Magnetic Duckling wrote:I don't want to let it cure overnight without supervision.
mangozac wrote:Magnetic Duckling wrote:I don't want to let it cure overnight without supervision.
Why not? It's a waste of money buying the vacuum pump just for degassing the silicone when you can use pressure to crush the bubbles anyway. I pressurise the mould while it cures, although the Pinkysil only needs about 30 minutes (I leave it under pressure for an hour)!
mangozac wrote:Your issue of time has only two solutions like you suggest:
- Use a pressure pump to degas the silicone. This will require you to paint the degassed silicone into all of the detailed areas of the part before you pour the rest over it.
- Get a faster curing silicone.
Magnetic Duckling wrote:Split molds looks cool but I am not sure it would work out with my hollow parts. I am still thinking about it. I am afraid of damaging my original when slicing
mangozac wrote:8CFM = 0.41 minutes (24.6 seconds)
mangozac wrote:OK for starters, the calculations and times I reported in my original post are theoretical only and there are several factors which make the actual evacuation time longer. The most prominent is probably slight leaks in the plumbing that allow air in as it is vacuuming.
mangozac wrote:I don't think there would be 2L in the dome at the top of the pot. Maybe 1L might be closer?
mangozac wrote:Still, getting to a full -30inHg in 50-60 seconds is not bad. I'm guessing it reaches -27 in around 20 seconds?
mangozac wrote:If the volume of the pressure pot is too large you could fill it with materials to take up space: lead weights, gravel, etc. I have mine half filled with beach sand (although it makes a mess if I vent the vacuum too quickly!).
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