This sounds exactly like what I've done before, when casting 2" nozzleless
motors. Now, I'm casting 60 gram motors (0.62") and there isn't as wide a
margin.
Silicone tubing will be stretched over the next mandrel, this should allow a
fairly easy removal. A cast silicone coating is planned for a future
generation of tooling.
Thanks everybody for your suggestions and recommendations, I'll doubtless try
them all over the next several grains.
--------------------------------------------
On Fri, 10/5/18, Steve Peterson <dmarc-noreply@xxxxxxxxxxxxx> wrote:
Subject: [sugpro] Re: Mandrel Removal?
To: sugpro@xxxxxxxxxxxxx
Date: Friday, October 5, 2018, 5:54 AM
I have found that the timing of
the removal is crucial, at least with
dextrose. Too early and the propellant slumps
a bit, of course, but too
late, and
they're a bear to remove. I use vegetable oil applied
with
fingers, then gently wiped off with
paper towel; leaves just the right
amount.
Mandrels are galvanized (bright) bolts with a long
unthreaded
section (threads are used with
nuts/washers for compression as the
propellant cools).
--Steve
On
10/04/2018 07:56 PM, Ray Rocket (Redacted sender ar0cketman
for
DMARC) wrote:
Notsure why, but the last few attempts at casting have resulted
release agents?
What are you guys using for mandrels and
