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 Structures on th LP&N RR, vol.4
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Author Previous Topic: On building MoW cars Topic Next Topic: My HO scale Nativity scene.
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Guff
Fireman

Premium Member


Posted - 06/24/2018 :  12:24:58 PM  Show Profile  Reply with Quote
Thanks Bob,
Big building but it will be impressive in large scale.
Some day I need to try casting parts.
What material/manufacturers do you use for molds and resin?
Dave



Country: USA | Posts: 1526 Go to Top of Page

sgtbob
Fireman

Premium Member


Posted - 06/24/2018 :  1:04:09 PM  Show Profile  Visit sgtbob's Homepage  Reply with Quote
Thanks Dave,

I have tried most of the brands available and to tell the truth it's hard to tell the difference
most of the time. For the reasons that they work every time, are easy to use, and I can go on
line and reorder some and have it in about two days, I have settled on the rubber and resin
sold by Model Expo. With some you have to weigh and measure each part, with these it's 1/2 and
1/2, the same amount of each part. This one is not touchy, you don't have to be "right on",
just close. They have several types but the cheapest works very good. I have used the set
with a longer working time but for the small one piece molds I am talking about here this works for me.

Bob


http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=30102&whichpage=1
http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=38921
http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=45371
http://www.freewebs.com/santmod/

Edited by - sgtbob on 06/24/2018 1:53:26 PM

Country: USA | Posts: 3551 Go to Top of Page

Guff
Fireman

Premium Member


Posted - 06/24/2018 :  1:30:39 PM  Show Profile  Reply with Quote
Thanks Bob!
Dave



Country: USA | Posts: 1526 Go to Top of Page

Pennman
Fireman

Premium Member


Posted - 06/25/2018 :  09:16:03 AM  Show Profile  Reply with Quote
Bob,
Just catching up with your build, looking great! I don't know how you guys build so quickly and so carefully executed. I now realize that in this scale, if you drop a part, it is easy to find, unlike HO scale...
Rich




Country: USA | Posts: 3590 Go to Top of Page

sgtbob
Fireman

Premium Member


Posted - 06/27/2018 :  07:21:20 AM  Show Profile  Visit sgtbob's Homepage  Reply with Quote
Got a little more work done on this build. When I look at a photo I tend to break it
down in my mind into smaller projects. In this case the bay windows. Looking at the
lower floor section I see that in three pieces too, a bottom section, the window
section, and the top section. Moving back to see the whole bay it looks like the top half
is an exact copy of the lower half. When you add the other bay you have four identical
bays. Since there is some detail work to be done here I will need four of each section
and while the window section is pretty plain and an easy styrene build, the top and bottom
sections are a candidate for casting.

this photo show my masters, the molds, and the first castings for each section.



Better shots of the masters and the castings. I appologize for my poor photographing skills.






Bob



http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=30102&whichpage=1
http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=38921
http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=45371
http://www.freewebs.com/santmod/

Country: USA | Posts: 3551 Go to Top of Page

sgtbob
Fireman

Premium Member


Posted - 06/27/2018 :  07:46:20 AM  Show Profile  Visit sgtbob's Homepage  Reply with Quote
These are laying loosely to show where they will fit. I take back my previous statement,
the upper and lower bays are not identical, the upper bays are about a scale foot
shorter, which was normal construction back then, the lower floor often had a higher
ceiling. Makes no difference in my model as the difference is taken up in the window
section, the other sections are identical.



There is also a lesson here for those who are just beginning to cast parts. You will notice
that the two corbels on either end of the top casting are missing from the master and the
casting. That is because of the way they are angled. If I made the mold with all the
corbels attached the master would be locked into the mold, I added those last four
corbels later.

Bob


http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=30102&whichpage=1
http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=38921
http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=45371
http://www.freewebs.com/santmod/

Country: USA | Posts: 3551 Go to Top of Page

Carl B
Fireman

Premium Member

Posted - 06/27/2018 :  08:30:43 AM  Show Profile  Visit Carl B's Homepage  Reply with Quote
Incredible work Bob!

Your casting skills are amazing!



Country: USA | Posts: 2971 Go to Top of Page

Guff
Fireman

Premium Member


Posted - 06/27/2018 :  09:21:32 AM  Show Profile  Reply with Quote
Bob,
Incredible indeed! Nice job!
Is the window trim on the right a master or a cast piece?
Dave



Country: USA | Posts: 1526 Go to Top of Page

Ensign
Fireman

Posted - 06/27/2018 :  09:25:01 AM  Show Profile  Reply with Quote
Bob, just getting caught up here, with what you are doing.
Nothing really surprizing, same excellent work as usual.
Those bay castings are incredible!

Greg Shinnie



Country: Canada | Posts: 7777 Go to Top of Page

sgtbob
Fireman

Premium Member


Posted - 06/27/2018 :  09:40:22 AM  Show Profile  Visit sgtbob's Homepage  Reply with Quote
Carl, Dave, and Greg, Thanks for your comments.

Dave, that's a casting.

Bob


http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=30102&whichpage=1
http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=38921
http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=45371
http://www.freewebs.com/santmod/

Country: USA | Posts: 3551 Go to Top of Page

Orionvp17
Fireman

Premium Member

Posted - 06/27/2018 :  10:54:24 AM  Show Profile  Reply with Quote
Nicely done, Bob, and a good reminder about NOT locking the part in the mold....

Pete
in Michigan



Country: USA | Posts: 6158 Go to Top of Page

Terrell
Fireman

Posted - 06/27/2018 :  10:57:01 AM  Show Profile  Reply with Quote
You are the master of masters, Bob !!


Country: | Posts: 1677 Go to Top of Page

Michael Hohn
Fireman



Posted - 06/27/2018 :  2:00:21 PM  Show Profile  Visit Michael Hohn's Homepage  Reply with Quote
Bob,

Masterful work, naturally.

Iíve done some resin casting from masters Iíve made. The problem I have is with the shelf life of the chemicals. Have you found any that last longer than others? Also, do you do anything to extend shelf life?

Mike


_______________________________________________________________________________________________
Nobody living can ever stop me, as I go walking that freedom highway -- Woody Guthrie

Country: USA | Posts: 4133 Go to Top of Page

quartergauger48
Fireman

Premium Member


Posted - 06/27/2018 :  2:01:31 PM  Show Profile  Reply with Quote
Outstanding castings Bob, and a nice explanation as well. I have done some casting, but have not even come close to mastering it as of yet. What outlet are you purchasing your mold materials at?


Country: USA | Posts: 5669 Go to Top of Page

sgtbob
Fireman

Premium Member


Posted - 06/27/2018 :  2:22:21 PM  Show Profile  Visit sgtbob's Homepage  Reply with Quote
Pete, Terrell. Mike, and Ted, thanks for your comments.

Mike, I have not had problems, the stuff I'm using right now has to be at least 6 months old, maybe more.

Ted, I order on-line from Model-Expo. I use the CR-300 resin and the 1-to-1/Rapid rubber.

Bob


http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=30102&whichpage=1
http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=38921
http://www.railroad-line.com/forum/topic.asp?TOPIC_ID=45371
http://www.freewebs.com/santmod/

Country: USA | Posts: 3551 Go to Top of Page
Page: of 47 Previous Topic: On building MoW cars Topic Next Topic: My HO scale Nativity scene.  
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