Hi Doug,
Thanks for your quick response.
Here at De Montfort we are utilising Direct AIM to produce very big parts
(one of the experimental parts that we have worked with is 160990 mm3)
where shrinkage is a great factor.
Being able to predict the shrinkage is of great importance to the parts we
make. An example of this is for an impeller (17661 mm3, for a motorcycle
engine) we have produced for flow analysis testing where accuracy is
critical.
The next part we will be making for functional testing is the top of an air
intake manifold, which is very large (285643 mm3).
I have already conducted some work which shows the post moulding shrinkage
to greatly differ between parts produced from stereolithography and
aluminium tooling.
Using Direct AIM allows us to produce plastic parts by their intended
production process and utilising the intended material, but without being
able to predict the shrinkage we cannot achieve the accuracy required.
Thanks again,
Regards Russ
Russ Harris
Research Fellow
Rapid Manufacturing Group
De Montfort University
Leicester, UK
Tel. +44(0)116 2551551 ext.6649
Fax. +44(0)116 2577052
----------
From: Groh, Doug[SMTP:GrohD@3DSystems.Com]
Sent: 22 November 1999 18:19
To: 'rharris@dmu.ac.uk'
Subject: RE: Shrinkage in parts from DirectAIM
<<File: ATT00000.html>>
I have done many DAIM tools (injection molding tools using STL models for
the tool) but as of this time am not aware of any studies done showing any
comparisons. most of the applications are so small and used for stricly
prototype applications, that I can't think of any reason to do this.
Doug Groh
3D Systems Inc.
Tooling Consultant
27280 Haggerty Rd.
Farmington Hills, MI
48331
248-489-0200 x228 office
248-489-0287 fax
grohd@3dsystems.com
dgroh@provide.net home
-----Original Message-----
From: Russ Harris [mailto:rharris@dmu.ac.uk]
Sent: Monday, November 22, 1999 10:26 AM
To: 'rp-ml@ltk.hut.fi'
Subject: Shrinkage in parts from DirectAIM
Hi All,
Does anyone have any information concerning the shrinkage incurred in parts
produced by stereolithography injection moulding or even a direct
comparison of the shrinkage of parts produced from stereolithography and
metal tooling?
Thanks,
Regards Russ
Russ Harris
Research Fellow
Rapid Manufacturing Group
De Montfort University
Leicester, UK
Tel. +44(0)116 2551551 ext.6649
Fax. +44(0)116 2577052
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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