Re: Z-measurement

From: David Retallick (dr@retallick.de)
Date: Thu Sep 10 1998 - 23:31:24 EEST


Sorry folks,

I wrote to Wilf, forgot to "cc" the list. So here it is again.
This problem may be of general interest for all lamination machines,
including Helisys, so I took the liberty of re-introducing my reply to
Wilf to the list in general.

 
> w.Backers@ind.tno.nl wrote:
> >
> > I have some problems with the tolerances of the KIRA machine. In the
> > z-direction, the model will grow after the production of it. Maybe it
> > has something to do with the humidity of the air or the temperature of
> > the environment. Is there anybody who knows a good way of testing the
> > tolerances of the model and solving the problems with the tolerances in
> > the z-direction? Maybe somebody knows a good stl-file for testing
> > tolerances.
> > Just let me know
> > Gomaar
> >
> > For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/

I wrote:
>
> Hi Wilfried and list,
>
> yes, obviously the initial paper/air humidity plays a role. Normally,
> one waits until the model has grown in the z-direction, become stable,
> and then the part is sealed with a laquer or epoxy resin.
> Your problem, Wilf, as I understand it, is that at TNO the paper is
> DRYED beforehand. This of course causes an abnormal growth after the
> part is finished, beause the moisture in the air is absorbed, causing
> the dreaded "z-growth".
> I have done a number of tests using "wet paper" (the walls of the
> showrooms became damp due to a blockage in the drainage system).
>
> The results:
>
> - The bonding was just as good
> - The z-growth was minimal!
>
> My suggestion: work with damp paper, use European coated paper, you
> could even use the new toner system from Kira, and I think your > problems would be not worth mentioning.
>
> We are conducting tests on the new toner next week in Gladbach at
> "ZAP-Ludwig GmbH" and I will report the results.
>
> --
> Dr. David Retallick, KIRA Agent
> Retallick Systems, Baumgaertle 36,
> D-86505 Muensterhausen (Germany)
> phone +49/8281-1763 - fax +49/8281-5556
> http://www.retallick.de

For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/



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