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brass model foam decomposition
Staffan Ehnbom <staffan.ehnbom@...>
I couldn't find anything in archives on brass model foam decomposition. What can be done to the attack on the paint on the model? Staffan Ehnbom
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Re: filling screw holes - An alternative body filler putty
mark
Group, I agree with the fact that even with a pin vise should have been a no-brainer.However I was in a situation where I could not do it myself,and trusted a friend to do it for me.He did some other work for me at the same time and it all came out exactly as intended,except for these holes.I once years ago was told Bondo was great for something like this.I have only been working with resin kits for about two years.Most of what I have built in the last 40 years was mainly wood and styrene,so I welcome All suggestions I don't want to have to buy a big container of something that will take a life time to use.Out of all the
resin kits I have built this is the only time I have ever had an issue.Lesson learned do it yourself and IF you need some some help,have a fellow modeler help you. Thanks for the all the in-put and advice Mark McCoy tavwot@...
From: "paul.doggett2472@..." To: STMFC@... Sent: Monday, September 9, 2013 1:04 PM Subject: [STMFC] RE: filling screw holes - An alternative body filler putty Mark I agree with all Bruce says, drilling plastic or resin is easy with a pin vice (vise) Paul Doggett England --- In STMFC@..., wrote:
Mark,
What material is the car made of? If it is resin, it might be best to fill it with more resin, but be aware that it may not really adhere well You may need to core out a larger hole, add styrene to that and then drill and tap that . If it is plastic,
fill it with styrene and glue, let it dry and drill and tap.
Why are you worrying about a drill press? I drill all mine by hand and it is not a big deal at all.
Regards
Bruce
Bruce F. Smith
Auburn, AL
"Some days you are the bug, some days you are the windshield."
On Sep 9, 2013, at 10:09 AM, <tavwot@...>
<tavwot@...> wrote:
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Re: filling screw holes - An alternative body filler putty
Actually I used a "Holland" motor like A-Line sells
toggle quoted messageShow quoted text
<http://www.ppw-aline.com/re-power.htm>, with flywheel on one end and Gyro collet on the other. Hooked up to a variable DC transformer and run at about 4.5 volts, it goes thru styrene and resin like crazy, and is quick enough you don't have time to bend the drill and break it off. I used to break 2-3 drills per resin car before, now I can make it 2-3 cars without breakage. The only problem I have is if the drill binds up, you have to carefully turn the motor in the opposite direction manually to back it out. Thanks! -- Brian Ehni From: <paul.doggett2472@yahoo.co.uk> Reply-To: STMFC List <STMFC@yahoogroups.com> Date: Monday, September 9, 2013 12:04 PM To: STMFC List <STMFC@yahoogroups.com> Subject: [STMFC] RE: filling screw holes - An alternative body filler putty Mark I agree with all Bruce says, drilling plastic or resin is easy with a pin vice (vise) Paul Doggett England
--- In STMFC@yahoogroups.com, <stmfc@yahoogroups.com> wrote:
Mark, What material is the car made of? If it is resin, it might be best to fill it with more resin, but be aware that it may not really adhere well You may need to core out a larger hole, add styrene to that and then drill and tap that . If it is plastic, fill it with styrene and glue, let it dry and drill and tap. Why are you worrying about a drill press? I drill all mine by hand and it is not a big deal at all. Regards Bruce Bruce F. Smith Auburn, AL https://www5.vetmed.auburn.edu/~smithbf/ "Some days you are the bug, some days you are the windshield." On Sep 9, 2013, at 10:09 AM, <tavwot@...> <tavwot@...> wrote:
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Re: filling screw holes - An alternative body filler putty
paul.doggett2472@...
Mark
I agree with all Bruce says, drilling plastic or resin is easy with a pin vice (vise)
Paul Doggett England
--- In STMFC@..., <stmfc@...> wrote:
Mark,
What material is the car made of? If it is resin, it might be best to fill it with more resin, but be aware that it may not really adhere well You may need to core out a larger hole, add styrene to that and then drill and tap that . If it is plastic,
fill it with styrene and glue, let it dry and drill and tap.
Why are you worrying about a drill press? I drill all mine by hand and it is not a big deal at all.
Regards Bruce
Bruce F. Smith Auburn, AL https://www5.vetmed.auburn.edu/~smithbf/
"Some days you are the bug, some days you are the windshield."
