do release wax coatings not work? i am not making fuel grains but epoxy based
composite parts. i use teflon mandrels with a coat or two of paste wax. i will
buff the first coat of wax but not the second. someone said take care of
mandrells, listen to that person. cast grains or composite parts will grab on
to any surface irregularity and hold tight.
larry
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-------- Original message --------From: "Ray Rocket(Redacted sender
"ar0cketman" for DMARC)" <dmarc-noreply@xxxxxxxxxxxxx> Date: 10/8/18 22:42
(GMT-06:00) To: sugpro@xxxxxxxxxxxxx Subject: [sugpro] Re: Mandrel Removal?
On Mon, 10/8/18, Rick Maschek <dmarc-noreply@xxxxxxxxxxxxx> wrote:
<snip>
For
small 38/54 mm grains that I don't do much of, I use
latex rubber surgical tubing with a solid pin inside to help
it stay straight but loose inside the tubing. When the
propellant 'cures', I simply remove the solid pin
and pull on the latex tubing...it stretches and peels itself
off the propellant.
That's pretty much what I'm now working on, but using silicone rubber R/C fuel
line slipped over all-thread. I don't expect I will have this problem in the
future. A wide selection of silicone rubber tubing sizes are available,
Silicone rubber is widely used for candy molds, it should work for a mandrel
sleeve.
I've used PVA mold release for epoxy composite fabrication, surprised it
doesn't dissolve into the sugar since it's water soluble (and presumably sugar
soluble as well).
