/40? B4 class boxcars
NW 52400-52449 Greenville 10/40 B4 class boxcars
P&WV 1925-1949 Greenville 5/48? covered hoppers
P&WV 6700-6798 Greenville ?/60? hoppers
W&LE 78000-78999 Greenville 11-12/47 hoppers

Stephen Mayberry




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Re: The future of RP and small Resin Manufacturers?

Tim O'Connor
 

Brian,

I do not think rapid prototyping dramatically changes the
cost of resin kit production. Instead, I imagine it makes
"creating masters" more accessible to those of us without
all of the skills to do it. Or it makes it possible to
create more masters, faster, for people who really know
what they're doing. Technology often amounts to a trade
off of time for money. Besides, good masters is only half
the battle -- casting is where the rubber meets the road!

Tim O.


NW & predecessor freight cars

stephenr37 <gmayberry@...>
 

Would anyone happen to have information about the any of the following
freight car series? I'm primarily interested in any rebuildings,
renumberings, dispositions to NW or other roads, and confirming some
number series or builder information I'm lacking. If cars made it to
NW, I'm trying to determine NW class and NW number/renumber series.

ACY 400-419 Greenville 6/51 covered hoppers
ACY 570-584 Greenville 7/59 covered hoppers ex NAHX 31556-31610
ACY 850-963 Greenville 2/41 boxcars ex B&LE 91501-91800/81501-81800
ACY 6102-6133 Greenville 6/52 ore cars ex B&LE 20001-20500
ACY 7000-7199 ? /19 hoppers ex CRR?
(ACY)NAHX 31556-31580 Greenville 7/59 covered hoppers, leased to ACY
ITC 2600-2624 Greenville 3/53
NKP 4 Clark design air dump cars 7/26? (Greenville or Differential
built?)

NW 18 Clark design air dump cars ?/27? (Greenville or Differential
built?)

NW 25 Greenville 53.6" flatcars built about 1943 on O.O. 383
NW 52300-52349 Greenville 4/40? B4 class boxcars
NW 52400-52449 Greenville 10/40 B4 class boxcars
P&WV 1925-1949 Greenville 5/48? covered hoppers
P&WV 6700-6798 Greenville ?/60? hoppers
W&LE 78000-78999 Greenville 11-12/47 hoppers

Stephen Mayberry


Fruit Growers Express 52680-52799

lnbill <bwelch@...>
 

I am working on my Naperville presentation on the steel 40 foot cars
owned by FGE/WFE/BRE and there is one mystery I have yet to solve, the
series numbered 52680-52799, which is noted in the ORER as an all steel
car.

This series, which first appeared in 1942 with 100 cars, is an unknown
entity to me in terms of the design and what the cars looked like, as I
have never seen a photo of any car from this series.

I am curious if anyone has a photo from this series and what their
source was, and any other descriptive info thay can give me?

Bill Welch


Photos Uploaded 17 SE 05

george30045
 

Photos of a pipe load on a flat car for your inspection and comments.
Comments, critiques, suggestions, and Ideas are solicited.
I am not exactly sure where the photos went, since after uploading
them, I can't access the photo section to hunt for them. I dunno what
happened yet.

Demetre>


Re: Sunshine mini-kits

Montford Switzer <ZOE@...>
 

Mike:

I got in on the Monon mini-kits and they are great. I'm sure we can
work out a purchase arrangement. How many children do you have and when
was the first one born?

Mont Switzer

-----Original Message-----
From: STMFC@... [mailto:STMFC@...] On Behalf Of
Mike Aufderheide
Sent: Wednesday, September 14, 2005 6:31 PM
To: STMFC@...
Subject: Re: [STMFC] Re: Sunshine mini-kits

Tim,

I wrote the Lofton's about these and they don't have
any to sell by mail. But I'll ask at Naperville.
Anyone have a mini kit for the Monon they'd like to
sell?

Mike Aufderheide

--- timboconnor@... wrote:

I believe the ACF covered hopper mini-kits are still
available.
There were some on sale at Naperville last year.
Also still for
sale are AAR alternate-standard 2 bay offset
mini-kits for C&O,
NKP, NP and others, the AAR box car mini kits, and a
few others.



On Wednesday, September 14, 2005, at 03:36 PM,
Mike Aufderheide wrote:

Was this the mini-kit offered by Sunshine a
while ago?
Mike,
I'm guessing about 5 years ago, but it could have
been even longer.
Regards,
Ed Hawkins


[Non-text portions of this message have been
removed]





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ingoldsby cars

eabracher@...
 

