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Pressure Casting Equipment

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Re: Pressure Casting Equipment

Postby blind pig » Fri Mar 09, 2012 10:26 am

Anvils Hammer wrote:Then I just need to find a way to heat them a little.

Pour the resin at room temp and then put them in the pressure pots for 10 minutes untill cured but still soft, take them out of the pressure pots and leaving on a tray in the "curing oven" for another 20 mins or so..


Large cooking pot in a waterbath?
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Re: Pressure Casting Equipment

Postby Deadmeat30 » Fri Mar 09, 2012 4:07 pm

I don't have any spray guns, lol. I just pick my pressure pots up on Ebay for around 40 pounds. Got 3 now, 2 10 litres and a 5 gallon one.
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Re: Pressure Casting Equipment

Postby Magnetic Duckling » Mon Mar 19, 2012 10:08 pm

I happily put together the parts *plays tetris music* like Deadmeat showed me (thanks A LOT).
Here is what I got, I didn't screw the parts together yet, wanted to be sure before.
Please tell me if I did something wrong and am going to explode with my pressure pot.
Thanks and luv <3~
Image
Image
Oops forgot the tap on the compressor. Consider it added ^^;
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Re: Pressure Casting Equipment

Postby mangozac » Tue Mar 20, 2012 8:17 am

Looks great - apply some thread tape, do everything up and you'll be in business!
Oh yeah I can make that....
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Re: Pressure Casting Equipment

Postby Magnetic Duckling » Thu Mar 29, 2012 4:00 am

Yo, me again,
so sometimes when I put the whole thing under pressure, the pot starts leaking at 50~55psi from between the lid and the pot, where the rubber is. Am I cursed and got a faulty pot or is it something that happens sometimes ?
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Re: Pressure Casting Equipment

Postby Anvils Hammer » Thu Mar 29, 2012 4:21 am

Is there anything solid caught in the rim which could be interfering with the seal? Are all 4 clamps done up the SAME tightness?

both my pots leak a little bit.. its annoying but not enough to affect the curing resin..

also check this out-

http://www.ebay.co.uk/itm/edwards-vacuu ... 20c4304334

AH
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Re: Pressure Casting Equipment

Postby Magnetic Duckling » Thu Mar 29, 2012 4:25 am

Nothing more than a dust I think, I usually clean the rubber then all is fine but still fishy.
Clamps I do my best with my girly strength xD
When I mean leaking I mean it makes a big PSCHHHHHHHHHHHHH and depressurise 10 psi all a sudden.

Oh nice thanks *follows auction*
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Re: Pressure Casting Equipment

Postby mangozac » Thu Mar 29, 2012 8:05 am

Yeah that sounds like a bad lid seal. The gasket itself should be fine (although I do recall someone - maybe Blind Pig - recommending to coat it with vaseline to help it seal OK). Maybe I've just got girly hands, but I often had trouble doing up the wing-bolts on the clamps tight enough. I made a little wooden block with a slot in it which helped immensely, but when one of the clamp bolts broke I went with a much better solution as first recommended by Mark from Dream Forge:

Replace the wing-bolts with standard hex-headed (hex-cap) bolts. Then use a socket and ratchet (wrench) to do them up. I find it a little slower than doing it by hand, but I've not once had any lid sealing issues with it.
Oh yeah I can make that....
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Re: Pressure Casting Equipment

Postby blind pig » Thu Mar 29, 2012 11:13 am

mangozac wrote:Yeah that sounds like a bad lid seal. The gasket itself should be fine (although I do recall someone - maybe Blind Pig - recommending to coat it with vaseline to help it seal OK).


No!

Pressure + petroleum based lubricants can equal fire!

Use a silicone lubricant which you can buy from the plumbing section in Hardware stores (for lubricating taps) or at a SCUBA store.
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Re: Pressure Casting Equipment

Postby mangozac » Thu Mar 29, 2012 11:41 am

Ooops :oops:

OK maybe I actually remember you saying not to use Vaseline! Good to keep in mind though...
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Re: Pressure Casting Equipment

Postby Magnetic Duckling » Thu Mar 29, 2012 10:00 pm

blind pig wrote:No!

Pressure + petroleum based lubricants can equal fire!

Use a silicone lubricant which you can buy from the plumbing section in Hardware stores (for lubricating taps) or at a SCUBA store.


I knew zac was trying to get rid of me!!!111

I'll look that up then, thank you Blind Pig =)
(I had a nightmare where my pot failed... I think I have a problem)

ERM BUT there is a little bit of vaseline on my mold when I pressurize it, you know, for when I pour the second half of the mold on the first. So, will I die in pain or what whould I use Oo ?
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Re: Pressure Casting Equipment

Postby Fleafa » Thu Mar 29, 2012 10:58 pm

I've been using Vaseline to seal pressurised Lego mould boxes for a while now with great success...
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Re: Pressure Casting Equipment

Postby blind pig » Fri Mar 30, 2012 12:19 am

Fleafa wrote:I've been using Vaseline to seal pressurised Lego mould boxes for a while now with great success...


Yeah, I wouldn't. One day it may go balls-up. :lol:

It was drummed into me not to do when SCUBA training, and my big brother - a Clearance Diver for the Royal Australian Navy - when mental at me when I tried to use vasolene on something pressurised when I was a teenager.
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Re: Pressure Casting Equipment

Postby Magnetic Duckling » Fri Mar 30, 2012 12:20 am

Anything else we should not put under pressure, while we're at it? ^^;
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Re: Pressure Casting Equipment

Postby blind pig » Fri Mar 30, 2012 12:21 am

Magnetic Duckling wrote:Anything else we should not put under pressure, while we're at it? ^^;


Children and small animals
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