Author Topic: Home made casting  (Read 2674 times)

Offline kitnut617

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Home made casting
« on: May 21, 2012, 06:58:14 AM »
Well I took the plunge, I'm attempting to copy some engine nacelles for the very first time. 

I've made myself a casting box, in this case a short length of ABS pipe which I can use over and over again for various things. Next I cleaned up the part I want to copy, attached a lump of modeliing clay to create a pour lug, then attached it to my base with a screw.  I had drilled a small pilot hole in the part so the screw would self-tap into it.

I'm using an Aluminite casting kit (which is made by Corning) and so far I've mixed up a quantity of silicone rubber and it's now poured over the part I'm copying.

In the next 24 hrs I'll find out how it turned out ----

Offline GTX_Admin

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Re: Home made casting
« Reply #1 on: May 21, 2012, 09:10:43 AM »
Good luck!
All hail the God of Frustration!!!

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But you can make the Bastard work for it.

Offline Frank3k

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Re: Home made casting
« Reply #2 on: May 22, 2012, 12:11:37 AM »
If you're going to get into casting your own parts, but a small Legos bucket. You can build a mold box of just the right size for your masters and the rubber doesn't stick to the Legos.

Offline kitnut617

  • Measures the actual aircraft before modelling it...we have the photographic evidence.
  • I'd rather be dirtbike riding
Re: Home made casting
« Reply #3 on: May 22, 2012, 02:33:40 AM »
Thanks for the tip Frank, down in the crawlspace, we still have all our son's toy boxes.  There's a big box of Lego down there so I might give that a go.

The mould has cured and I've extracted it out of my mould box, and got the master part out too without any problems.  Looking as best I can inside the mould, it looks pretty good, can't see any bubbles (something I was warned about) and the relatively simple detail to the air intake seems to be OK.  I am now going to try to cast a replica ----

Offline Frank3k

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Re: Home made casting
« Reply #4 on: May 22, 2012, 06:22:20 AM »
Another tip - pour some talc into the mold before pouring the resin in. Shake it up to make sure the inside of the mold is coated in talc, then pour out the excess. Now when you pour the resin in, the talc will suck the liquid in towards the surface of the mold, eliminating many surface bubbles. It's the poor man's (or hobbyist) equivalent of pressure casting, in therms of results.
The talc won't affect the resin in any noticeable way.

Offline kitnut617

  • Measures the actual aircraft before modelling it...we have the photographic evidence.
  • I'd rather be dirtbike riding
Re: Home made casting
« Reply #5 on: May 24, 2012, 01:37:50 AM »
Success !!!

but only after a couple of problems to begin with.

I had bought a casting kit quite a few years ago and when I went to start this I found the tub of rubber was just that, a tub of rubber.  Over the years it had set itself.  So I bought a tub of fresh silicone rubber and a bottle of catalist, the mould turned out very well considering it was my first attempt.  But the 2-Part resin material had also 'gone-off', it would turn itself into resin when you mixed it up but the consistancy was like porridge, so back to the store to buy some fresh stuff.

Instant results when I used this new stuff --- the grey nacelle in the pics below is the original part.

Offline Doom!

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Re: Home made casting
« Reply #6 on: May 24, 2012, 02:29:50 AM »
Cool! Casting is something I haven't tried yet but eventually I would like to.
Doom!
Jeff G.

Offline GTX_Admin

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Re: Home made casting
« Reply #7 on: May 24, 2012, 04:14:31 AM »
Looking good.  So when do you start taking orders?
All hail the God of Frustration!!!

You can't outrun Death forever.
But you can make the Bastard work for it.

Offline elmayerle

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Re: Home made casting
« Reply #8 on: December 16, 2012, 02:46:00 AM »
This is instructive as I find myself looking to "clone" some vac-formed parts for a few efforts.