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"Darrell Urbien" <durbien@mail.occ.cccd.edu> wrote in message
news:I2DzA0.120q@lugnet.com...
> Hey all,
>
> Just got my pix back from the Rapid Prototyping conference and thought I'd
> share..
>
>
<<http://www.brickshelf.com/gallery/durbien/Rapid-Prototypes/Model-Peugeot-3
06/1-side.jpg>>
>
> <http://www.brickshelf.com/cgi-bin/gallery.cgi?f=94617 Folder Pending Mod>
>
>
> Full credit has to go to:
>
> [Tom Burger] (for designing the parts in the first place and making the • DAT
> files freely available)
>
> [Greg Overkamp] (for designing the original MOCs - though I must admit I • had to
> do some creative substitution to make up for my small parts collection)
>
> The great folks at the [RP Technologies] conference for making the parts, • and of
> course..
>
> The staff and students of [Orange Coast College and DRAFT 159], who put up • with
> all my LEGO foolishness!
>
>
> The DAT files had to be tweaked a little - some of the part features were
> un-buildable. For example, there was no way to make the impossibly thin • low
> profile tyre part and expect it to survive, so we just made it part of the
> wheel.
>
> The machines I used were a 3DSystems InVision (this uses a photopolymer • resin
> build material, encased in a wax support) and a Stratasys Dimension (ABS • build,
> water-soluable support). I didn't use a ZCorp machine even though one was
> available at the conference. The consensus of the Techs was it wouldn't be • able
> to hold the fine detail in the wheels, etc.
>
> It was great fun to make these parts, and I learned a lot!
>
> 1- The conversion factor of 1 LDU = .4mm isn't exactly applicable to RP • LEGO.
> Some of my parts are loose, some are tight. We built in a little fudge • factor in
> the STL files, but obviously it wasn't enough for some machines/part • features
> and too much for others. I knew LDraw was extremely simplified compared to • real
> LEGO, but nothing like experiencing it!
>
> I only got to make a few parts on each machine. There were lots of people • at the
> conference, so I didn't have time to tweak dimensions and run more.. I • could
> probably get much better fits the second batch.
>
> 2- The 3DSystems machine could hold extremely fine detail - the spokes on • part
> 46000 are tiny! I even modeled a little groove on the front face of that • part,
> trying to represent the joint between the wheel and the tyre. It's • fractions of
> a mm in the CAD file, but it showed up nicely in the raw part. Of course
> painting to that groove was a challenge - one that I didn't take up, LOL..
>
> 3- Don't leave your photopolymer parts in the support cleaning bath for • more
> than a few seconds at a time - they'll melt! When I found out some of my • parts
> were heat damaged, I was really bummed. The parts as they came out of the
> machine looked great. One in particular, a wing (part 42461), looked • fantastic -
> until we broke it trying to get the wax supports off. It was repaired and • broken
> several more times before I even got a chance to photograph it, but I • managed to
> cobble it back together with superglue. Of course the wing angle got • screwed up
> in the process, but what are you gonna do? I broke one of the wheels • trying to
> get it onto an axle too..Grrr.
>
> 4-The Stratasys Dimension rocks! The ABS is very durable and LEGO-like. • I'd
> really like to try some of the wheels in that machine. The machine we have • at
> OCC uses solid "breakaway" support material - in other words you have to • get in
> there with tools and chip your part out of it. Not fun. The Dimension • cleans up
> in a little whirlpool bath. Much nicer.
>
> 5- I didn't really have time to finish the parts properly - you can still • see a
> lot of "step-over" (the edges of the layers of material are apparent). • That
> could've easily been sanded smooth. I didn't do any sanding or finishing • on the
> bodykit parts at all, though actually I think they look more realistic in • white!
>
> I did decide to paint the broken wing since it was so hideously ugly from • the
> repairs. I painted the wheels just because they looked funny in • translucent
> resin, but they probably deserved to be sanded and clearcoated.. In the • pic in
> the folder that shows the four wheels you see: two painted very basically • (front
> and rear views), the broken one (subsequently painted black), and a • completely
> raw part.
>
>
> Hope you enjoy the parts and mocs - I know my students will really get a • kick
> out of them. I brought the parts to SIGGRAPH and they seemed to go over • well,
> though Tim Courtney trumped me with about 30 beautiful Stratasys and ZCorp • parts
> on display... Punk! :)
>
> I wish I could go to BrickFest, but I'm seriously conferenced-out. Plus • school
> is starting up soon! I might be able to make NWBrick Con - I should have • more
> stuff printed by then too.
>
> PLMKWYT
>
> Darrell
I'm in! Put me on your list of people who definitely WANT SOME OF THOSE
PARTS
!
-Rob
www.brickmodder.net
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Message has 2 Replies:
 | | Rollin' on '20s
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| (...) Hey Rob, evidently LEGO was listening to you (and watching MB Nano car kits flying off the shelves) because the latest micro-ish Racers kits (esp. 8643 and 8644) have very nice large diameter aluminium rims and low profile tires. The kits (...) (20 years ago, 21-Dec-04, to lugnet.parts.custom, FTX)
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Message is in Reply To:
| | My Big Phat RP Parts
|
| Hey all, Just got my pix back from the Rapid Prototyping conference and thought I'd share.. (2 URLs) Folder Pending Mod> Full credit has to go to: Tom Burger (for designing the parts in the first place and making the DAT files freely available) Greg (...) (20 years ago, 13-Aug-04, to lugnet.cad, lugnet.parts.custom, FTX) !
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