Search found 105 matches

by Bruce Meagher
Wed Jun 06, 2018 8:23 pm
Forum: Images du Jour
Topic: Gold Plasma
Replies: 7
Views: 599

Re: Gold Plasma

Great suggestions Rich. Two experiments to add to the list.

Bruce
by Bruce Meagher
Mon Jun 04, 2018 2:53 pm
Forum: Images du Jour
Topic: Gold Plasma
Replies: 7
Views: 599

Re: Gold Plasma

The machine is a small gold sputter coater. Turning pure silver coins into gold... now that's just straight up good magic.
by Bruce Meagher
Fri May 25, 2018 11:05 pm
Forum: Vacuum Technology (& FAQs)
Topic: Reverse engineering the Instrutech IGM-400
Replies: 7
Views: 872

Re: Reverse engineering the Instrutech IGM-400

I can confirm all three of mine only have one filament. They measured approximately 0.14Ω. I couldn't get a good picture of the inside without destroying one so I cannot tell if these are yttria coated iridium or tungsten filaments. However, looking at the numbering IMG402YBX seems to indicate yttri...
by Bruce Meagher
Thu May 24, 2018 10:42 pm
Forum: Vacuum Technology (& FAQs)
Topic: Reverse engineering the Instrutech IGM-400
Replies: 7
Views: 872

Re: Reverse engineering the Instrutech IGM-400

I ordered three of these gauges. One works as Lukas describes but the other two failed. I need to replace the electrolytic capacitors to see if this is the issue. The pressure output on the working gauge matched my Inficon gauge closely. The voltages are different in the picture below because the tw...
by Bruce Meagher
Wed May 23, 2018 9:14 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: TIG welding tubing and flanges with an automated fixture
Replies: 8
Views: 1270

Re: TIG welding tubing and flanges with an automated fixture

Very nice orbital welder! I’ve hope to stumble across an Orbitalum, Swagelok, or the like for cheap, but I think they are too rare and too desirable to show up secondhand at an affordable price. Are you using a little Arduino to control and drive the stepper motor?
by Bruce Meagher
Tue May 22, 2018 2:04 am
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum Pump Issues
Replies: 8
Views: 520

Re: Vacuum Pump Issues

I believe the recommended oil for your pump is Pfeiffer P3 oil. If you’re set on a Duniway brand oil I’d call and ask for their equivalent. I’ve personally had good luck with VacOil, and their cross reference chart says VacOil 195 is equivalent to Pfeiffer P3. I’m curious to know how much a simple o...
by Bruce Meagher
Mon May 21, 2018 9:09 pm
Forum: Vacuum Technology (& FAQs)
Topic: Foreline pump base pressure degraded
Replies: 10
Views: 969

Re: Foreline pump base pressure degraded

Ian, After helping Tyler through his pump rebuild it’s not evident the parts in the minor rebuild will have much impact on performance. There are a couple o-rings inside that could be leaking, but I'd think this would be unlikely. Of course cleaning during the rebuild process could make a huge impac...
by Bruce Meagher
Mon May 21, 2018 8:24 pm
Forum: Vacuum Technology (& FAQs)
Topic: Vacuum Pump Issues
Replies: 8
Views: 520

Re: Vacuum Pump Issues

Using cheap vacuum oil in your deluxe scientific vacuum pump was a mistake. See https://vacaero.com/information-resources/vacuum-pump-technology-education-and-training/988-oil-for-vacuum-pumps.html and https://vacaero.com/information-resources/vac-aero-training/24460-vacuum-pump-oil.html for a good ...
by Bruce Meagher
Fri May 18, 2018 9:57 pm
Forum: The Trading Post
Topic: MKS 901p vacuum gauges
Replies: 7
Views: 785

MKS 901p vacuum gauges

A bunch of MKS 901p vacuum gauges recently showed up on eBay. I’d recommend grabbing one, or a few, for your vacuum projects. Unlike the thermocouple gauges these don’t require a special controller. A simple 15V power supply and a PC / Mac is all you need (or one of Finn’s beautiful controllers). Al...
by Bruce Meagher
Tue May 15, 2018 6:58 am
Forum: Images du Jour
Topic: Corrosion cleanup yet again
Replies: 6
Views: 681

Re: Corrosion cleanup yet again

For greasy parts I’ve found a liberal amount Gunk engine degreaser gel, a little time, some scrubbing, with a good rinse, works well. Then a Simple Green scrub and wash leaves most parts plenty clean for my painting needs. A thorough water rinse is a critical part of this process. As the label says ...