I am working up some HOn3 Ingoldsby car kits. there were a few standard
gauge railroads that had them also. is there any interest in a standard gauge
car kit?

eric/riograndemodels


B&LE freight car roster

stephenr37 <gmayberry@...>
 

I apologize in advance for a long posting, but I've been working on a
B&LE freight car roster and would like to solicit additions and
corrections. I'm interested in number series, builder, build month
and year/s, builder lot number, B&LE class number, B&LE renumberings,
dispositions, and clarifications on secondhand cars B&LE acquired.
There also may be series that I've missed. Though the roster runs
past 1960, it's the pre-1960 cars that I have the hardest time
finding information on.

1000 ? /61 covered hopper
1001 ? /? covered hopper
1001-1099 ? /? gondola
1000+1795 GSC lot 1162 1/79 hopper ex ROCK 700300-700799 via URDX
1900-1904 Morrison International 12/60 caboose
1905-1921 International Car 10/75 caboose
1954+1969 GSC lot 306 4/41 offset bay window caboose
2000 GSC lot 915 1/67 hopper
2001 B&LE /67 hopper
2004 Pullman lot 9399 3/69 hopper HK41 class
2005-2974 ? /? gondola
3501-4500 (1st) PSC /03 gondola ex URR
3601-3650 (2nd) ACF lot 1997 4/40 covered hopper LO1 class
3701-3720 (2nd) Pullman lot 8231B 5/55 covered hopper LO2 class
3721-3740 (2nd) Pullman lot 8308B 5/56 covered hopper LO3 class
3741-3765 (2nd) Pullman lot 9188 3-5/67 covered hopper LO4 class?
3766-3820 (2nd) Pullman lot 9462A 10/69 covered hopper LO5 class
4000-4039 GSC lot 801 1/63 flatcar ex D&TSL 6100-6199
4301-4400 (2nd) ACF /39 flatcar FM5 class
4401-4450 (2nd) Magor lot P-9780 4/41 flatcar FM6 class
4550-4582 ? /? flatcar
4599 GSC /57? or 4/62? flatcar ex 4603
4601 Thrall 4/58 flatcar FM9 class
4602 Thrall 4/58 depressed center flatcat FD1 class
4603 GSC /57? or 4/62? flatcar to 4599
4604-4605 Thrall 6/68 flatcar
4606-4610 ? /? flatcar
4700-4734 ? /? flatcar
5101-5400 (1st) SSC /08 hopper ex H.C. Frick Coke
5301+5400 (2nd) ? /39? TOFC flatcar FC5 class
5401+5450 ? /41? TOFC flatcar FC6 class
6001-6010 (1st) ? /57? flatcar FMS7 class
6000-6014 (2nd) Evans lot 1-6009 9/67 coil FMS10 to 16000-16014
8000 GSC lot 686 5/57 flatcar
8101-9100 PSC /02 hopper
9101-9600 SSC /07 hopper
9601-9900 SSC /08 hopper ex National Mining
9901-10000 SSC /08 gondola ex National Mining
12101-13100 SSC 7/05 gondola
13101-13600 PSC /07 gondola
13601-14100 SSC 10/12 gondola
14101-15100 (1st) PSC /14 gondola
14101+14130 (2nd) ? /? gondola
14201-14210 (2nd) ? /? gondola
14251+14299 (2nd) ? /? gondola
14301+14350 (2nd) ? /? gondola
14400-14404 (2nd) ? /? gondola
14425+14429 (2nd) ? /? gondola
14500 ? /46? hopper HM27 class
15001+15500 (2nd) ? /40? gondola GBR7 class
15000-15099 (3rd) GSC lot 962 12/68 gondola
15100-15179 ?/? gondola
15200-15479 Pullman lot 9821 9/75 gondola GB31 class
16001-16500 (1st) PSC /40 gondola
16000-16014 (2nd) Evans lot 1-6009 9/67 coil GBSR 27 ex 6000-6014
16050-16063 (2nd) Evans lot 1-6002 5-6/67 coil GBS36 ex P&LE 42100-
42249

16100-16109 (2nd) Evans lot 201022 2-4/66 GBS37 coil ex P&LE 42000-
42099 via EJ&E 7300-7359/16100-16109

