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vacuum compatible plastic [message #93711] Thu, 10 July 2014 15:03 UTC Go to next message
avatar 09004103  is currently offline 09004103
Messages: 1
Registered: July 2014
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Junior Member
hi,
is it possible to print a non porous hard durable plastic that would work in a vacuum i.e. be vacuum compatible and not cause any leaks? I,m looking for to print a plastic ring to work in a transmission electron microscope. are printed metals also porous aswell or could they be use in the vacuum aswell for other component.



thanks, john
Re: vacuum compatible plastic [message #93806 is a reply to message #93711 ] Sat, 12 July 2014 16:11 UTC Go to previous messageGo to next message
avatar EdChamberlain  is currently offline EdChamberlain
Messages: 7
Registered: December 2012
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Junior Member
I'm not sure of the function of the ring you are after but 3D printing is highly inaccurate and therefore may not be suited to use in such a precise piece of equipment.

The plastics come with a rough surface, I can't say from experience weather they would be airtight though. I dont see any reason they wouldn't but it would defiantly need testing.

The metals come with rough surfaces too but you can have them plated in other metals and polished to give a smooth finish. A good example is Steel plated with polished Nickel. If this suits your application better this may be the best approach 3D printing can offer.

I would however suggest, if you're looking at creating a simple ring, that a turning or milling process may be much more accurate and effective (not to mention quicker). These processes can mill both plastics and metals to a much higher accuracy than 3D printing. A simple google search should bring up companies in your area.

Ed.

[Updated on: Sat, 12 July 2014 16:12 UTC]

Re: vacuum compatible plastic [message #94520 is a reply to message #93711 ] Tue, 22 July 2014 12:43 UTC Go to previous messageGo to next message
avatar Youknowwho4eva  is currently offline Youknowwho4eva
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Registered: September 2008
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Shapie Expert
I work here
Definitely wouldn't say 3D printing is highly inaccurate?

Our WSF and dyed variants, are very porous.
Detail plastic could work
FUD or FD could work better, plus highly accurate

Our stainless could be porous, even the coated and polished versions.

Our cast metals are solid. So you could order in brass or bronze, make you model a little big. If you order in raw, you can polish it to spec. Or if you order in polished, you still want it a little big, as our polishing will make it slightly smaller than drawn.

All that said, we state our products are for decorative purposes only! So I can not guarantee or suggest using an item outside of decorative purposes


I learned a long time ago the wisest thing I can do is be on my own side, be an advocate for myself and others like me. -Maya Angelou
michael@shapeways.com Community Advocate
Re: vacuum compatible plastic [message #95882 is a reply to message #94520 ] Mon, 11 August 2014 20:53 UTC Go to previous message
avatar EdChamberlain  is currently offline EdChamberlain
Messages: 7
Registered: December 2012
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Junior Member
In my experience 3D printing has always been inaccurate especially when compared to a microscope using a fine beam of electrons to image objects that are 30 nanometers in size.

What resolution do the shapeways printers print at? I believed it to be somewhere in the 20 - 80 micron range, which to me is rather inaccurate compared to a milling machine that can achieve accuracy of better than 0.3 microns.

I guess it depends on the application of the part that the op is after.

 
   
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