From: thoms1991 (thoms1991@hotmail.com)
Date: Wed Feb 06 2002 - 19:27:41 EET
Yes, Molly, unfortunately there is a dichotomy between theoretical scholarly
arts and engineering pursuits and hands-on mechanical arts and engineering
pursuits. Since you're now in the scholarly arena, you will have to seize
every opportunity to acquire the hands-on skills and use your own
imagination to drag the art and technology forward. I believe you're on the
right track!
----- Original Message -----
From: "mepstein" <mepstein@temple.edu>
To: "Lamar Davidge" <lamar.davidge@airmail.net>; <rp-ml@rapid.lpt.fi>
Sent: Tuesday, February 05, 2002 9:12 PM
Subject: RE: Some reliable equations for RT
> Hello,
> I am new to this list and I wanted to introduce myself. My name is Molly
> Epstein, I am art student and am very interested in rapid prototyping
> processes. I don't know if this list gets philosophical or if it just
> technical, but it seems pretty informal and welcoming. This post from
Lamar
> Davidge made me think of a lot of things that I believe to be a really big
> problem in my experience with people. My school is the only college that
I
> know and it is what I am responding to, so bare with me but I really feel
that
> the next generation of students coming out of great art schools really do
not
> know the fundamental requirements of making things work well, and using
tools
> and machines correctly, not just making mistakes but really not
understanding
> the way things work. It seems that we are rushed and pushed away from
> learning how things work, or how to do something with the best
craftsmanship
> and quality. How do any of you feel about this? Have any of you seen a
> digression in quality and craftsmanship throughout your time doing what
you
> are doing?
> -Molly
>
>
>
> Will,
> >
> > You forgot to mention that tool life is also affected by the ability
of
> >the employees who are responsible for running the tool. I have seen some
> >very simple tools ruined on the first shot due to mistakes, a 150 ton
press
> >closing on an aluminum or epoxy tool can wreak havoc, not to mention what
> >injecting at 2500psi, instead of 350 psi, can do to a fragile tool. Also
> >epoxy is very strong, but if you drop it on the floor with the core side
> >down it wont last long. The best constructed tool, with the best possible
> >design, wont last long if you dont have people who are skilled running
it.
> >
> >Lamar Davidge
> >-------Original Message-------
> >
> >From: Pattison, Will
> >Date: Friday, February 01, 2002 06:35:11 PM
> >To: rp-ml@rapid.lpt.fi
> >Subject: RE: Some reliable equations for RT
> >
> >in my experience, the only equation that can be used to determine shot
life
> >in a rapid tool is something like:
> >
> >tool life is inversely proportional to part complexity, inversely
> >proportional to how many parts you need, inversely proportional to how
much
> >your customer is willing to spend, inversely proportional to how fast
they
> >need parts, directly correlated to the material they want, and directly
> >proportional to the real toolmaking knowledge that goes into design of
the
> >rapid tool.
> >
> >i'd be curious to see any mathematical model that effectively takes all
that
> >into account.
> >
> >will pattison, skeptic
> >product development
> >ignition
> >plano, texas
> >www.ignitioninc.com
> >
> >-----Original Message-----
> >From: Chang-Shik Min [mailto:mcs9413@hotmail.com]
> >Sent: Friday, February 01, 2002 9:23 AM
> >To: rp-ml@rapid.lpt.fi
> >Subject: Some reliable equations for RT
> >
> >
> >
> >Dear Rapid Tooling specialists:
> >
> >Hello...how are you today ? I have survived this field of RT research
since
> >1994.
> >Based on statistics,probability and stochastics,I have been trying my
best
> >to simplify all the RT business processes,especially for quoting and
process
> >
> >control.
> >Meanwhile,I have recently come up with some highly reliable empirical
> >equations for tool (which is made by RT methods)life estimation,part cost
> >estimation for low-mid volume production from RT molds.
> >Is there any one who has ever tried to make some empirical equations for
RT
> >?
> >Any comment you could give me would be greatly appreciated.
> >TIA
> >
> >
> >
> >
> >
> >
> >_________________________________________________________________
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> >
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> >
> >
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> >
> >
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> >
> >
> >For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
> >.
>
>
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>
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