skullbrain.org :: View topic - DIY pressure pot?

WeKillYou wrote:

Also, do you already have a vacuum chamber for your silicone? If not your mold will get distorted in the pressure pot

mondocoyote wrote:

WeKillYou wrote:

Also, do you already have a vacuum chamber for your silicone? If not your mold will get distorted in the pressure pot

I have read that if you pressure cure your silicon you eliminate bubbles the same way you would your resin. No bubbles, no distortion. I do both just to be sure, but I do wonder if I am altering the silicon's elasticity by curing under a high pressure.

ButcherBrand wrote:

I've been experimenting lately also with pressurizing the silicone as it cures in the pot, and using the pot to cast as well. So far so good but not sure about mold life. I'll let you know what happens.

mondocoyote wrote:

ButcherBrand wrote:

So you aren't vacuuming your silicon at all?

mondocoyote wrote:

WeKillYou wrote:

Also, do you already have a vacuum chamber for your silicone? If not your mold will get distorted in the pressure pot

uh oh wrote:

I recently went old school and got some Lego's. So much easier than building boxes out of foam core.

Also, the Harbor Freight pressure pot is the way to go. A few mods you need to do but it's pretty simple.

computerhair415 wrote:

mondocoyote wrote:

WeKillYou wrote:

Also, do you already have a vacuum chamber for your silicone? If not your mold will get distorted in the pressure pot

I have always wondered that my self that is why I had never tried it, But Im going to now. I dont own a vacuum chamber yet I hope this helps my pickel problem :lol:

ribbon controller wrote:

so just got my pressure pot.. wondering how long to leave my mold in it curing? the whole time? or just a lil while for bubbles to get out.. same goes for my resins I;m using.. how long do others leave there's in for?

also wondering if I need to buy any extra gear for my pressure pot?

Author:	kroker [ Sat Nov 12, 2011 1:49 am ]
Post subject:	DIY pressure pot?
any links? There was an old thread but I can't find it. thanks

Author:	computerhair415 [ Sat Nov 12, 2011 8:22 am ]
Post subject:	Re: DIY pressure pot?
When I was researching for myself I looked around the net and really didn't find any great ones. I think the problem is finding something that can hold up to that amount of pressure. I do mine pressure casting up 40lbs of pressure wich is kinda a lot for something that isn't made out of steel to handle. It may work for the for a while but you dont want to be around it if it fails. Harbor freight has them pretty cheap. I got my pot and a pancake compressor for about $150 ou the door. Good luck man

Author:	kroker [ Sat Nov 12, 2011 9:53 am ]
Post subject:	Re: DIY pressure pot?
so $150 for a proper pot you say? that's not bad, I'll just do that & avoid the hassle. thanks!

Author:	oOMoSOo [ Sat Nov 12, 2011 10:02 am ]
Post subject:	Re: DIY pressure pot?
Yeah just modification of an existing pressure paint pot will be your best bet, building something like that unless you weld and a very confident in your work could be very dangerous.

Author:	computerhair415 [ Sat Nov 12, 2011 12:58 pm ]
Post subject:	Re: DIY pressure pot?
Here's a link to the pot http://www.harborfreight.com/2-1-2-half ... 66839.html and heres a link to the compressor http://www.harborfreight.com/3-gallon-1 ... 95275.html those are the exact ones I got. They often have sales. If your thinking of getting one I would wait till some sort of christmas sale or something Hope this helps

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Author:	WeKillYou [ Sun Nov 13, 2011 12:48 pm ]
Post subject:	Re: DIY pressure pot?
I recently built mine from a Harbor Freight pot and this video helped me a bit: http://www.youtube.com/watch?v=hHIpGewFhnY if you want more pictures or info on my pt and the parts i added shoot me a PM! Also, do you already have a vacuum chamber for your silicone? If not your mold will get distorted in the pressure pot

Author:	kroker [ Sun Nov 13, 2011 8:06 pm ]
Post subject:	Re: DIY pressure pot?
cool thanks guys. vacuum chamber? no, it appears I've still got a bit to learn.

Author:	oOMoSOo [ Mon Nov 14, 2011 11:18 pm ]
Post subject:	Re: DIY pressure pot?
I personally find that the vacuum chambers are not completely necessary, useful for sure but I do fine without it. Now if you are using a platinum cure silicone or a silicone that cures fast (mine takes 6 hours) then a chamber would help tremendously. I use: http://www.smooth-on.com/Silicone-Rubber-an/c2_1113_1136/index.html

Author:	mondocoyote [ Tue Nov 15, 2011 12:06 am ]
Post subject:	Re: DIY pressure pot?
WeKillYou wrote: Also, do you already have a vacuum chamber for your silicone? If not your mold will get distorted in the pressure pot I have read that if you pressure cure your silicon you eliminate bubbles the same way you would your resin. No bubbles, no distortion. I do both just to be sure, but I do wonder if I am altering the silicon's elasticity by curing under a high pressure.

Author:	ButcherBrand [ Wed Nov 16, 2011 10:14 pm ]
Post subject:	Re: DIY pressure pot?
mondocoyote wrote: WeKillYou wrote: Also, do you already have a vacuum chamber for your silicone? If not your mold will get distorted in the pressure pot I have read that if you pressure cure your silicon you eliminate bubbles the same way you would your resin. No bubbles, no distortion. I do both just to be sure, but I do wonder if I am altering the silicon's elasticity by curing under a high pressure. I've been experimenting lately also with pressurizing the silicone as it cures in the pot, and using the pot to cast as well. So far so good but not sure about mold life. I'll let you know what happens.

