Thank you for the reply, Marcel. I need a glass or steel bell Jar with a vacuum pump But your approach is certainly creative. ----- Original Message ----- From: "Marcel Duchamp" To: "Microcontroller discussion list - Public." Sent: Friday, November 21, 2008 12:23 AM Subject: Re: [OT] Bell Jar > Rich wrote: >> I am looking for a very low cost bell jar and vacuum pump. Does anyone on >> the list have one that they would like to sell? I don't expect to pump >> down to ten to the minus 6 torr. But I want to get down to the lowest >> possible pressure (below 100 u) > > > Depending on what you need it for, you may find a pressure cooker works > for you. I used one for several years and you can probably find them in > second hand stores. New ones are probably in the range of $20 to $40 or > so. > > For mine, I used a canning pressure cooker that is something like 12 > quarts in size. A little vaseline on the edge and a rubber gasket > between that and a slab of 1" plexiglas for a lid will seal the deal. > > A hole was drilled and tapped and a plastic hose barb fitting for the > vacuum hose was inserted with teflon tape. Not quite as nice as a real > bell jar but it worked perfectly for de-airing two part RTV rubber for > mold making. > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist