I have a question from the replies. It was mentioned to drill holes at the crack ends, but I thought that was for cast iron. Does one do it for aluminum castings as well. :?: I also remember seeing some Youtube videos on welding cast aluminum, perhaps that would help you as well. Same reasons in bo...

Kinda wondering that too. I've seen some DIY projects that look like they cost more than a commercial cooler. I'm building mine now but was going to use a CPU water cooled radiator: http://www.amazon.com/gp/product/B007YLTHRK?psc=1&redirect=true&ref_=oh_aui_search_detailpage some case fans: ...

So that is the beauty of clecos. These are like temporary rivets. When you depress the button on the back it extends two prongs which you push through the hole. When you release, the spring pulls back and locks the layers together. So in your setup, you'd put them in all the holes and then remove th...

Oh, wow. That is a monster. I can see why endurance wouldn't be your bag. Lemons is more or less full contact racing lol. I think we average about 3 hits per race in the 5-10 mph category and a solid hit about every other race. Might be part of why they take the cages seriously... Fixing that kinda ...

All the race series have different rules and sometimes you can rule spec a cage, other times you can't. E30s can pretty easily pass lemons and chump though. Lemons will let some things fly when there really isn't a way around it but they are usually regarded as being more strict then Chump. The miat...

Chart says 12 gauge but I'd do 10 for a reasonable length power cable and 8 of you are going to put a long one on it. More than that and the wires in the wall will be the week point.

-Sandow

So what race series are you doing? I know in Lemons, this would fail tech because the belt bar is offset from the main hoop. It would be fine if it was just for the belts and there was a second structural tube connecting the main hoop to the diagonal lower down though. As it is, there is very little...

Clecos will make this a breeze.

http://www.amazon.com/Boulderfly-Cleco- ... B008PJYUTA

-Sandow

I suppose even running 45 cubic feet into it is really only $10 in argon and it will be entertaining to try if nothing else. I think I can run the leads in through the vacuum port and then seal off the seams and gaps with vinyl tape. There is already a hole at the top back that lets the air volume e...

So it is about 16 cubic feet which doesn't sound like much until I realized it would be 20 minutes at 45 cfh lol. Still, it sounds like it would be interesting just to try. Is there any good way of testing that your purge is adequate? When I displace oxygen while carbonating, I usually need to use a...

Nothing made for the purpose but I could seal off my sand blasting glove box and flood that with argon. Granted, it would be a ton of argon... I'm going to need to make a fixture either way. Something like this maybe: fixture.png So I'm thinking with a copper plate with a hole bored in it and lantha...

Yup lol
Clearly I need to swap over to my jumbo gas lens but that worked surprisingly well.

I've ordered some rhenium/tungsten wire so we'll see how that pans out.

-Sandow

Grientime, genetics and IT mostly but I do some high vacuum repairs too. Poland, that is a good idea. Turns out the .040" pure tungsten is ductile enough to cold bend at the angles I'd need (108 and 120). 1/16" snaps like a twig with hardly and deflection though and that is what I'd wanted...

I'd go up to a quarter at least. It can be hard to see exactly where a crack ends and holes are easy to fill.

-Sandow

Sooo-you want to whack off a hunk say a foot for $10? Sure why not. You can PM me with details. Make sure you wear a respirator when you cut or grind it though. Silica needles are not great for you. Cut it with a thin high speed diamond wheel like a dremel. Angle grinder blades will just chip it. I...

Looking good. Are the lower pictures stainless or chrome-moly? Are there distortion problems with the threaded tube section after welding?

-Sandow

There are piles of companies selling the ct520d under their brand and at least on amazon the reviews aren't bad. Lotos has a manual posted here:

http://www.uwelding.com/v/vspfiles/manu ... 0D-V.1.pdf

-Sandow

If you guys like that and are using the CK pyrex sleeve, you might like this too: http://www.amazon.com/Fused-Quartz-Tubing-Diameter-Length/dp/B00OZXPPU8/ref=sr_1_3?s=industrial&ie=UTF8&qid=1423788179&sr=1-3&keywords=14mm+Fused+Quartz+Tubing I've used this for about a year after havi...

Exactly what temps is the finished product going to see? Hot. fusor core.png For application, the reaction energetics are limited by the grids heat tolerance. The hotter it can get before it slags, the higher the forward voltages can be and the longer the reactor can be run before needing to be cyc...

Hot enough that thermal collapse is the primary failure mode even with tungsten wire as the material. There is no way to sink heat from the grid beyond radiative emission. If you picture this as more or less a lightbulb filament, that isn't too far off the mark.

-Sandow

I'm missing something. Doesn't the filler metal always melt? Inconel it tough stuff but it melts at around 2550F vs 4750 for Moly and 6150 for tungsten. There are other metals that are pretty close to tungsten but they are exotic. Pure moly wire was hard to find but what are the chances of finding R...

Coldman wrote:Phosgene has a cumulative effect on sterility. If that's not screwing you up I don't know what is...

That isn't what the msds or the toxicology books say. Where are you getting that from?

-Sandow

Inconel is too low in melting point but moly is an interesting suggestion. I've seen literature about tungsten/moly alloy welding. It was sintering plates together though. I imagine this would be tig braising rather than actually melting the base metal or is there a tungsten/moly alloy you had in mi...

For what it is worth, phosgene is transient in effects so if it doesn't kill you it doesn't really screw you up. Personally I like chlorine free brake cleaner prior to welding simply because you can push contaminants off the end of a part. I'll use acetone and MEK too but I really don't see a huge p...

So I'm trying to put a tungsten grid together for a high temperature hard vacuum application. I've tried welding pure tungsten electrodes with thin rod as fill and it sticks together just fine but it is extremely brittle. Even a few degrees of flex and the portion that has melted snaps away clean. T...