On Sep 9, 2013, at 10:09 AM, <tavwot@...>
<tavwot@...> wrote:
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Re: An alternative body filler putty
Bill Welch
I have had to redo the truck holes I have drilled on a couple of Southern Car & Foundry tank car underframes and used the Devcon 2-Ton epoxy. Worked very well.
Bill Welch
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Re: An alternative body filler putty
Andy Carlson
To the old standby of plugging drilled holes with styrene rod followed by an application of modelers putty can be added another technique: Due to the non-shrinking properties of epoxy, I use it instead of styrene for plugging holes. If the surrounding surface of the hole is smooth, try applying some Scotch Tape stretched over the hole. Back fill the hole with epoxy until the voids under the tape are filled, this is why the use of transparent tape is necessary. Give the epoxy an overnight cure before peeling off the tape. The resulting fix needs very little attention before painting, usually rubbing off the remains of the adhesive is enough. If the holes are too small, you can ream the backside of the hole with an Exacto # 11 blade. This technique is also great for filling in unwanted caboose windows. You would be surprised how much labor is saved, and ghosting of the opening through the paint is reduced many times to the point of non-detection. The trait of epoxy to mimic the shine of the tape is a big asset in this process. If the surrounding area of the hole has detail, fill the hole from the backside as before but without the tape. After the epoxy surfaces, wait until the epoxy is "green" and adz the excess epoxy with a #11 blade with sideways motion of the knife blade. I have an old toolmakers polishing stone ground to a small chisel point which can finish the surface to a near paint-ready condition. Epoxy isn't the best tool on the workbench, but at times it sure seems so. Beware, though, most epoxies are not suited for this work. Avoid ALL quick setting epoxies, including the worst--5-minute. I recommend the following: 1) Devcon 2-ton White 2) Ace White 2-ton 3) Ace marine tube epoxy (This was not in my local ce last time I looked) 4) JB-Weld slow cureing I am looking for suitable epoxies, as favorites disappear from the market. -Andy Carlson Ojai CA
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filling screw holes - An alternative body filler putty
Mark,
What material is the car made of? If it is resin, it might be best to fill it with more resin, but be aware that it may not really adhere well You may need to core out a larger hole, add styrene to that and then drill and tap that . If it is plastic,
fill it with styrene and glue, let it dry and drill and tap.
Why are you worrying about a drill press? I drill all mine by hand and it is not a big deal at all.
Regards Bruce
Bruce F. Smith Auburn, AL https://www5.vetmed.auburn.edu/~smithbf/
"Some days you are the bug, some days you are the windshield."
On Sep 9, 2013, at 10:09 AM, <tavwot@...>
<tavwot@...> wrote:
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Re: An alternative body filler putty
Mark, if it is a plastic car, ream out the hole with a drill bit sized to match some styrene rod. Then plug the hole with the rod. You can then drill the correct hole without the chance of your drill bit wandering by hitting dissimilar materials.
Doug Harding www.iowacentralrr.org
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Re: An alternative body filler putty
Steve SANDIFER
One approach is to drill the area out with a 1/8" drill, insert a piece of 1/8" evergreen tubing, and then use a 2-56 to hold the truck and screw it into the hole in the tubing. Another approach is to fill the current hole with CA or epoxy and the redrill it. A drill priess, even a little Dremel drill press, is very valuable I getting holes straight.
