Intro: Vacuum Chamber
This is a simple one-valve vacuum chamber, where the same valve is used for in- and outlet of air.
As shown in the video below, you can use the valve as a trhottle, to initially limit the vacuum and foaming of resin and epoxy.
Step 1: Gasket Mold
Cut an 8x8mm groove in a piece of wood, the same diameter as your pot. I used an MPCNC with a 4mm endmill bit.
Step 2: Gasket
Press ProtoPutty into the groove, and cut off any excess putty.
For instructions on how to make ProtoPutty: youtu.be/7fwytA5r2Mw
Push the pot halfway into the putty, and again cut off any excess putty.
Leave to cure for a few hours.
Step 3: Lid and Fittings
Cut a hole in a 15mm acrylic plate, big enough to comfortably cover the pot.
I used a through-hull 1/2" fitting from a boat shop, with a valve and quick disconnect for the vacuum pump.
The gasket was cut from a silicone muffin mold.
Step 4: Prepare the Wood
Fixate the wood at the bottom the prevent it floating to the top.
Cover the wood with your stabiliser, Cactus Juice, or here Jatapol WR90N.
Step 5: Apply Vacuum
Start the vacuum pump with the valve closed. Slowly open the valve to control the foaming of the resin or epoxy.
Step 6: Soaking
After 1-2h, or when the bubbles stop, slowly let the air in again. Let the wood soak, according to the guidelines of your resin. Don't let the resin sit on the acrylic lid, as it will react with the lid, and cannot be cleaned after a few hours.