Search found 22 matches

by Tyler Meagher
Sun Mar 24, 2019 9:10 pm
Forum: Images du Jour
Topic: Tyler's Demo Fusor
Replies: 7
Views: 3318

Re: Tyler's Demo Fusor

You are right. My demo fusor does not have a standard outer grid or a grounded metal shell. I have a top metal plate connected to ground. I get a poissor in the middle of the grid and a jet out one side when the pressure is low enough. I do not understand how it works. I am going to put a metal band...
by Tyler Meagher
Fri Mar 22, 2019 7:19 pm
Forum: Images du Jour
Topic: Tyler's Demo Fusor
Replies: 7
Views: 3318

Re: Tyler's Demo Fusor

I ran the experiment Rich recommended with a high voltage diode. The pictures below show the demo fusor in three different configurations. 1) No diode. 2) Diode arrow pointing away from the transformer. 3) Diode arrow pointing to the transformer. The oscilloscope traces are the high voltage output a...
by Tyler Meagher
Fri Feb 08, 2019 2:53 am
Forum: Images du Jour
Topic: Tyler's Demo Fusor
Replies: 7
Views: 3318

Re: Tyler's Demo Fusor

Rich and Dennis, thank you for your comments. I do wear safety glasses when working in the shop and lab. I have a procedure I follow when I operate my demo fusor’s power supply. After each run the variac is set to zero, I turn off the power strip, and then I unplug the variac. The variac is always u...
by Tyler Meagher
Wed Feb 06, 2019 3:23 am
Forum: Images du Jour
Topic: Tyler's Demo Fusor
Replies: 7
Views: 3318

Tyler's Demo Fusor

I built a small demo fusor using my rebuilt Pfeiffer Duo 1.5A vacuum pump, a pickle jar, vacuum bagging sealant (tape), a spark plug, a variac, a microwave oven transformer, and a 20K ohm ballast resistor. I put the pickle jar vacuum chamber in a clear plastic trashcan for safety. Below are some pic...
by Tyler Meagher
Mon Jun 04, 2018 3:58 am
Forum: Images du Jour
Topic: Gold Plasma
Replies: 7
Views: 2957

Gold Plasma

I wanted to make some plasma with my vacuum pump. I used the magical gold plasma machine. I put a silver coin into the plasma and it turned gold. Sometime later I’ll figure out how it works.

Tyler
by Tyler Meagher
Sun Jun 03, 2018 1:55 am
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum pump rebuild
Replies: 55
Views: 20627

Re: Vacuum pump rebuild

My pump worked great! The pressure was below 1 millitorr on my MKS gauge after an overnight run. The experiment I just finished running was to learn about something called vapor pressure. My experiment was to replace the VacOil 20 with cheap oil from Amazon. The vacuum oil you use for air conditione...
by Tyler Meagher
Wed May 30, 2018 12:55 am
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum pump rebuild
Replies: 55
Views: 20627

Re: Vacuum pump rebuild

The first picture is a pump down curve of my vacuum pump. It was taken at the inlet of the pump. There was just the tee and the MKS 901p gauge. It does not take long to get below 10 millitorr. Then my dad had me change the oil with some cheap Amazon oil as an experiment. This is the same oil Samuel ...
by Tyler Meagher
Wed May 23, 2018 2:59 pm
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum pump rebuild
Replies: 55
Views: 20627

Re: Vacuum pump rebuild

I tried the metal exhaust valve again. It worked fine. No weird behavior. I then put the spring and rubber exhaust valve back in. It worked the same. Draining the oil and removing the case two times didn’t take too long. I was wrong when I said the metal exhaust valve was causing the weird behavior....
by Tyler Meagher
Mon May 21, 2018 12:28 am
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum Pump Issues
Replies: 8
Views: 3534

Re: Vacuum Pump Issues

Your pump is similar to the pump I just rebuilt. I do not think the problem is because of the seal on the case. The seal on the case keeps the oil from leaking out. It does not have anything to do with the vacuum. The inside of the case is at atmosphere pressure. The pump inside is sealed to the fac...
by Tyler Meagher
Wed May 16, 2018 2:57 pm
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum pump rebuild
Replies: 55
Views: 20627

Re: Vacuum pump rebuild

Thanks everyone for all your comments. I ran the pump for 24 hours. I was happy to find the pressure at 9.5E-4 torr on the pirani gauge. The thermocouple gauge was at 0. The pump was very hot when I touched it. I tried a second MKS 901p pirari gauge. It was 2 millitorr after about an hour. I underst...