From: Rob Connelly (flpinc@nc.rr.com)
Date: Thu Jan 30 2003 - 05:27:21 EET
Paul,
You're absolutely right! I have used isopropyl to dissolve the Sanders part material in the past, and I forgot all about it. I gotta quit sniffing the solvents ;-) The Sanders process has every bit of the resolution that is needed to do the parts as well. Great solution, Paul, and all the others who had the same idea. Thanks. And tell the rest of the gang there that I said hello.
I will summarize the other responses that I received as well. They were all excellent -- thanks to you all for the help.
- Use an acid to "digest" the part rather than dissolve it.
- Use a combination of hot water and isopropyl to soften, then dissolve the part.
- Use a low-temp (250 C) burnout.
- Make a tool, then mold wax parts or other mat'l (geometry won't allow, unfortunately)
- Use flouride gas to eat it away.
Boy I tell ya, a little SL part doesn't stand a chance around you guys!!
- Rob
----- Original Message -----
From: Paul Suomala
To: James McMurray
Cc: Rob Connelly ; RP-ML
Sent: Sunday, January 26, 2003 9:10 AM
Subject: Re: Dissolving SL Resin?
James,
The "Sanders" green material goes to liquid state at 95 Deg C.
It is attacked (at room temperature) very rapidly by acetone (isopropyl alcohol works but is a little slower). If evacuation must be completed at room temperature, either of these would remove all the green material with adequate flushing.
Autoclaving is an alternative if that is an acceptable temperature. However,
I presume the investment substitute displays unacceptable behavior at elevated temperatures or Rob would not be so specific about that requirement.
Rob - does the project HAVE to be made from SLA material? If so, I should think the material providers know what destroys their material(s).
best regards,
Paul S
James McMurray wrote:
Rob, Even though the Sanders support wax will dissolve at 60 deg. C in BioAct the build material needs a much higher temp. and then it doesn't really dissolve it melts into a floating goo that sticks to itself and any strainers in the bath. I would talk to the Solid-Scape folks and find out what it will dissolve in, and at what temperature. Chances are it will dissolve in an easy to obtain solvent. Then the problem becomes does the solvent breakdown the mold material.You might try to see if the customer can allow steam dewaxing. That might clean out the mold well enough and not ruin it for his purposes. Regards,James
----- Original Message -----
From: Stanley Lechtzin
To: Rob Connelly
Cc: RP-ML
Sent: Friday, January 24, 2003 8:36 PM
Subject: Re: Dissolving SL Resin?
Hi Rob -
How about using the Sanders process? The support wax used in this process will dissolve at approx. 60 deg. C. using BioAct as a solvent.
Cheers,
- Stanley
At 08:48 PM 1/23/2003 -0500, Rob Connelly wrote:
Hello RP'ers,
I have a resin question for the group. I have a customer who wants to make some tiny little parts on a high-res SL machine for a medical application. Trouble is, he needs the parts for a process similar to investment casting wherein he will shell them with something, and then dissolve the SL part back out of the shell. He can't use high temperatures as in investment casting -- he needs to use a solvent.
So, is anyone aware of a resin that can be used in a high-res SL machine (either a Viper or a 250HR) that can dissolve in acetone, xylene, MEK, or other such nasty chemical? Do the old acrylates dissolve? My customer has told me that just softening or deteriorating is not good enough -- it has to dissolve. If this does exist, do you know of a vendor who has this combination to whom I can outsource the job?
Thanks in advance for your time,
Rob Connelly
FineLine Prototyping, Inc.
6300 Limousine DR
Suite 130
Raleigh, NC 27613
919-781-7702
rob@finelineprototyping.com
Prof. Stanley Lechtzin
Temple University
Tyler School of Art
Metals/Jewelry/CAD-CAM
7725 Penrose Ave.
Elkins Park, PA 19027
phone: 215-782-2863
fax: 215-635-2861
email: stanley@comcast.net
stanlech@temple.edu
http://www.temple.edu/crafts
M/J/C-C web site
http://listserv.temple.edu/archives/acmet-l.html
ACMET-Listserv
http://oll.temple.edu/crafts233_public/
Online CAD/CAM I Course
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