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properties of metal printing [message #5700] Thu, 06 August 2009 04:40 UTC Go to next message
avatar cstratton  is currently offline cstratton
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Are you able to provide the strength and fatigue characteristics of the objects printed in metal 3D printing? Do they compare to, say, cast iron? Or is it more like the strength of zinc?
icon5.gif  Re: properties of metal printing [message #5745 is a reply to message #5700 ] Sun, 09 August 2009 02:46 UTC Go to previous messageGo to next message
avatar joekneale  is currently offline joekneale
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I'd really like some information on this as well. I am considering using this process to rapid prototype some trigger-group components for a firearm, but am worried about the stress and temperature, It would be nice to have even "proxy" data to know what the characteristics of printed material are roughly similar to!
Re: properties of metal printing [message #5749 is a reply to message #5700 ] Sun, 09 August 2009 16:03 UTC Go to previous messageGo to next message
avatar GlenG  is currently offline GlenG
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I have been working with the exact same composite materials offered by SW's. I do not have the exact strength and fatigue numbers on hand but I can tell you what I have learned while handling, machining, finishing and coloring this metallic witches brew.
It is a true composite, composed of S.S. alloy 420 and a tin bronze infiltrant (not sure of the CDA#)

It is somewhat brittle, but has a better tensile strength than grey cast iron. Kind of like malleable cast iron. Thin sections will yield a little bit before fracture. This material is nothing like forged/ rolled material.

It is quite abrasive and rather difficult to machine. Carbide tooling is really a must.

It has poor heat conductivity. But this is a plus if it needs to be soldered or welded.
Silver bearing hard solders flow well and penetrate to fill small voids. I use "Black" paste flux. It can also be welded via TIG. I've not done strength tests and would only use these method for cosmetic repairs or dovetailed joints.

I have seen prototype turbine rotors used in real test scenarios. But gun parts? Maybe for lever type applications? Probably a bad choice material for sliding surfaces or any part subjected to high impact or sudden pressure.

Hope some of this helps. I'll dig up some test specs to post soon.

-G


"Where the spirit does not work with the hand, there is no art."
Leonardo da Vinci
Re: properties of metal printing [message #5806 is a reply to message #5749 ] Wed, 12 August 2009 17:13 UTC Go to previous messageGo to next message
avatar cstratton  is currently offline cstratton
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thanks, that's helpful information.
Re: properties of metal printing [message #5832 is a reply to message #5749 ] Thu, 13 August 2009 11:36 UTC Go to previous messageGo to next message
avatar Tommy_2Tall  is currently offline Tommy_2Tall
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I read somewhere (can't find the post) that SS alloys will produce some posionous gas when they get too hot..

Do you (or anyone else) happen to know at what temperatures that would start to happen?

Would it be safe to make a candle/tealight holder out of the SS-alloy that Shapeways is offering.. or possibly use it as a "heatsink" for electronics that don't get very hot?
(The component I'm thinking about fails internally at 60-70 Celcius so anything above that would be an "epic fail").

I know GlenG wrote about poor heatconductivity but it would probably better to try it out with an SS-object rather than dangling in thin air in an enclosed space.. right?

Hmm.. someone was on the same track and got a reply that I had missed:
http://www.shapeways.com/forum/index.php?t=msg&th=1139&a mp;start=0&S=cf780c85ba1f886bffc4f159c9a59227
No word about gases there though.. did I get it wrong?

[Updated on: Thu, 13 August 2009 11:43 UTC]

Re: properties of metal printing [message #5837 is a reply to message #5832 ] Thu, 13 August 2009 13:07 UTC Go to previous messageGo to next message
avatar GlenG  is currently offline GlenG
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There is a potential hazard in all stainless steel alloys due to the Chromium content. If you Google "Hexelevant Chromium" you can learn more. This is only a real danger if you vaporize the metal, as in melting or welding. Breathing large amounts of metal dust could also be a hazard but only in industrial scale exposures. For your purposes or just about any SW user there is no hazard. Hey , even water can kill you if you drink too much at one time!

As to using this material for a "heat sink", it would be about as useful as "teats on a boar". Aluminum is the way to go. If you can't find an off the shelf part that fits then you could have it CNC machined to order.

Hope this helps.

-G


"Where the spirit does not work with the hand, there is no art."
Leonardo da Vinci
icon14.gif  Re: properties of metal printing [message #5839 is a reply to message #5837 ] Thu, 13 August 2009 13:43 UTC Go to previous messageGo to next message
avatar Tommy_2Tall  is currently offline Tommy_2Tall
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Thanks for the info! Very Happy

That project of mine feels 100% feasible now..
All I have to do is model the heatsink as a separate removable part and send that drawing/model to the local CNC-shop.. wherever that is.. Confused
Re: properties of metal printing [message #5850 is a reply to message #5839 ] Thu, 13 August 2009 18:36 UTC Go to previous messageGo to next message
avatar GlenG  is currently offline GlenG
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I will have to find the name and url but there is a US company that does short run stuff very inexpensively. You use their software to design the part and you get an instant quote. I'll have to hunt for the link but i will post it. I'm out of town for the weekend but should be able to post it early next week


"Where the spirit does not work with the hand, there is no art."
Leonardo da Vinci
Re: properties of metal printing [message #5851 is a reply to message #5850 ] Thu, 13 August 2009 18:58 UTC Go to previous messageGo to next message
avatar GlenG  is currently offline GlenG
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Tommy,
The shop I mentioned is: <www.emachineshop.com> . Good work, fast and cheap.
-G


"Where the spirit does not work with the hand, there is no art."
Leonardo da Vinci
Re: properties of metal printing [message #5861 is a reply to message #5851 ] Fri, 14 August 2009 07:52 UTC Go to previous messageGo to next message
avatar Tommy_2Tall  is currently offline Tommy_2Tall
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Once a gain, thanks for the help Very Happy

I'll definitely check out their services but I'm guessing that the delivery costs will make it less appealing to me (living in Sweden) Smile
Re: properties of metal printing [message #5862 is a reply to message #5837 ] Fri, 14 August 2009 08:39 UTC Go to previous message
avatar joris  is currently offline joris
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Guys please be really careful with post processing these materials.

You can find some material characteristics such as hardness and strength here:
http://www.shapeways.com/blog/archives/273-Stainless-Steel-f or-all.html

 
   
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