> My experiences have been there is limitations using epoxy resins and the
> theory behind the cure of epoxies leave areas of limitations of epoxies.
> One of these limitations is the availability of building small cavities
> and small holes. Knowing this theory, the height of the part is very much
> a factor in if the success of building small features and if they even
> appear. Also the longer the resin is in the cavity the more the viscosity
> will increase, making it impossible to clean out. I found the only resin
> which will do small cavities is acrylates. Unfortunately the SL-5149
> acrylate has been discontinued due to lack of sales of that product. Using
> the SL-5149 I was able to produce .010 inch cavities in a 1 inch block.
> The only other resin which I found even came close to producing small
> cavities is the RPC100Hc resin.
> Beth, I believe you are familiar with what I am explaining here. We've
> discussed this at previous conferences, so maybe this information will
> help somebody out there.
> TYCO / ELECTRONICS
> Communications Business Unit
> | Robert F. Zubrickie
> | Manufacturing Engineer II
> | 3101 Fulling Mill Road, MS 128-98
> | Middletown, Pa 17057
> | E-Mail: email@example.com
> | Phone - (717) 592-5208
> | Fax - (717) 592-4943
> -----Original Message-----
> From: Beth_P_Israelnaim@bd.com [SMTP:Beth_P_Israelnaim@bd.com]
> Sent: Wednesday, January 05, 2000 1:35 PM
> To: firstname.lastname@example.org
> Subject: Aspect ratios for holes in SLA
> Dear RPML Friends,
> I am currently building some small parts with small diameter holes and
> have run
> into somewhat of a problem cleaning the liquid resin out of these holes as
> length of these holes get longer. This problem has lead me to wonder two
> 1. How small of a hole are other users able to build on their SLA's and
> on that
> smallest diameter hole you can build, what is the length of the span that
> hole can travel and still be cleaned out. What SLA system are you using
> what resin are you building with?
> 2. Has any University or Consortium project evaluated the different
> systems and
> their resins/powers to see what aspect ratios can be achieved with the
> resins/powders and their viscosity's and or particle size?
> Thank you in advance for any information you can share. If there appears
> to be
> enough interest I will tabulate and share the results with the RPML.
> Beth Israelnaim
> RP Specialist
> BD Technologies
> P.O. Box 12016
> RTP, NC 27709
> For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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