Anyone know how to set up a small degassing chamber!

[tomstrong]

You wouldn't be able to tap the glass but you could tap the side wall from the chamber instead. I agree that any sort of thin glass would be a problem but there are a lot of thick tabletops out there, the hard part is finding somewhere that cuts to order instead of selling tempered tops, if you try to cut tempered glass it'll shatter rather than cut.

I'm familiar with the glass bell jars, the way around having to put a fitting in the glass was usually to put the fitting in the base instead, then lay a rubber gasket on the base and let the jar seal against that. I've seen small ones as thin as a little under 1/4", big ones I've seen get close to 1/2" thick but that's about the biggest I've seen.

 

[Fireball Joe]

sskunky, I made the RTV gasket in-place on top of the pipe. I made two dams from duct tape on the top of the pipe, one around the inside diameter and the other around the outside diameter. Then I poured the RTV (Shore 30A) into the dam and let it set. Remove the duct tape and trim the top edges a little and the gasket was done. It can be pulled off the top of the pipe, but I have left in place because I don't want to mess up the alignment to the pipe. There are better ways to make a gasket, but in this case I had some extra rubber left over after a pour and I didn't want it to go to waste. I had to come up with a dam structure pretty quick! It works wonderfully, and the weight of the lid is enough to seal the gasket so the chamber starts losing air as soon as the pump starts up.

I'll echo the other opinions here-- glass is a no-no for a hobby-style degassing chamber. Lexan (polycarbonate) is the way to go.

 

[sskunky]

Thanks! So simple, I don't know why I didn't think of that. I've used that dam method for resin before.