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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