Search found 178 matches

by Peter Schmelcher
Thu Jul 22, 2021 6:01 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Glassman PG Manual
Replies: 1
Views: 183

Re: Glassman PG Manual

I think this manual is close and would be useful if attempting a repair or changing the output polarity. It has some theory of operation, schematics and the location of parts on the circuit boards.
Glassman WG 90 and PS-PG .pdf
(2.06 MiB) Downloaded 23 times
-Peter
by Peter Schmelcher
Mon Jul 19, 2021 10:47 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High voltage power supplies in vacuum and on Mars
Replies: 3
Views: 660

Re: High voltage power supplies in vacuum and on Mars

Richard I though you’d like them. That level of design is an art form, a niche audience even for the folks that hangout here. My favorite gem was the multi-giga-ohm resistor that measured the Mars X-ray supply output voltage. Copper tape (proof-of-concept) stuck on the resistor’s side compensated th...
by Peter Schmelcher
Mon Jul 12, 2021 8:44 pm
Forum: Images du Jour
Topic: New Home for Doug's Fusor
Replies: 55
Views: 9013

Re: New Home for Doug's Fusor

Bob, I liked Doug’s backing pump solution but always worried about spinning a turbo continuously because ball bearings/lubricants have a lifetime and also his system was ultimately solar powered. My setup uses an ion pump running 24-7. I cobbled together a 3.5kV supply and by using two diodes and 4 ...
by Peter Schmelcher
Sun Jul 04, 2021 6:37 pm
Forum: Vacuum Technology (& FAQs)
Topic: Broken magnetic bearing
Replies: 8
Views: 1099

Re: Broken magnetic bearing

I think the question is what pump trauma caused the broken magnet? The field lines are pinched between the magnets using an aluminum washer spacer. The rotor starts spinning with its ball bearing in contact then takes off and centers on the pinched magnetic field. If that ball bearing seized before ...
by Peter Schmelcher
Sat Jul 03, 2021 6:00 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High voltage power supplies in vacuum and on Mars
Replies: 3
Views: 660

High voltage power supplies in vacuum and on Mars

I was looking for insulator voltage stress vs life time data and came across a NASA 2012 2-day conference on high voltage power supplies designed for “flight”. The entire conference was a teaching event. I watched the videos mostly at double speed playback, rewinding and slowing down if I missed som...
by Peter Schmelcher
Tue Jun 01, 2021 11:59 pm
Forum: Vacuum Technology (& FAQs)
Topic: Pressure spike when cycling gate valve
Replies: 5
Views: 682

Re: Pressure spike when cycling gate valve

I have a Varian butterfly valve that uses an o-ring shaft seal. I never rotate it because if I do it looks like a virtual leak for a day or so. Vacuum grease reduces the problem but a no o-ring system is better if you want a high vacuum.
by Peter Schmelcher
Tue May 04, 2021 12:49 am
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum Bearings for TMP-50
Replies: 7
Views: 1896

Re: Vacuum Bearings for TMP-50

Personally I would go with ceramic balls and then the choices get a bit more convoluted. Choose a better ABEC tolerance like 5 or 7 with a riveted ball cage or even better would be a fiber phenolic resin ball cage. Ceramic balls are stiffer and stronger than metal and will not weld to the metal race...
by Peter Schmelcher
Mon May 03, 2021 7:24 pm
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum Bearings for TMP-50
Replies: 7
Views: 1896

Re: Vacuum Bearings for TMP-50

Glasslinger is a fringe YouTube channel about repairing old radios and making vacuum tubes, the guy has got skill and talent. https://www.youtube.com/watch?v=jL0fXUZ4wFQ is a video about repairing a turbo and using ceramic ball bearings, also some bent blades are left out during the reassembly. Pump...
by Peter Schmelcher
Fri Feb 05, 2021 10:27 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Soldering Ceramics
Replies: 5
Views: 2567

Re: Soldering Ceramics

glass with metal surface.png For scale the neon sign glass tube is 6mm in diameter. It was heated while passing through a ring of hydrogen oxygen torch flames and today we would think of this as a 3D printing extruder. A reducing torch flame (with excess hydrogen) would leach oxygen from the glass ...
by Peter Schmelcher
Sat Jan 30, 2021 6:54 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Soldering Ceramics
Replies: 5
Views: 2567

Soldering Ceramics

Applied Science (YouTube channel) built an ultrasonic ceramic/glass soldering system Includes links to references. The guy goes all in and has good content. Aside: I usually watch YouTube using fast playback between x1.5 to x2.0, unfortunately for some clips the maximum playback speed is not fast en...

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