17001+17500 ? /40? gondola GB2 class
18001-18025 GSC lot 616? /53 gondola GBR3 class ex URR 1000+2974?
18026-18040 ? /? gondola
18051-18063 GSC /54 gondola ex URR
18070-18080 ? /? gondola
19001+19999 ? /37- /42? gondola GB8 class
20001-20500 GSC lot 603 6/52 ore HMA1 class, some to ACY 6102-6133
20501-20700 GSC lot 622 10/53 ore HMA2 class
20701-20890 ? /? ore
20900-20982 ? /? ore
21000-21020 ? /? ore
30000-30199 ACF lot 11-09601 8/80 gondola
31000-31009 Evans lot 1-6010 12/67-1/68 GBSR15 coil car
32000-32009 Darby 12/67 gondola
32010-32030 ? /? gondola
33026-33100 ? /? gondola
34001-34025 GSC lot 157 12/29 gondola GB4 class
34800-34999 ? /? gondola
35001-35500 (1st) RSC /16 gondola
35026-35100 (2nd) Pullman lot 8136 9-10/53 gondola GBS65? class
36001-36500 GSC lot 245 /37 gondola GB5 class
36501-36800 GSC lot 344 6/42 gondola GB6 class
36801-37000 PSC /42 gondola GB6 class
39001+39500 ? /37? gondola GBS5 class
40001-41000 (1st) SSC 10/14 hopper
40000-40049 (2nd) ? /? ballast hopper
41001-41250 PSC /14 hopper
41251-41500 RSC /14 hopper
41501-42000 ACF /16 hopper
42001-42750 PSC /17 hopper
42751-43500 SSC 10/16-?/17 hopper
43501-43750 ACF 10/18 hopper
43751-44000 SSC 10/18 hopper
45000 ? /60? boxcar
45001-45100 PSC 3/35 hopper HT13 class?
50001-50500 (1st) Pullman lot 5842 10/46 hopper HM25 class
50501-50750 (1st) PSC 12/46 hopper HM25 class
50000+50299 (2nd) GSC lot 1151 /78 hopper ex ROCK 700000-700299
50300+50799 (2nd) GSC lot 1162 1/79 hopper ex ROCK 700300-700799
50800+51019 GSC lot 1174 4-5/79 hopper ex ROCK 700800-701299
51020+51299 GSC lot 1174 4-5/79 hopper ex ROCK 700800-701299
60001-60300 SSC 6/31 hopper HT4 class
60301-60600 PSC /31 hopper HT4 class
60601-60950 ACF /31 hopper HT4 class
60951-61050 GSC lot 177 7/31 hopper HT4 class
62001-62500 Pullman lot 8022 3/52 hopper HT26 class
63000-63499 ? /? hopper
63500-63599 ? /? hopper
64000-64499 ? /? hopper
65001-65800 Pullman lot 5521 6/36 hopper HT17 class
65000-65547 Pullman lot 9904 11-12/75 hopper HT48 class - 65000 built
painted bicentennial #1776?

65548 Pullman lot 9904B 2/76 hopper ex 99025?
65549 Pullman lot 9904A 2/76 hopper HT51 class
65550-66149 GSC lot 1148 11/77 hopper HT52 class
65801-66000 PSC /36 hopper HT17 class
66001-67000 Pullman lot 5555 4-6/37 hopper HT19 class
67001-68000 Pullman lot 5622 2-4/40 hopper HT24 class
68001-68650 Pullman lot 5660 3-4/41 hopper HT22 class
68651-69075 Pullman lot 5712 5-7/42 hopper HT23 class
69101-69900 Pullman lot 5725 5-9/43 hopper HT24 class
70001-70200 PSC /26 hopper ex American Steel & Wire
70201-70841 RSC /29 hopper ex H.C. Frick Coke
74000-74499 ? /? hopper
75001-75750 ACF /36 hopper HT16 class
75751-76000 GATC /36 hopper HT16 class
76001-76500 ACF lot 1633 6/37 hopper HT18 class
77000-77600 ? /? hopper
77800-78500 ? /? hopper
80001-80385 SSC 3/13 boxcar
80386-80400 SSC 3/13 boxcar
80401-80691 SSC /12 boxcar ex URR
80692-81075 PSC /12 boxcar ex URR
81001-81500 GSC lot 291 2-3/40 boxcar XM3 class ex 91001-91500
81501-81800 GSC lot 311 2/41 boxcar XM3 class ex 91501-91800
82001 GSC lot 745 3/62 boxcar ex GSC GV-5
82100-82103 ACF lot 11-06374 1/66 boxcar XML7 class
82500-82529 EJ&E? /66? boxcar ex EJ&E
82550-82569 ? /? boxcar
84000-84499 ? /? hopper
87000-87477 ? /? hopper
90001-90100 (1st) SSC 4/13 boxcar
90001-90100 (2nd) Pullman lot 5584 8/38 boxcar
90101-90200 Pullman lot 5584 8/38 boxcar
90201-90300 ACF /41 boxcar XM3 class
90000+90638 ? /? hopper
91001-91500 GSC lot 291 2-3/40 boxcar XM1 class to 81001-81500
91501-91800 GSC lot 311 2/41 boxcar XM4 class to 81501-81800
92000-94700 ? /? hopper
95000-96999 ? /? hopper
98000-98199 Pullman lot 9481 5/70 hopper
98202-99001 Pullman lot 9556 9-12/71 hopper HK43 class to CR
498209+498267

99002-99005 Pullman lot 9556A /71 hopper
99006-99024 Pullman lot 9556B /71 hopper
99025 Pullman lot 9904B 2/76 hopper to 65548?

