Thanks Edward, great stuff!
On 18 January 2017 at 16:30, Edward Wranosky <edwardcw@xxxxxxxxx> wrote:
I use 2# EPS foam. It is cut with a hot wire cutter to the correct shape.
Edward
On Wed, Jan 18, 2017 at 8:22 AM, James Padfield <james.padfield@xxxxxxxxx>
wrote:
Thank you, that is really interesting. Sorry, just one more question
if I may - what type of foam do you use for the mandrels? I assume
you machine the foam mandrels to the desired shape?
On 18 January 2017 at 16:03, Edward Wranosky <edwardcw@xxxxxxxxx> wrote:
The pot life is ~30 minutes with this, I would estimate. At least 15
minutes is spent mixing and under vacuum and then pouring it in the
grain
casting assembly. The grain is tack less to the touch after 12 hours,
and
after 24 hours it is cured enough to to any post machining to the grain
that
is needed. The grains are cured at ambient (~68-72F). I don't remove
any
mandrels, I use foam ones that can be removed with acetone. This allows
more complex shapes.
Edward
