In the past, we had parts aluminum sand cast using patterns hand shaped from mdf and bondo.
I now want to move to cnc'ing the patterns out of some type of foam. What foam should I use? Name brands? Types? I am totally new to foams.
I would like the foam to be as "light" as possible so that I can run the cnc faster than with "heavy" foam. However, I presume that the foam needs to be heavy/stiff enough so that when the foundry is pressing the pattern into the sand that the foam does not compress or break.
If you know of good foam suppliers for this kind of stuff in the Southern California are, please feel free to recommend them.
Thanks!