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Casting a Resin stockcar
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 Posted: Thu May 26th, 2011 05:45 pm
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dave1905
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True that you have to keep the pressure on for the whole cure time, but the cure time for resin is only a couple minutes and much of that is consumed in the pouring the resin and loading it in the pressure chamber.  So really the resin casting only spends about 3-5 minutes in the pressure chamber.

When it comes out I then put the mold in a warming chamber.  It is two tin foil lasagna pans.  I have a clamp on light fixture that shines a flood light through a hole in the top pan on one end.  That's enough to heat the interior of the pans up to 100 degrees or so.   The castings, still in the mold, go from the pressure tank into the warming chamber for 10 minutes or so to fully cure. 

If I am making a couple different castings I alternate molds, preparing one while curing the other so it really doesn't add that much time to the overall process.

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 Posted: Thu May 26th, 2011 06:20 pm
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pipopak
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Being married to a dentist I got used to dental materials. My preferred casting media is finely ground clear acrylic and solvent. Make my molds out of rubber, fill with powdered acrylic, flood with solvent, add more plastic on top as needed and wait.



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 Posted: Thu May 26th, 2011 11:24 pm
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dave1905
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Here is a mold frame:



Here is how the 2 frames fit together:



The master in the female frame with the retaining rods in place:



The male and female molds in the frames:


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 Posted: Thu May 26th, 2011 11:29 pm
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dave1905
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The gons are cast with 4 board high sides and then cut down to 3, 2 or 1 board high to match various prototypes.





The gon and the P&R boxcar in the back are both homemade resin castings.



This class NMa caboose has a cast resin roof on a Bachmann caboose body.


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 Posted: Tue Jun 28th, 2011 02:59 pm
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sledhead
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Has anyone tried one of these as an air removal device?

http://www.amazon.com/iTouchless-Sealer-Automatic-Vacuum-Container/dp/tech-data/B000N5WJUG

Seems like an inexpensive way to de-air a casting, but it does not specify how much of a vacuum it creates, too little, and the bubbles won't burst, they'll just get larger.

Last edited on Tue Jun 28th, 2011 03:00 pm by sledhead



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 Posted: Tue Jun 28th, 2011 03:01 pm
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sledhead
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BTW dave, those are some really nice cars. I hope mine turn out as well. Do you cast your own trucks as well?



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 Posted: Tue Jun 28th, 2011 06:10 pm
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dave1905
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Thanks.

Nope, I use a mix of MDC, AHM and Tahoe trucks with IM semi-scale code 88 wheelsets.

Last edited on Tue Jun 28th, 2011 06:10 pm by dave1905

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 Posted: Tue Jun 28th, 2011 11:10 pm
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ON30Carl
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I like your cars Dave,
I want to try to cast some high side
gon's in the future.
For now I'm stuck in the "CLOSET FROM HELL"
Carl:doh:

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 Posted: Tue Jun 28th, 2011 11:13 pm
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pipopak
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sledhead wrote: Has anyone tried one of these as an air removal device?

http://www.amazon.com/iTouchless-Sealer-Automatic-Vacuum-Container/dp/tech-data/B000N5WJUG

Seems like an inexpensive way to de-air a casting, but it does not specify how much of a vacuum it creates, too little, and the bubbles won't burst, they'll just get larger.
This is what I use:
http://www.etoolcart.com/mityvac-brake-bleed-kit-mv8020.aspx
Not top notch but good enough. HIH.



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 Posted: Wed Jun 29th, 2011 12:29 am
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Herb Kephart
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Carl wrote-

For now I'm stuck in the "CLOSET FROM HELL"

Hah--you didn't put a doorknob on the inside, I'll bet!



Herb  :old dude:



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