Dear Dan,
Okay, but it would be interesting to know what are the tolerances that
you guys who are actually using the various machines are accustomed to
getting from them? Some people say that an important reason for choosing an
SLA today is that the machine is mature and gives good accuracy. How good?
And can it be as good as Sanders?
Marshall
DANIEL CHARLES DAVIS wrote:
> Marshall,
>
> That's what I get for answering before my morning coffee. Two
> thousands......twenty thousandths.......what's a few thou between
> friends. Sorry for any confusion caused by my brain failure.
>
> This thread is timely for me as I was just going over tolerances here
> for some plastic parts. I'm sure you realize that in the auto industry,
> especially Asia, our tooling is held to 0.1-0.2mm (or even looser) for
> 90+% of what we make. That leads me to wonder: how many consumer
> product industries REALLY need to hold accuracy to 0.05mm overall? Of
> course that can get us into a whole debate regarding engineering
> practices ala Taguchi methods and "robustness." This is the wrong forum
> for that although I would be happy to discuss in private.
>
> Regards,
> Dan Davis
> Head, RP&M Division
> PROTON Berhad
> Hicom Industrial Estate
> Batu Tiga, PO Box 7100
> Shah Alam, 40918 Selangor MALAYSIA
> +60 3 515-2380
>
> > ----------
> > From: Marshall Burns[SMTP:marshall@ennex.com]
> > Sent: Friday, June 05, 1998 10:36 AM
> > To: DANIEL CHARLES DAVIS
> > Cc: 'James Theoharris'; 'RP-ML'
> > Subject: Re: Too many SB's & a little late
> >
> > Dan,
> >
> > Would you please clarify? You seem at first to be implying that
> > machines
> > other than the Sanders can hold 0.002 inch tolerance. But then your
> > data
> > talks about holding 0.010 to 0.014 inch. Accuracy has always been a
> > complex
> > issue. What point are you actually making here?
> >
> > Marshall Burns
> >
> >
> >
> > DANIEL CHARLES DAVIS wrote:
> >
> > > Hmmmm, two thousandths of an inch. Are you saying that all RP
> > equipment
> > > except Sanders is only accurate to that or is this only the Actua?
> > >
> > > Of course the Actua (and Z-Corp and other concept modelers) will not
> > > hold tooling tolerances. If we are talking about SLA & LOM, we
> > > consistantly hold 0.25-0.35mm (0.010-0.014 inch) tolerance evben on
> > full
> > > envelope parts. I have many CMM printouts to support that. Maybe
> > the
> > > folks in question just don't know how to dial in their machines?
> >
> >
> >
> > --
> > Marshall Burns
> > Marshall@Ennex.com
> >
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> >
> >
>
> For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
-- Marshall Burns Marshall@Ennex.com***************************************************************** ***** ENNEX(TM) CORPORATION ***** Fabbing the Future(TM) ***************************************************************** ***** 10911 Weyburn Avenue, Suite 332, Los Angeles, U.S.A. 90024 ***** Phone: +1 (310) 824-8700. Fax: +1 (310) 824-5185 ***** E-mail: Fabbers@Ennex.com. Web site: http://www.Ennex.com *****************************************************************
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
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