RE: A suggestion on how to solve shipping nightmare

From: Richard M. Harrington (
Date: Thu Oct 09 2003 - 23:21:32 EEST

Hi list,

We resolved this problem by developing a foam to shoot the parts out of
that eliminates the need for wax, eliminates autoclave, has no variable
shrinkage and ships well (no special packaging)

Rick Harrington
Harrington Product Development Center
"Your partner in product development solutions"
1756 Tennessee Ave
Cincinnati, Ohio 45229-1202
Phone: 513.482.4702
Fax: 513.482.4709
Web Address:

-----Original Message-----
From: [] On
Behalf Of Bathsheba Grossman
Sent: Thursday, October 09, 2003 1:33 PM
Subject: Re: A suggestion on how to solve shipping nightmare

On Thu, 9 Oct 2003, Blasch, Larry wrote:
> If you pack the part in fine sand (or clay, talc, or plaster) and
> vibrate it to compact it around the part, it will produce a fine nest
> to hold the part. The problem is with the material shifting and the
> part being put under stress.
> If you pack the sand around the part in a bag, and vacuum seal it, you

> will end up with a stable brick of sand that is relatively immune to
> damage.

I found this method to works OK as regards breakage, although with parts
for casting it's necessary to use a burnable packing medium. I've used
cornstarch and flour with Solidscape parts. The trouble was that
afterwards the stuff had to be cleaned off the parts, which is an
annoying and risky chore that most customers prefer to avoid.

Also the recipient has to remove the parts from the powder with great
care, as with a dense medium it's easy to overstress the parts while
lifting them out.

Not that it isn't a good idea -- maybe there's some material that would
work better than what I tried.


Bathsheba Grossman                 phone (831)429-8224, fax
Sculpting geometry
Solidscape prototyping
Protein crystals

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