In addition, there are some I can't identify a number series for:

15 Ortner coil gondolas 3/69
5 Darby coil gondolas 4/70
16 Darby coil gondolas /72- /73?
50 Greenville 30' hot ingot cars /72?


Stephen Mayberry


Stereolith / Rapid Prototyping (trying again)

Rob Kirkham <rdkirkham@...>
 

This is very intriguing. So if one was to turn a form for a tank car body on a lathe, with appropriate ends, and a recess along the main diameter to allow for a wrapper, one could rapid prototype wrappers with appropriate rivet strips, then have them flat cast, and glue them round the form to make a variety of tank cars with that diameter? For radial course tanks, one wrapper could potentially be made to fit a number of diameters (rivet spacing perhaps being the differentiating characteristic that could spoil the idea.) For insulated cars, an inner diameter rivet strip for the ends would have to be added as well.

The all one would need is a variety of frames to put beneath those tanks,

frames and domes....

Rob Kirkham -
getting closer to homemade tank cars.

----- Original Message -----
From: "pullmanboss" <tgmadden@...>
To: <STMFC@...>
Sent: Friday, September 16, 2005 5:39 PM
Subject: [STMFC] Re: Stereolith / Rapid Prototyping (trying again)


Jeff Aley asked:
Is it easier to create a CAD drawing for RP as compared to doing
drawings for injection-molding? I am under the impression that I
could easily do a CAD drawing for a box car, whereas DESIGNING
injection molds requires far more intelligence, skill, and
experience than just re-drawing a paper drawing on the computer.
I would think that the RP method frees one from having to consider
things like material flow, how to eject the part from the mold,
etc. I do, of course, realize that resin casting can only handle
undercuts to a very limited extent.

Are my fantasies even *close* to reality, or am I way off base?
Gee Jeff, I'm not sure I want any insight into your personal fantasies!

CAD for RP is neither easier nor harder than CAD for injection
molding, just different. For starters, your parts can have recesses on
the bottom side, but not details. Remember that honeycomb support
structure I mentioned? All features on the first layer have to bridge
multiple cells of that honeycomb or they will simply float away and
sink to the bottom of the tank. You want to avoid overhangs for the
same reason - everything on a part has to be supported by something as
it is built. Don't put fine details on vertical surfaces - rivets
built sideways don't look very good. Avoid sloped or curved surfaces
if possible. They show stairstepping, which on a 1:1 conventional RP
part is removed by sanding. You can't do that on a miniature part with
rivets. So, the idea is to break down your model into a series of flat
RP parts, then build those flat parts (or first-generation castings of
them) into the actual casting masters. Stereolithography doesn't do
very thin parts well, so if you want thin flat parts, design them on a
thicker support plate and flat cast them later. See the following
photo for an example:
http://home.att.net/~pullmanproject/Details.jpg

The parts are left & right "wings" for the top of a Pullman blind end
(sloped surfaces on the finished end) and left & right collision posts
for the same end (vertical surfaces on the finished end). I made a
rubber mold from that plate and two others, which I then cut apart so
that the surfaces of the plates became the surfaces of three new,
small molds for flat casting. Easier to show than to describe, but I
just did the first pour on those molds and they're in the pressure
tank curing right now.

My Naperville clinic on this topic will have some "Gee Whiz!" stuff
just for show, but mostly I'll be going over design considerations
like the above.

Tom Madden






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Re: Stereolith / Rapid Prototyping (clarification)

pullmanboss <tgmadden@...>
 

I wrote:
....For starters, your parts can have recesses on
the bottom side, but not details. Remember that honeycomb support
structure I mentioned? All features on the first layer have to
bridge multiple cells of that honeycomb or they will simply float
away and sink to the bottom of the tank.
The bottom of the part doesn't have to be in one plane - the honeycomb
support structure will build up to meet the contour whatever the
shape. You just can't have small projections on the bottom side. There
won't be anything to support them.

Tom Madden


Re: Railroad Press Magazine

Schuyler Larrabee
 

Google it, Ed. I've seen it. It's published in your area, western NYS. It's a pretty nice
magazine, with what seems to me to be pretty high quality printing, and some interesting articles.
Prototype oriented, not models, AFAIK. It deserves more . . .uh . . . .press.

SGL

-----Original Message-----
From: STMFC@... [mailto:STMFC@...] On
Behalf Of ed_mines
Sent: Friday, September 16, 2005 12:17 PM
To: STMFC@...
Subject: [STMFC] Railroad Press Magazine

Anyone familiar with "Railroad Prsss magazine"?

Ed





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