________________________________________________________________ Steve Sandifer 12027 Mulholland Drive, Meadows Place, TX 77477 713-376-0684 www.ssandifer.com From: STMFC@yahoogroups.com [mailto:STMFC@yahoogroups.com] On Behalf Of tavwot@yahoo.com Sent: Monday, September 09, 2013 10:09 AM To: STMFC@yahoogroups.com Subject: [STMFC] RE: An alternative body filler putty Hello Group , I have been following this topic since the start.I have a question concerning filling holes that were drilled and tapped.I have a flat car that I had a friend drill and tap for me.(he was the only person I know that had a drill press).Some how he managed to drill and tap both holes at an angle.I need to fill the holes so that I can re-drill and tap the holes,and I am looking for any ideas and/or guidance on this matter. Thank you in advance for any help on this, Mark McCoy tavwot@yahoo.com --- In stmfc@yahoogroups.com, <smokeandsteam@...> wrote: I found this out by accident when trying to strip paint from an assembled whitemetal kit. A strong solution of caustic soda unglues many epoxies quite well. On the other hand I wouldn't recommend drinking it unless the martinis have completely lost their thrill... Aidrian On 9/09/2013, at 1:50 PM, Schuyler Larrabee wrote: hs later, I was able to remove the lead sticks fairly easily. I left the sticks in the alcohol and eventually was able to wipe them off with no alcohol left on them. So, while it takes a fairly long time, and probably only applies to metal to metal joints, one CAN get epoxy to give up its grip. [Non-text portions of this message have been removed]
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Re: An alternative body filler putty
mark
Hello Group , I have been following this topic since the start.I have a question concerning filling holes that were drilled and tapped.I have a flat car that I had a friend drill and tap for me.(he was the only person I know that had a drill press).Some how he managed to drill and tap both holes at an angle.I need to fill the holes so that I can re-drill and tap the holes,and I am looking for any ideas and/or guidance on this matter. Thank you in advance for any help on this, Mark McCoy tavwot@...
--- In stmfc@..., <smokeandsteam@...> wrote: I found this out by accident when trying to strip paint from an assembled whitemetal kit. A strong solution of caustic soda unglues many epoxies quite well.
On the other hand I wouldn't recommend drinking it unless the martinis have completely lost their thrill... Aidrian On 9/09/2013, at 1:50 PM, Schuyler Larrabee wrote:
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Re: Bowser PRR H30
Eric Mumper
Rich,
toggle quoted messageShow quoted text
Thank you very much for the reply and the link. Just to be a bit of a pain on this, what would be a safe bet for the as delivered trucks on the early (1935 built) H30? If I remember correctly the ASF A-3 had not been developed by 1935. Here are some guesses as to prototype vs. model truck from your list: 2E-F2A - Bowser Crown 2E-F10 - Tahoe 108? 2E-F11,F14 - P2K National B-1 2E-F12,F15 - Tahoe 107? or P2K AAR Eric Mumper
--- In STMFC@yahoogroups.com, SUVCWORR@... wrote:
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Re: open grid roof walks
Pierre <pierre.oliver@...>
Patience Young Skywalker!
toggle quoted messageShow quoted text
Let us get the test runs sorted out. All in good time. Pierre Oliver
--- In STMFC@yahoogroups.com, Richard Brennan <brennan8@...> wrote:
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Re: An alternative body filler putty
Aidrian Bridgeman-Sutton <smokeandsteam@...>
I found this out by accident when trying to strip paint from an assembled whitemetal kit. A strong solution of caustic soda unglues many epoxies quite well.
toggle quoted messageShow quoted text
On the other hand I wouldn't recommend drinking it unless the martinis have completely lost their thrill... Aidrian
On 9/09/2013, at 1:50 PM, Schuyler Larrabee wrote:
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Re: Tichy open grid roof walks
Greg Martin
tony@... writes:
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Re: An alternative body filler putty
Schuyler Larrabee
Denny, who we have not heard enough from lately, said:
[Epoxies} all can serve as a fillers, inasmuch as they do not shrink, are sandable, and when cured are all but impervious to all solvents.
Well, not to ALL solvents. But you have to be patient, very patient. If you look at the cans on epoxy paints or on furniture that has polyurethane finishes, there will be a warning about putting alcohol on the finish. Now, clearly your martini isn’t going to lift the finish, but prolonged exposure* will cause issues. Some time ago, I had epoxied some lead sticks I had cast inside . . . something brass, and I can’t recall what it was . . . and regretted it. Since I wasn’t in a hurry to finish this particular project, I put it in a jar filled with 90% alcohol, and set it aside. Several months later, I was able to remove the lead sticks fairly easily. I left the sticks in the alcohol and eventually was able to wipe them off with no alcohol left on them. So, while it takes a fairly long time, and probably only applies to metal to metal joints, one CAN get epoxy to give up its grip.
[Who is aware that polyurethanes and epoxies are not the same thing, BTW]
*that’s prolonged exposure of the martini to the finish. Prolonged exposure of yourself to martinis may cause issues too, but those are outside the scope of this list, I believe. Maybe not. Mike? Ruling please?
