From: Paul Suomala (psuomala@sandersdesign.com)
Date: Wed Jul 20 2005 - 23:00:46 EEST
Steve Stewart wrote:
>Prof. Bernard,
>
>While you are technically correct, following the procedure you recommend
>will often lead to unnecessarily large .stl files. Since most additive
>fabrication machines aren't capable of a resolution better than about .025
>mm (.001"), we always recommend using that as a chord height. A smaller
>chord height does nothing to improve the final part, and often creates
>needless bottlenecks in file transfer, orientation, and slicing.
>
>Best regards,
>
>Steve Stewart
>Protogenic, Inc.
>
>-----Original Message-----
>From: Alain BERNARD [mailto:Alain.Bernard@irccyn.ec-nantes.fr]
>Sent: Tuesday, July 19, 2005 4:31 PM
>To: Warner, Pat
>Cc: rp-ml@rapid.lpt.fi
>Subject: RE: [rp-ml] Pro-E STL parameters
>
>
>Dera Pat,
>
>someyears ago, I used to use Pro-E very often and I identified the
>following scenario:
>
>you enter a very very small value, then Pro-E replies: "the minimum value
>is... " and then you enter the proposed value + 1 micron and you obtain the
>best possible STL file. Sometimes, it remains problems with the solid
>characters (when you want to write a word on the part, for exemple a
>reference).
>
>This is my experience.
>
>I hope this will help.
>
>Best Regards,
>
>Prof. A. BERNARD
>
>A 19:32 19/07/2005 +0100, vous avez écrit :
>
>
>
>>Many thanks to all that responded. As always, extremely helpful.
>>
>>
>>
>>Regards
>>
>>
>>
>>Pat
>>
>>
>>
>>----------
>>From: owner-rp-ml@rapid.lpt.fi [mailto:owner-rp-ml@rapid.lpt.fi] On
>>Behalf
>>Of Warner, Pat
>>Sent: 19 July 2005 11:28
>>To: rp-ml@rapid.lpt.fi
>>Subject: [rp-ml] Pro-E STL parameters
>>
>>
>>
>>Hi List
>>
>>
>>
>>Could anyone please give me parameters for Pro-E stl file creation?
>>
>>
>>
>>Regards
>>
>>
>>
>>Pat Warner
>>
>>Digital Manufacturing Supervisor
>>
>>Renault F1 Team
>>
>>Enstone
>>
>>Oxon
>>
>>OX7 4EE
>>
>>
>>
>>Tel +44 (0) 1608 678000 ext 5152
>>
>>Mobile +44 (0) 7879848060
>>
>>Fax +44 (0) 1608 678514
>>
>>
>>
>>
>>
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>
>____________________________________________________________
>Alain BERNARD
>Professeur des Universités
>Responsable du projet Ingénierie Virtuelle pour le Génie Industriel à
>l'IRCCyN UMR CNRS 6597
>(Institut de Recherche en Communications et Cybernétique de Nantes)
>Directeur du Département Ingénierie des Produits et Systèmes Industriels de
>l'Ecole Centrale de Nantes
>1, rue de la Noë BP 92101 F - 44321 - NANTES Cedex 03 (France)
>tel IRCCyN : + 33 (0)2 40 37 69 53 (secr.) ou 69 66 (direct) fax : + 33
>(0)2 40 37 69 30
>tel IPSI : + 33 (0)2 40 37 25 11 (secr.) ou 69 53 (direct) fax : +
>33 (0)2 40 37 25 36
>____________________________________________________________
>
>
>
>
>
I share your viewpoint. I would also add that, somewhere in the past, I
encountered a particular geometry that actually created a problem in the
fabrication of the part itself on a "Sanders" machine.
The part was a turbine blade (trailing-edge radius approximately .01
inches). The chordal deviation had been set at .0005 inches and caused
the STL file to "crinkle" in the trailing edge area. This in turn caused
the pre-processing software to become confused as to where supporting
matreial should be deposited.
The part could not be successfully built with that tecnology until the
chordal deviation was changed to a larger number.
Paul S
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