RE: Some reliable equations for RT

From: mepstein (mepstein@temple.edu)
Date: Wed Feb 06 2002 - 04:12:00 EET


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
>
>
>
>
>
>
>_________________________________________________________________
>Join the world's largest e-mail service with MSN Hotmail.
>http://www.hotmail.com
>
>
>For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
>
>For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
>
>
>For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
>
>
>For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
>
>
>For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/
>.

For more information about the rp-ml, see http://rapid.lpt.fi/rp-ml/



This archive was generated by hypermail 2.1.4 : Tue Jan 21 2003 - 20:13:26 EET