Mold making.

Re: Mold making.

Postby jmass » Wed Feb 01, 2017 7:59 pm

015.JPG
first attempt at resin casting. did not use enough for bottom and top. also found out you do not have much time to pour the resin as it hardens very quickly. i will try again tommorow. could not get a better picture as my camera kinda sucks.
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Re: Mold making.

Postby TiTan downunder » Wed Feb 01, 2017 8:10 pm

If you can, get your hands on some colorant to add to the mix. I use a tiny amount of black which, gives a light grey casting. Makes it much easier to see the air bubbles, etc.

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Re: Mold making.

Postby Graandpa » Wed Feb 01, 2017 11:54 pm

When making molds of pieces flat on the back like the sides and ends of a box car they have to be fastened to a flat surface so the mold material can't get. underneath. Try rubber cement. Wet the flat surface with the cement and put the part on it before it dries. After it dries, clean the excess cement around the part. Make a round, square or rectangular mold form from styrene to contain the mold material. Coat the mold and everything inside it with mold release. Pour the mold. You should be able to take the mold out of the form easily. If you want to recover the original part, loosen it with a #17 or #18 Xacto chisel blade

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Re: Mold making.

Postby Bernd » Fri Feb 03, 2017 5:14 pm

If have some time read this post on resin casting.

http://www.finescalerr.com/smf/index.php?topic=1024.0

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Re: Mold making.

Postby jmass » Thu Feb 09, 2017 1:33 pm

https://youtu.be/x16K3uqSpagmy third attempt at resin casting boxcar. happy with the outcome but am having a problem with the roof as the overhangs keep breaking off. also theres a slight hole in one of the sides but i can cover that with paint. could not directly download from youtube for some reason.
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Re: Mold making.

Postby ConnRiver » Thu Feb 09, 2017 2:34 pm

I'm a subscriber to Instructables so I don't know how accessible its classes are to non-subscribers. This mold-making class is listed as free this week, so it might be worth checking into. (Love the Instructables site.)

https://mail.google.com/mail/ca/u/0/#in ... 11aae29b66
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Re: Mold making.

Postby modorney » Thu Feb 09, 2017 6:32 pm

Around whre I live, I often find construction sites with piles of scrap water main pipes. These are short pieces of 12 inch (or larger) plastic pipe. I use these to make a vacuum chamber, with half inch plastic tops and bottoms.

To remove air bubbles, I vacuum them down with this :
http://www.harborfreight.com/brake-blee ... 60770.html
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Re: Mold making.

Postby Graandpa » Mon Mar 06, 2017 1:35 pm

Glue the original parts to a flat surface of an incompatible material with white glue. Rubber cement will work if you do it wet
(It works like contact cement, if you let it dry before joining and is difficult to separate). After making the mold, pry the parts apart gently. Wet any trouble spots with water.

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