Author:	mondocoyote [ Wed Nov 16, 2011 10:22 pm ]
Post subject:	Re: DIY pressure pot?
ButcherBrand wrote: I've been experimenting lately also with pressurizing the silicone as it cures in the pot, and using the pot to cast as well. So far so good but not sure about mold life. I'll let you know what happens. So you aren't vacuuming your silicon at all?

Author:	ButcherBrand [ Wed Nov 16, 2011 11:51 pm ]
Post subject:	Re: DIY pressure pot?
mondocoyote wrote: ButcherBrand wrote: I've been experimenting lately also with pressurizing the silicone as it cures in the pot, and using the pot to cast as well. So far so good but not sure about mold life. I'll let you know what happens. So you aren't vacuuming your silicon at all? Nope. Just mixing it, then pouring into the mold box about an arms length away. I then shake it a bit and put it into the pot and run it for an hour. So far so good. Have you seen the foil boxes Ricky and Luke are using for making molds? I need to try that sometime.

Author:	uh oh [ Thu Nov 17, 2011 12:10 am ]
Post subject:	Re: DIY pressure pot?
I recently went old school and got some Lego's. So much easier than building boxes out of foam core. Also, the Harbor Freight pressure pot is the way to go. A few mods you need to do but it's pretty simple.

Author:	ButcherBrand [ Thu Nov 17, 2011 6:40 am ]
Post subject:	Re: DIY pressure pot?
legos are awesome for boxes. i need a smaller base piece to fit into the pot tho. harbor freight is great for some items, just picked up a small air compressor and it rocks.

Author:	mondocoyote [ Mon Sep 10, 2012 5:07 pm ]
Post subject:	Re: DIY pressure pot?
I leave my molds in the pot until they are completely cured according to the tin. So usually 8hrs or so or overnight. The compressor kicks in every now and then to keep the tank topped up. With the resin I just leave in in until it is solid in the cup I poured it from.

Author:	ribbon controller [ Sat Sep 15, 2012 8:19 am ]
Post subject:	Re: DIY pressure pot?
I need to get an on/off valve dunno if theres a general one or some specific kind thats recommended.. I was gonna hit harbour freight for that too.. they seem to be the most affordable

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Author:	computerhair415 [ Thu Nov 17, 2011 8:19 am ]
Post subject:	Re: DIY pressure pot?
mondocoyote wrote: WeKillYou wrote: Also, do you already have a vacuum chamber for your silicone? If not your mold will get distorted in the pressure pot I have read that if you pressure cure your silicon you eliminate bubbles the same way you would your resin. No bubbles, no distortion. I do both just to be sure, but I do wonder if I am altering the silicon's elasticity by curing under a high pressure. I have always wondered that my self that is why I had never tried it, But Im going to now. I dont own a vacuum chamber yet I hope this helps my pickel problem

Author:	kroker [ Thu Nov 17, 2011 9:45 am ]
Post subject:	Re: DIY pressure pot?
uh oh wrote: I recently went old school and got some Lego's. So much easier than building boxes out of foam core. Also, the Harbor Freight pressure pot is the way to go. A few mods you need to do but it's pretty simple. yeah we got some fake legos mega blocks or something. it's way better that foam core IMO.

Author:	uh oh [ Fri Nov 18, 2011 10:36 pm ]
Post subject:	Re: DIY pressure pot?
computerhair415 wrote: mondocoyote wrote: WeKillYou wrote: Also, do you already have a vacuum chamber for your silicone? If not your mold will get distorted in the pressure pot I have read that if you pressure cure your silicon you eliminate bubbles the same way you would your resin. No bubbles, no distortion. I do both just to be sure, but I do wonder if I am altering the silicon's elasticity by curing under a high pressure. I have always wondered that my self that is why I had never tried it, But Im going to now. I dont own a vacuum chamber yet I hope this helps my pickel problem The pressure attempts to crush air bubbles which could just push them to the center of the silicone. The vacuum chamber actually removes all the air so bubbles disappear. One of my recent molds got wrecked because I let too much air in at once and it created a divot in the silicone where the air hit it.

Author:	ribbon controller [ Mon Sep 10, 2012 5:05 am ]
Post subject:	Re: DIY pressure pot?
so just got my pressure pot.. wondering how long to leave my mold in it curing? the whole time? or just a lil while for bubbles to get out.. same goes for my resins I;m using.. how long do others leave there's in for? also wondering if I need to buy any extra gear for my pressure pot?

Author:	computerhair415 [ Mon Sep 10, 2012 8:36 am ]
Post subject:	Re: DIY pressure pot?
ribbon controller wrote: so just got my pressure pot.. wondering how long to leave my mold in it curing? the whole time? or just a lil while for bubbles to get out.. same goes for my resins I;m using.. how long do others leave there's in for? also wondering if I need to buy any extra gear for my pressure pot? I leave my molds in the pot for about 20 min. I have a small leak, so I let it sit in the pot till the pressure is gone. The only other thing you might need for you pressure pot is on/off valve. Other than that you should be good! Good luck and can't wait to see what you make!

Author:	computerhair415 [ Sat Sep 15, 2012 9:24 am ]
Post subject:	Re: DIY pressure pot?
I Just brought the lid with me so I could get the right size. Have fun!

Author:	ribbon controller [ Sun Sep 16, 2012 1:32 pm ]
Post subject:	Re: DIY pressure pot?
sounds good.. thanks

Author:	uh oh [ Sun Sep 16, 2012 6:51 pm ]
Post subject:	Re: DIY pressure pot?
You just need to know what size fittings you're using or get adapters. I got a kit for $20 at Lowe's that has all the fittings and adapters you'd need.