Posted by Per Corell on August 31, 2002 at 01:15:19:In Reply to: Gargantuan milling machine posted by Robert Henderson on August 30, 2002 at 20:54:08:
Hi.
Realy #D milling mashines are very exiting mashines ,but not very effective ,very expensive , also in use, and please consider what the "raw material" cost. ------I can tell that It's huge expenses.
Besidt it's not a fast technology with very limitet porpus and beside the objects are fragile the technology are quite old.
Just like the instant prototyping that is just a smarter way to cut 2D slices these two technologies are still after 20 years top technology. Think about it ,only thing the results of these two technologies can be used for ,is to create a fragile shape with an expensive technology that even produce veak products in few numbers.
Now you ask if it will be possible to mill a full yacht ,but what's the use of that if even possibel you would need to produce molds and to do that ,your yacht shuld be broken up into several parts ,beside there will be no need for an intire boat lookalike no use at all but a mountain of expences. Also there are a few limitations like the roughness of the surface that you will not get smooth following generatet 3D lines with a cutting tool ,so there will be quite a lot of finish to do on a material filled with small holes .
Exiting technology, but not very effective ,very old, increadible expensive and very complicatet ; just the right new technology wouldn't you say ;))
Oh yes ,then there are the Rapis proto typing, that is just as slow but with much smaller objects ,where you can't reach around the object, but must rely that what is produced can be made with same technike, as if you cut the object in slices with a Laser or Water cutter in slices and glued them together ; untill they make a hollogram harden the plastic this technology is as limitet as any other that been said to be top technology since 89.
Maby the investments in 3D routers was made from expertations that it would be nice with a Yacht cut 3D in styrofoam or polyurethane foam, but the use for such increadible expensive models are very limitet and acturly they can only be used as full-scale models to tell what you can se from 3D CAD . The technologies are very demanding and limit the creativity in the next proceses heading towerds a final result and both technologies fit very badly with how the actural manufactoring process go from that. ------ But it's proberly nice in commersials .
If you want to router a scale model of a Yacht ,then you will be just as well off, having it cut in slices with a simple water or laser cutter. Callibration holes can then be placed within the cut sheet, so all slices will fit exactly around these holes, and the finishing the surfaces are decided by how thick you decide each slice to be.
------- Anyway you would need to sand down the surface anyway, then why not use a technike that is that much cheaper and uses standard 2D N.C. cutters.
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