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924aussie
Joined: 02 Feb 2006
Posts: 1009
Location: Chinchilla Queensland Australia
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 Posted: Thu Aug 25, 2011 10:52 pm Post subject: O/T CNC applications full size question |
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Does anyone have any background in 3D CNC applications ?
Instead of using a fibreglass mold the University I am working with wants to create the molds using CNC technology and has the files in .....
the SketchUp model Tub_1.skp. The original CAD model, containing the body and tub chassis, is available as a UniGraphics model or as a DXF conversion. "
this is what we are creating as a kit for builders, just need to give it a 924 shape now 
http://teamtrev.com/
Help design and build more Trevs at Trevipedia.
http://www.trevipedia.net/index.php?title=Main_Page
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green 924 .. 1980 rego 924PSH
1998 Mopar Neon ... sick
2003 Challenger / Montery 4WD
1995 Hyundai Scoupe ... sold
1998 Nissan Silvia ... sons back from OS he has taken it
BIG BLOODY MOTORHOME 300zx Sold
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MikeJinCO
Joined: 08 Jun 2010
Posts: 1245
Location: Maysville, Colorado
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| Posted: Sat Aug 27, 2011 11:37 pm Post subject: |
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I'm not a true expert, I have a small CNC router and use sign type software rather than solids modeling and machining. Your post sort of implies that they want to make metal molds which get extremely expensive due to the machining time, amount of raw material required etc. Think about even moving an aluminum mold for a fender, it would be several hundred lbs. It also currently costs over $4 to $5 per lb. That is why most limited production large molds are made with composites.
The .dxf file format was started by Autocad(Ithink) in the '80s for their 2d drawings and is not nearly as accurate for 3d work as some of the other formats. One of many is the .stl format. All of the CAM modeling programs have native formats and can work with each others fairly easily. According to the Unigraphics web site they also have a CAM system so your Uni file should be able to be converted in Unigraphics to a good compatible file.
It sounds to me like the education side might be pushing the project out of the realm of practicality, but they also have some type of cnc foam cutter to make an extremely accurate plug for a composite mold.
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Mike
'67 MG Midget Dp
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