Search found 10694 matches

by Richard Hull
Mon Apr 23, 2018 4:34 am
Forum: Images du Jour
Topic: A ball bearing motor
Replies: 1
Views: 238

Re: A ball bearing motor

I made this "Marinov" Ball bearing motor back in 1994 and displayed it at one of the old Telsthons before they became the HEAS conferences. Typically runs at about 2.5 volts @ 50 amps just and aluminum shaft in two brass pillow blocks I milled out and inset ball bearings. Runs fine on AC or DC and c...
by Richard Hull
Fri Apr 20, 2018 4:55 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: My Gamma Spectroscopy Setup
Replies: 5
Views: 415

Re: My Gamma Spectroscopy Setup

In my area, LN2 is easy to get, (as long as you have a real dewar). It costs just a little less than cheap beer per liter. $2.25-$3.00 depending on price ups and downs. For demos of the meissner effect I have a little 10 liter dewar and run the demo about once a year. I have done it several times at...
by Richard Hull
Fri Apr 20, 2018 4:43 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Detector noise problem
Replies: 9
Views: 460

Re: Detector noise problem

If you look at the fusor IV's neutron detector you will see there is no cable between the preamp and the Rueter & Stokes 4 atm 3He tube. This is the ideal. I do run about 6 feet of coax from the preamp to the pulse shaper and SCA in my NIM bin. The first scope trace is a damped wave and might be ind...
by Richard Hull
Fri Apr 20, 2018 4:15 am
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum pump rebuild
Replies: 32
Views: 1746

Re: Vacuum pump rebuild

Rex did a good job on the 1402 oil reservoir. I love that he noted the vacuum didn't improve all that much, if at all. I have always said let the sleeping dog lie. I have two 1402's here. I rate them as one of the finest pumps ever made by anyone. I bought my first one over 18 years ago. It pumped d...
by Richard Hull
Fri Apr 20, 2018 3:34 am
Forum: Vacuum Technology (& FAQs)
Topic: Voltage/Pressure Tuning Advice
Replies: 9
Views: 433

Re: Voltage/Pressure Tuning Advice

More power is always better. You will still need a ballast resistor.

Richard Hull
by Richard Hull
Wed Apr 18, 2018 7:51 pm
Forum: Vacuum Technology (& FAQs)
Topic: Can I make my own ConFlat flanges?
Replies: 27
Views: 722

Re: Can I make my own ConFlat flanges?

No need to PM me.....I know zero about CNC beyond how cool it is and expensive to own. I know lot about lathe work and milling and I know I would never make one more vacuum fitting during my lifetime for less than $100.00/hr!!! I would be glad to make you a single 8" CF flange for $2300.00. Nuff sai...
by Richard Hull
Wed Apr 18, 2018 7:42 pm
Forum: Vacuum Technology (& FAQs)
Topic: Can I make my own ConFlat flanges?
Replies: 27
Views: 722

Re: Can I make my own ConFlat flanges?

I also hand turned and hand milled my first true fusor flanges, view port window and adaptors. Many hours and great fun at the time. When figured against a paying wage for my efforts versus the list price of true conflats. I would have been payed a bit over $1.00 per hour, once material costs were f...
by Richard Hull
Wed Apr 18, 2018 7:34 pm
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum pump rebuild
Replies: 32
Views: 1746

Re: Vacuum pump rebuild

I didn't want to say it, but Jerry is right on. #1 check out what really makes the vacuum. A nice, pretty, clean, smooth running motor married to it's special pump shell never makes a vacuum. This is why I love belt drive pumps. Quiet running and separate unit pump and motor. The pump system doesn't...
by Richard Hull
Wed Apr 18, 2018 7:12 pm
Forum: Vacuum Technology (& FAQs)
Topic: Voltage/Pressure Tuning Advice
Replies: 9
Views: 433

Re: Voltage/Pressure Tuning Advice

The ballast will help, however, all wonderful $$$$+ power supplies have an Achilles heel. They are so perfect and so well controlled in so many ways they typically make lousy fusor supplies. They are typically current controlled. Oddly, the manufacturer doesn't want you to burn up their supply..now ...
by Richard Hull
Tue Apr 17, 2018 7:30 pm
Forum: Vacuum Technology (& FAQs)
Topic: Can I make my own ConFlat flanges?
Replies: 27
Views: 722

Re: Can I make my own ConFlat flanges?

I went back and edited out the quotes and am sensitive to the needless quoting by many noobs and will continue to delete and edit out long needless quotes. As always, we, here, are smart enough to follow a thread from beginning to end without repeat-re-quotes within a single original posting. Richar...