Search found 71 matches

by Finn Hammer
Fri Sep 22, 2017 4:08 pm
Forum: Images du Jour
Topic: Fusor progress, Finn Hammer
Replies: 25
Views: 9014

Re: Fusor progress, Finn Hammer

Bruce, All, I took some pictures off a 4" Conflat flange, produced by Kurt Lesker. The uniformity of the welding pattern reveals that this is an automated weld out of a welding robot, nevertheless it displays some of the same flaws that tarnished my own work: KurtLesker.jpg However, things tend to g...
by Finn Hammer
Thu Sep 21, 2017 9:08 pm
Forum: Images du Jour
Topic: Fusor progress, Finn Hammer
Replies: 25
Views: 9014

Re: Fusor progress, Finn Hammer

Richard, Good procedure, I should have thought of doing something like that, and not rush things. Bruce, Not so bad an idea to take photos. I wish it all looked like this: good.jpg Or even like this: also good.jpg Even this one looks acceptable, I see only surface slag: acceptable.jpg This shift has...
by Finn Hammer
Wed Sep 20, 2017 9:46 am
Forum: Images du Jour
Topic: Fusor progress, Finn Hammer
Replies: 25
Views: 9014

Re: Fusor progress, Finn Hammer

All, A picture of the poor mans conflat in my fusor shell main flange seam. conflat.jpg Something that is coming up soon, is designing the gas delivery system. Based on this discussion: http://www.fusor.net/board/viewtopic.php?f=24&t=2570&p=12080&hilit=gas+choke+valve#p12080 I have setteled on using...
by Finn Hammer
Mon Sep 18, 2017 3:27 pm
Forum: Images du Jour
Topic: Fusor progress, Finn Hammer
Replies: 25
Views: 9014

Fusor progress, Finn Hammer

All, I am about finished welding the fusor parts together, and today I was able to test assemble the major part of my fusor. The diametre of the sphere is 256mm internal, close to 10". Material thickness is 3mm or 1/8" IMG_20170918_160927[1].jpg It looks a bit flattish, but it is not. On the right s...
by Finn Hammer
Tue Sep 12, 2017 7:25 pm
Forum: Images du Jour
Topic: A good deal.
Replies: 9
Views: 3192

Re: A good deal.

Bruce, No I did not check transducer fault, and when I do over in the computer/electronics lab, I get @001ACKP;FF, meaning that pressure is too high to test. I am starting to realize how ill equipped I am, having no powersupplies and PC's over in the mechanical workshop. I will look into that as a f...
by Finn Hammer
Tue Sep 12, 2017 1:50 pm
Forum: Images du Jour
Topic: A good deal.
Replies: 9
Views: 3192

Re: A good deal.

Andrew, I wonder what a proper trap would look like. Jerry, I had already cleaned the pump as described in the manual, and also filled it with the 55ml of DC704. Today I fitted a thermocouple thermometer to the heating element, and ran two separate pumpdowns, one with the thermocouple gauge, and one...
by Finn Hammer
Mon Sep 11, 2017 9:03 pm
Forum: Images du Jour
Topic: A good deal.
Replies: 9
Views: 3192

Re: A good deal.

Work to do? It looks like it is working just fine. Gas ballast opens the passage between the two stages to air to push out any condensable gases like water vapor and solvents. So if you were using it to desiccate something then you might use it but for general clean vacuum work stuff you dont need ...
by Finn Hammer
Mon Sep 11, 2017 6:43 pm
Forum: Images du Jour
Topic: A good deal.
Replies: 9
Views: 3192

A good deal.

This pump, a VBC Microtorr became mine for around 100USD, some time ago, and with my newly gained ability to measure pressure, I thought it was time to start it up and check how it performs. Of course, at that price, an Alcatel 3.4CFM pump is great in it's own right, when it comes with a small diffu...
by Finn Hammer
Sat Sep 09, 2017 9:50 am
Forum: Vacuum Technology (& FAQs)
Topic: MKS 901p
Replies: 58
Views: 34466

Re: MKS 901p

All, The 901P transducers are plentiful and cheap on Ebay right now, and I have been working with them the last month or so. Bruce Meager's post on interfacing with RS232 was most helpful to me, since this is the first time I have used that interface. I am using an Arduino to query the 901P about th...
by Finn Hammer
Thu Aug 24, 2017 9:12 am
Forum: Vacuum Technology (& FAQs)
Topic: Diffusion pump oil sources?
Replies: 11
Views: 3331

Re: Diffusion pump oil sources?

John Futter wrote:I cannot fathom this post a litre costs US$42 -the cheapest on ebay
many other suppliers
John,

I too have been unsuccesful in finding that US$42 per litre seller on Ebay.
Would you mind posting a direct link to that auction/seller, please?

Cheers, Finn Hammer