Thinktank Revision 2.0

[3.0charlie]

Oh my... it's bigger and badder that I ever thought. And so out of my league.

[BrainEater]

Hahaah.

It's damn near outta my league too mang , and I have 20 years of fabrication experience.I said before , aerospace grade is harsh.That's basically what -80 c to -100 c entails.....

It might completely fail , but I will 'just giver'.

[3.0charlie]

LOL You ain't playing with MEK or Skydroil yet...

[LCB001]

They say the line between genius and insanity is a very thin one. You sir, seem to be riding that thin line. I can't wait to see the outcome of your..mmm.. experiment... Good Luck.

[BrainEater]

Hehe .

The only time I have mental instability is when I'm in stupid Calgary traffic.

Thanks , a little luck won't hurt.

---------

I have solved my pump problem !!! (mebbie)

This has been a rather major hurdle.I've spec'd out pumps of every type and design.I've had people laugh when I told em the required operating specs.The cryogenic pumps I have seen are many thousands of dollars.

So when in doubt , build it.

To this end , today I found and purchased just what I needed :

A 67 mm (2 5/8") 3-blade brass RC racing boat prop ;



----

I'll be putting this prop inside a 3" copper tube like so :



-----

You can pretty much figger out where this goes......I'll be attaching the prop to a variable speed belt system and a 1/3 HP motor....I need to fabricate shaft bearings , and output barbs onto the copper tube but thats no big deal.....

Considering what the final product will be made from , I see no reason this pump won't operate at -200C let alone the -100c I want.

[Eldonko]

How are you going to secure that rod? Should work I think..

[BrainEater]

Basically , The idea is to have the bottom of the pump as open as possible while having the required structure to support a bearing mount.The top will have another bearing mount , and 2x 3/4" output barbs.I don't need to worry about seals really either.....it's submersed when operating.....and waaaaaay overpowered ..

[nikitos]

Is it actually going to be belt drive? Are there (rubber, I assume that is what you meant) belts that can operate at such low temperatures?

[3.0charlie]

Rubber belts and isopropanol are compatible? What about the shaft bearings? They won't like being driven at -100C. You'll need some lubricant. Or is the isopropanol considered a lubricant?

[BrainEater]

Ah no....

The pump shaft will be coming out of the top of the dewar.The belt assy/motor are completely external.

I have yet to decide on bearings.