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Unread 29-04-2008, 22:53
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Re: Future use of cRIO?

Quote:
Originally Posted by RyanN View Post
I'm not sure what it was; I never heard anyone say what it was made of. I'm going off of weight, looks, and feel; however, I'm not a metal expert .

I'm also not sure what SLS is... I did a quick Wikipedia search, and found the most relevant thing was that it was used in toothpaste?!? Obviously not the same SLS.
Selective Laser Sintering. Pretty much you take a powder (metal can be used, but nylon is perhaps more common) and burn it with a laser in a particular pattern, namely whatever patter will get you your part. Add another layer of powder, repeat. Repeat until you get your part. Shake off the unused powder and clean the part up.
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Unread 29-04-2008, 23:04
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Re: Future use of cRIO?

Quote:
Originally Posted by EricH View Post
Selective Laser Sintering. Pretty much you take a powder (metal can be used, but nylon is perhaps more common) and burn it with a laser in a particular pattern, namely whatever patter will get you your part. Add another layer of powder, repeat. Repeat until you get your part. Shake off the unused powder and clean the part up.
Sounds pretty cool! I guess we'll find out once more information comes out, or perhaps it's already out, but I have a Research paper for English calling my name... so I cannot look right now.
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Unread 29-04-2008, 23:13
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Re: Future use of cRIO?

The white plastic parts were rapid prototyped via SLS. I am head over heels in love with the fact that in the time it takes the board house to build my boards, the ME can design AND GROW its enclosure. Thank you Altium, Thank you SLS, Thank you Simon.

I am unsure of exactly what the material we used is. Production models will be injection molded.

I will tip my hat to the NI folk, but I believe the cRIO is die-cast, possibly sand blasted, and then painted. I don't believe it is cast iron; I'm leaning towards aluminum.

As for U2, Greg is absolutely correct. It simply adds current drive strength to the DIO. The victors require a few milliamps to turn on. A standard hobby servo signal requires almost no drive strength, and could be run without the buffering stage.
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Unread 29-04-2008, 23:20
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Re: Future use of cRIO?

Die-cast aluminum sounds much more appropriate. I knew the side-car and other external modules were quickly made prototypes, so I wasn't counting on anything final with those. I believe I was thinking earlier die-cast, but forgot the term and just said cast iron, but I did believe it was steel, but I guess it would be heavier than it currently is.

Again I'm very excited about the new control system, and I actually installed LabView 8.0 on my laptop today from the 2005 KOP (or maybe 2006), and was able to get a few things working. I'm going to look at it more this summer when I have more spare time.
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Unread 30-04-2008, 00:28
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Re: Future use of cRIO?

If it is white and was made by SLS it was probably Nylon 12 or possibly Nylon 11. Most service bureaus run 12 because it is easier to work with and excess can be re-used to some extent. 11 is much cheaper but cannot be re-used. This leads to some interesting economic/environmental tradeoffs.

For this application it doesn't matter much. In fact, it is hard to tell the difference in mechanical properties between the two. Each is better in some corner of the envelope, but the differences are smaller than the uncertainty in my designs.

There are other whitish SLS materials that are used sometimes. There is a styrene used to make patterns for casting metal and a rubber-like material has come out in the last couple of years. But they are unlikely to be used for this application

I have been working with SLS since around 2000. First as a customer and later getting it qualified to use on aircraft. I still get a kick out of getting a part that is exactly what I designed out of the machine with no labor on my part. Just ship the .stl over to Boris, he loads the machine with the file and powder and punches the button. Two to three days later I have a part. You should see the "toybox" I have at work with all the neat little gizmos we put in the unused corners of the builds.



Quote:
Originally Posted by EricVanWyk View Post
The white plastic parts were rapid prototyped via SLS. I am head over heels in love with the fact that in the time it takes the board house to build my boards, the ME can design AND GROW its enclosure. Thank you Altium, Thank you SLS, Thank you Simon.

I am unsure of exactly what the material we used is. Production models will be injection molded.
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Unread 30-04-2008, 11:47
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Re: Future use of cRIO?

Quote:
Originally Posted by EricVanWyk View Post
The white plastic parts were rapid prototyped via SLS. I am head over heels in love with the fact that in the time it takes the board house to build my boards, the ME can design AND GROW its enclosure. Thank you Altium, Thank you SLS, Thank you Simon.

I am unsure of exactly what the material we used is. Production models will be injection molded.

I will tip my hat to the NI folk, but I believe the cRIO is die-cast, possibly sand blasted, and then painted. I don't believe it is cast iron; I'm leaning towards aluminum.

As for U2, Greg is absolutely correct. It simply adds current drive strength to the DIO. The victors require a few milliamps to turn on. A standard hobby servo signal requires almost no drive strength, and could be run without the buffering stage.
I believe you are referencing this post.
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Unread 30-04-2008, 08:58
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Re: Future use of cRIO?

Quote:
Originally Posted by EricH View Post
Selective Laser Sintering. Pretty much you take a powder (metal can be used, but nylon is perhaps more common) and burn it with a laser in a particular pattern, namely whatever patter will get you your part. Add another layer of powder, repeat. Repeat until you get your part. Shake off the unused powder and clean the part up.
To me...it doesn't make much sense to make 1000s of SLS parts when you can just have a mold made and get them injection molded. I believe the SLS was just a "prototype" cover. I could be compeltely wrong though.
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Unread 30-04-2008, 10:21
AustinSchuh AustinSchuh is offline
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Re: Future use of cRIO?

Quote:
Originally Posted by Brandon Holley View Post
To me...it doesn't make much sense to make 1000s of SLS parts when you can just have a mold made and get them injection molded. I believe the SLS was just a "prototype" cover. I could be compeltely wrong though.
I can't seem to find the correct post to quote, but I distinctly remember someone from NI saying that the SLS cover was just a prototype and the real ones would be injection molded plastic.
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