Hi Bill...
Welcome to VacuumX.
Good questions, some answers should be forthcoming from some of the members soon. In the mean time, there is a lot of information that you can check in the VacuumX Group's files, photo's and link's sections on the web page while you are waiting for answers.
Ken Hunter
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--- In VacuumX@..., "B." <bill177@...> wrote:
Hello Group
This is my first posting to the group.
I am in the process of preliminary thoughts relating to a coating system. I was looking for information to look at designing and constructing a diffusion pump verses purchasing one, off coarse sizing is part of the process to. The size of the containment is or will be 36" in diameter @ 14 inches in depth, so approximately 8.25 sq.ft. internal volume minus internal components.
I have at my disposal a reasonably complete machine shop so this aspect is complete.
So that being said....
1. Is there a rule of thumb for sizing the Roughing pump for reasonable pump and makeup due to degassing time?
2. Same Q relating to the diffusion pump?
3. More Q's guaranteed, relating to instrumentation etc.
Thanks and look forward to your responses.
Bill
