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Ah yes, thanks Drew, I see the difference in that flange. The second one I posted last night looks a bit simpler and has an 8" CF on each end. It's this one: https://www.ebay.com/itm/234484099785 I

Dave, It looks ok except for that top most interface. with only 4 bolts across what looks to be 6" dia I am not sure that is a "fitting" interface. It may be expecting to be bolted down to a thick

Hello Dave, funny you mention this... I finally got my cart (old Beckman ultracentrifuge over to TX from NM. Yeah, it's still on the trailer, but I have to clean it off to haul back there at the

Or perhaps: https://www.ebay.com/itm/234484099785 That one seems a bit simpler. I see 8" conflat blanks and gaskets aren't absurdly expensive. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

Hello learned colleagues, I'm hoping to pick your brains for a little advice. I am trying to put together a small vacuum system for basic experimentation/exploration/education with plasmas of various

No argument there, but I have little choice. Oh you could so master it if you felt like it. Sounds like you're having serious fun, though! -Dave -- Dave McGuire, AK4HZ New Kensington, PA

you work too much bud...... I have proof the universal electronics gremlins hate me..... right now I am seeing my warp drive thruster suck power out of a digital HV power supply that is turned off and

I run two companies and a public museum...I never get bored. Exhausted, pretty much all the time, but never bored. I took on the Amray 1200 restoration project because I was desperate for a change of

if you get bored and want a commission, I will buy it off you once you get it working :_))))) I really do not like electronics as they hate me. Drew

I do have another one that I'd like to send on to a new home, but it probably needs more electronics work than you'd be up for, if I remember your aversion to "sparkies" correctly! ;) -Dave -- Dave

Thanks! It's been tedious, but worthwhile. Now for a hundred little adjustments and optimizations. -Dave -- Dave McGuire, AK4HZ New Kensington, P

very cool. Now I want one :_)))))

It's alive, nicely done!

Just following up on this (in bad form replying to my own message ;))...The attached photo tells the story! -Dave -- Dave McGuire, AK4HZ New Kensington, PA

Hello?Christopher, I think your in the right place.?My next project is a vacuum chamber for putting the aluminum coating on amateur telescope mirrors.I have (2) old Varian pumps,? a 1400 and 700,

It is easy to suppose that the inlet valve is leaking. This may be a spring steel flap? valve, where some dust particle might hold it off from sealing.I don't see an alternative to inspecting this

Christopher and other members of this group, I apologize for sending my stumbling inquiry about an A/C pump to this group.? I did so only because the group's core interest was not obvious from the

For anyone in Australia, i've got a vacuum chamber with thermostat heating (vacuum drying chamber with hinged door and glass window), and 2 or 3 vane pumps surplus. Can give more details.

At least you can replace your pump for around $150. Our pumps are more in the multiple thousands or even tens-of-thousands range. *"Always take the high road. There's less traffic."* *-Christopher

I am not sure this group is an ideal fit. Here we are fixated on vacuum chambers for metal coating processes of telescope mirrors and such. MUCH higher vacuum levels than what AC units need. *"Always