Fusor Forums

I think I fried bearings on a varian pump by running it without cooling and it was connected to a SEM, so no gas load. So watch it, I would at least put a muffin fan on it like in the manual.

On deposition system all the power feedthroughs are covered with a cap that kind of looks like a copper pipe end cap with a hole in the center. The conductor passes though and the concave side covers a portion of the insulator. This creates a "shadow" and prevents material from coating the insulator...

Manual is here, its kind of awful, I use a similar vintage pump in my SEM. https://fusor.net/board/viewtopic.php?t=8021 Pumping unit turns on a relay that can control the fore pump and the turbo I believe. Heater is for baking out, rarely used. First thing I would do is change the oil, it uses the s...

Im betting you dont have as low foreline pressure as you thing you do. The nt-50 will light fail if the drive does not see fast enough acceleration and that is usually from too high of pressure.

Get a chunk of leaded glass if you are having x-ray problems. For you and the camera.

I replaced one in a large 1000l/s pfeiffer, pretty easy. I found a company that made Steel/SiC bearings and selected one the right size. The only difference was the plastic keeper for the balls was different but I was able to transfer from the old to the new. Alpine Bearing makes a lit of bearing ki...

How much is it heating up? Its going to heat up some what just dropping the 80v to the logic levels a lot of the circuitry runs at. But generally speaking, something is wrong. I would put a scope across your power supply and see if you see a power sag when the turbo tries to start up. I have had an ...

Sounds dead to me. But make sure your switch is connected to ground and not 24v. It pulls the start switch low to start.

About the only thing I have worried about reforming is my big yag laser welder. It sat for about 15 years before I powered it up. To reform the caps on that I used a 300v power supply and charged the bank up over a period. Seemed to work fine, nothing blew up when I connected it to mains. Im not sur...

The preamp and amp circuits for the faraday cup designs are out there. I have the schematics for the quadrex RGAs, should be easy enough to copy. But I still would never want to build a RGA. I have other things I would rather be not doing. lol Yeah, we were looking at possibly just recoating the cha...