From: STMFC@... [mailto:STMFC@...] On Behalf Of Anspach Denny
Sent: Friday, September 06, 2013 11:26 PM To: STMFC@... Subject: [STMFC] Re: An alternative body filler putty
2-Ton Epoxy is a good conventional, if pricey product (because of its small packaging). Other packaged similar slow-setting epoxies should serve just as well. They all can serve as a fillers, inasmuch as they do not shrink, are sandable, and when cured are all but impervious to all solvents. A distinct disadvantage as a filler is that when cured, they are usually much harder than the substrate, i.e. styrene, resin, or wood, so that for the unwary modeler who sands away, the result is commonly smooth founded mounds of epoxy filler rising proud above surrounding fields of destroyed surface detailing and sanding-induced shallow excavations.
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Re: open grid roof walks
Richard Brennan <brennan8@...>
At 04:23 PM 9/8/2013, Tony Thompson wrote:
<snip> the Apex grid bars are 1 inch high. The Plano etched board is 0.0085" which in HO is 3/4-inch. The Kadee, to cite one of the best plastic ones out there, is 0.0205" or more than 1-3/4 inch.So: Next generation for modelers is laser-cut 0.012 stainless??? Where do we send our orders? (or WHEN???) -------------------- Richard Brennan - San Leandro CA --------------------
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Re: Tichy open grid roof walks
OTOH, replacement OPEN GRID walkways for the Atlas, Red Caboose, and Intermountain tank cars -- that would be sweet. After 1950 I think they stopped being built with solid walkways. As Pierre said you could do these with bendable etchings, for appearance (tank cars walkways are much thicker than box car running boards) and also for strength and stiffness. Plano made parts for tank car but they were not bendable and are much too thin for tank cars. Tim O'
At 9/8/2013 07:23 PM Sunday, you wrote:
Pierre Oliver wrote:
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Re: Tichy open grid roof walks
Tony Thompson
Pierre Oliver wrote:
Nope. As Tim O'C corre4ctly stated, the Apex grid bars are 1 inch high. The Plano etched board is 0.0085" which in HO is 3/4-inch. The Kadee, to cite one of the best plastic ones out there, is 0.0205" or more than 1-3/4 inch. As Tim says, it is close to DOUBLE the prototype size. I agree, and the "too thin" product is CLOSEST to correct thickness. I fail to understand why this set of measurements has to be repeated every year or so, Apparently it is embedded in the consciousness of some modelers that etched metal is "too thin for correct size" -- and then they recommend Kadee, or worse, other brands. Time to face the physical facts, gentlemen or ladies. 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, tony@... Publishers of books on railroad history
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Re: Tichy open grid roof walks
Pierre <pierre.oliver@...>
So part of the issue with etched running boards is a limitation of the process.
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Current etched running boards are indeed too thin, compared to the prototype. When designing an etched running board, the grid cannot be thinner than the thickness of the sheet material. So if you desire the lacy look of an Apex design you have to sacrifice thickness. Some people have tried to deal with this by designing a running board that is 2 pieces and you fold over onto itself. The new S scale CNR 8 hatch reefers use this approach. Experiments are underway right now to try a slightly different approach to the design process and get correct thickness running boards. Stay tuned. Typical white or yellow brass is far too soft for this application. Stainless steel or nickel silver has been used for it's resistance to kinking and Phosphor bronze is also a good choice. Having said all that, for a metal running board I prefer a too thin item over a too thick item. Just my opinion. Pierre Oliver
--- In STMFC@yahoogroups.com, tgregmrtn@... wrote:
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New Haven paint and stenciling applied in May 1955
Bill Welch
In the Walter Frost Collection at the Vancouver Library there are three 1937 type New Haven boxcar photos apparently painted in May 1955. Two of the photos are slightly different views of NH 36141 in what appears to be a boxcar red color with a large "NH" to the left of the door while dimensional and weight data, reporting marks, and car number are all to the right of the door. The "N" in the "NH" is barely visible due to the film I am sure. NH 36415 appears to be a black car and the "NH" is all stenciled in white.
Can someone please educate me as to the use of the parallel schemes? I assume there was some sort of marketing or publicity campaign involved. Did IMWX ever do either scheme or has Red Caboose or InterMountain ever offered them? Thank you!
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