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Author Previous Topic: 3D Printing (Rapid Prototyping) Topic Next Topic: Narrowgauge 0-scale ore car
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Ensign
Fireman

Posted - 11/14/2016 :  10:47:57 AM  Show Profile  Reply with Quote
Bob, nice bit of work there, carving out that balsa foam.
I really must try using this balsa foam sometime.

Greg Shinnie



Country: Canada | Posts: 6965 Go to Top of Page

sgtbob
Fireman

Premium Member


Posted - 11/14/2016 :  1:53:09 PM  Show Profile  Visit sgtbob's Homepage  Reply with Quote
Mike, Bruce, and Greg, thanks for commenting.

Bruce, I'm not a very good photographer so this may not show very well, but here does.....

I sometimes take a piece of broken rock and tap it into the surface of the foam to roughen it up but if the stone are small this is not usually noticed in the finished wall.

This may not be the best way to do this but it works for me. Here are some tools to choose from
but you could also use a nail, and old ball point pen, almost anything, the foam is very
soft. That bottom one is a very old leather working tool that is my favorite.



I first just go along marking out the line between the stones, not going too deeply, all
very freehand. At that point it really just looks like a simple drawing.



For me, this next step makes the difference and it is not hard to do. I just go over the same
lines quickly, not too carefully. That process removes a little more foam and rounds off the
stones to make them more noticeable than the mortar lines. It makes them look more like
individual stones. You will find yourself doing this a couple of times to get the look you want.



After that I brush on two heavy coats of gesso which hardens the surface and provides an
excellent surface for painting.

I hope this helps.

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 11/14/2016 1:56:53 PM

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hon3_rr
Fireman

Premium Member


Posted - 11/14/2016 :  2:30:20 PM  Show Profile  Reply with Quote
Wonderful work with the balsa foam, along with a good tutorial on carving. Funny you noted that it's not quite like 'carving' plaster, but it's not really impressing to obtain the mortar lines. I too was really challenged in how to describe the experience. I just know it's a lot easier than plaster.

Anyway, nice work and I'm looking forward to seeing how your coloring/painting comes out.


-- KP --
Life is to short to build all of the models I want to.

Country: USA | Posts: 7006 Go to Top of Page

Ray Dunakin
Fireman



Posted - 11/14/2016 :  9:13:40 PM  Show Profile  Visit Ray Dunakin's Homepage  Reply with Quote
Looking good!


Country: USA | Posts: 3028 Go to Top of Page

Bill Gill
Fireman



Posted - 11/15/2016 :  07:47:59 AM  Show Profile  Reply with Quote
Bob, I like how you shaped the stones for the foundation. By going over the mortar lines 'quickly, not too carefully' you keep the stones from fitting too neatly together like jigsaw puzzle pieces. How much does the gesso toughen the soft balsa foam?


Country: USA | Posts: 1631 Go to Top of Page

Dutchman
Administrator

Premium Member


Posted - 11/15/2016 :  08:33:33 AM  Show Profile  Reply with Quote
Bob, many thanks for the photos of your 'tools' and the description of the process. That was very helpful.


Bruce

Modeling the railroads of the Jersey Highlands in HO and the logging railroads of Pennsylvania in HOn3

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sgtbob
Fireman

Premium Member


Posted - 11/15/2016 :  09:48:27 AM  Show Profile  Visit sgtbob's Homepage  Reply with Quote
Thanks Kris, Ray, Bill, and Bruce, for you comments.

Bill - It puts a nice crust on it. You can still poke holes in it but it will not longer be damaged
by finger pressure or mild bumps. Don't know exactly how to describe it but there should be no
problems under normal use.

Long ago there used to be a water thin clear two part epoxy that was used to soak into the
surface to make it rock hard but I think that's overkill.

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: 3009 Go to Top of Page

hon3_rr
Fireman

Premium Member


Posted - 11/15/2016 :  1:39:33 PM  Show Profile  Reply with Quote
Bill,
I have displayed and passed around my assembled New York mill and practice walls in five club meetings/clinics, including a NMRA Regional convention. The practice walls and assembled mill have been passed through a lot (approximately 200+) of folks. The assembled balsa foam mill structure has been 'drop' tested at least three times from a height of about five feet (chest high) onto a uncarpeted floor.

I'm happy to report that even with all of the handling and abuse, I have not been able to identify any damage or paint failures. The technique of applying acrylic Gesso as a primer appears to add enough strength to the foam structure and carved detail surfaces that the foam is significantly strong to be used as a modeling medium. The Gesso primer also performs well as I have not seen/identified any paint flaking or discoloration.

Hopefully this will provide you with a comfort zone about the durability of the Balsa Foam and Gesso combination.


-- KP --
Life is to short to build all of the models I want to.

Edited by - hon3_rr on 11/15/2016 1:56:55 PM

Country: USA | Posts: 7006 Go to Top of Page

Bill Gill
Fireman



Posted - 11/15/2016 :  3:41:14 PM  Show Profile  Reply with Quote
Thanks, Bob & hon3_rr. That sounds workable for a klutz like me :)


Country: USA | Posts: 1631 Go to Top of Page

sgtbob
Fireman

Premium Member


Posted - 11/17/2016 :  07:00:32 AM  Show Profile  Visit sgtbob's Homepage  Reply with Quote
Here's that stone part with two coats of gesso. That smaller piece is part of the support system for the water wheel.



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: 3009 Go to Top of Page

Guff
Crew Chief

Premium Member


Posted - 11/17/2016 :  09:53:36 AM  Show Profile  Reply with Quote
Good looking stonework!
Dave



Country: USA | Posts: 867 Go to Top of Page

Ensign
Fireman

Posted - 11/17/2016 :  10:18:45 AM  Show Profile  Reply with Quote
Bob, I agree with Dave, that is good looking stonework on your foundation.

Greg Shinnie



Country: Canada | Posts: 6965 Go to Top of Page

Orionvp17
Fireman

Premium Member

Posted - 11/17/2016 :  11:00:50 AM  Show Profile  Reply with Quote
Bob,

This Rocks!

Thanks for the SBS on the balsa foam.

Pete
in Michigan



Country: USA | Posts: 5355 Go to Top of Page

Ray Dunakin
Fireman



Posted - 11/17/2016 :  11:14:52 PM  Show Profile  Visit Ray Dunakin's Homepage  Reply with Quote
Very nice!


Country: USA | Posts: 3028 Go to Top of Page

Carl B
Fireman

Premium Member

Posted - 11/18/2016 :  07:46:24 AM  Show Profile  Visit Carl B's Homepage  Reply with Quote
Thanks for the SBS Bob!




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