Search found 285 matches

by David Kunkle
Tue Apr 10, 2018 11:02 pm
Forum: The Trading Post
Topic: David Kunkle's Store- For Sale
Replies: 0
Views: 1099

David Kunkle's Store- For Sale

Finally put stuff I no longer need on ebay. Over 40 items and counting.

https://www.ebay.com/sch/kunkle11/m.htm ... 7675.l2562
by David Kunkle
Wed Nov 15, 2017 4:54 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Increasing the useful life of bubble detector tubes
Replies: 13
Views: 2386

Re: Increasing the useful life of bubble detector tubes

Here is the final word on the water idea: (Although, if your detector is over a year old and no doubt on its way out- could probably only help.) Hi David, Thank you for your email and question. We had thought of adding some water to the tube many years ago. You are correct in that it would help in t...
by David Kunkle
Thu Nov 02, 2017 3:55 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Increasing the useful life of bubble detector tubes
Replies: 13
Views: 2386

Re: Increasing the useful life of bubble detector tubes

"1. Water diffusing out of the detector tube. Storing the tubes in their sealed storage container retards mechanism 1, so one should keep the tubes in the storage container when not in use. " If this is the case, putting a drop of water in the aluminum tube would keep the relative humidity at 100% i...
by David Kunkle
Tue Aug 22, 2017 10:42 pm
Forum: Vacuum Technology (& FAQs)
Topic: Noisy Edwards EXT250 Pump
Replies: 22
Views: 4037

Re: Noisy Edwards EXT250 Pump

I read a while ago that the smaller pumps like the 50 or 70 lps turbos were a lot more bulletproof and less prone to bearing failure. I believe those are big enough for most fusor chambers. You may want to consider something along those lines.
by David Kunkle
Tue Aug 22, 2017 2:37 pm
Forum: Vacuum Technology (& FAQs)
Topic: Noisy Edwards EXT250 Pump
Replies: 22
Views: 4037

Re: Noisy Edwards EXT250 Pump

I managed to dig up the schematic for the controller. Only had a hard copy to scan in. Don't remember where I got it. You should be able to see the original wiring diagram thru my scribbling. My writing is how my non-electrical engineering degreed brain wired mine. Bottom of pg. 8 is what # wires I ...
by David Kunkle
Fri Aug 18, 2017 3:58 pm
Forum: Vacuum Technology (& FAQs)
Topic: TMP Diagnosis
Replies: 29
Views: 3005

Re: TMP Diagnosis

I'll second what Dennis said about the 2 stage pump and need for a thermocouple gauge. At least the thermocouple first- that way you'll be able to see where you're at with the 2 stage pump. It is a "must have" if you intend to go any further. You may as well post a video of spinning the turbine blad...
by David Kunkle
Wed Aug 16, 2017 3:54 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Steven Haid's Fusor
Replies: 9
Views: 1976

Re: Steven Haid's Fusor

"The Geiger counter reading during the 3rd interval was 900 CPM. The background count rate in my basement is 25 CPM. I was not expecting that high a count rate on the Geiger counter. The viewport window is on the opposite side of the chamber from the Geiger counter, so it was not picking up X-Rays t...
by David Kunkle
Sat Aug 12, 2017 2:28 pm
Forum: Vacuum Technology (& FAQs)
Topic: TMP Diagnosis
Replies: 29
Views: 3005

Re: TMP Diagnosis

No, the oil or grease is only supposed to be on the upper and lower bearings that support the rotor shaft. This keeps the bearings from wearing down- not the rotor. The rotors' only job is to spin quietly in a vacuum- they never actually touch anything.
by David Kunkle
Sat Aug 12, 2017 3:22 am
Forum: Vacuum Technology (& FAQs)
Topic: TMP Diagnosis
Replies: 29
Views: 3005

Re: TMP Diagnosis

If oil was coming out the inlet port that connects to your vacuum chamber, I have little doubt that oil is covering your rotors and the rest of your insides, and that is your entire problem. Not quite sure how oil spilled out and "soaked" it. The oil is probably causing a lot of drag making it stumb...
by David Kunkle
Sat Aug 12, 2017 2:51 am
Forum: Fusor and/or General Fusion Theory (& FAQs)
Topic: Fusor without inner grid?
Replies: 13
Views: 5047

Re: Fusor without inner grid?

I hope you can get access to an MRI. Would certainly be cool to try it out, but I will be surprised if anyone allows your experiment. Did you actually talk to anyone that has direct authority over the scanners? Because... "Everything of course of non-magnetic material: glass and aluminium perhaps, o...