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I got a large piece of 1" fiberboard to use for mold making. I'm finding it very difficult to get a clean edge on this material Is ther a secret I dont know? I have already fired the pieces before i try to carve them is this proper or should I try it the other way? Any help will be appreciated :

Try carving before you burn them out. From my experience, they are less fragile and less prone to crumbling before they are fired. Also, use a really sharp exacto blade.

Lisa

I had the same problem. I am in the sewing business and we use a rotary knife alot. I used it on the fiber board and it worked outstanding. Here is a link:

http://shop.store.yahoo.com/cinemasuppl ... -6984.html

that's just the regular what I call rotary scissors for cutting fabrics?

I also received a hugh piece of board..never used it before. Would like to cut out a big ring (drop ring) to make a sink. Do I have to harden this and how do I go about it?

that's just the regular what I call rotary scissors for cutting fabrics?

That's exactly what it is. Cuts it like butter.

doctac wrote:I also received a hugh piece of board..never used it before. Would like to cut out a big ring (drop ring) to make a sink. Do I have to harden this and how do I go about it?

I simply cut it with a razor utility knife. It doesn't much matter what angle you cut to, square, beveled in or out. Prefire it and go. I generally use some dry powders on it to help seperate. I like alumina or plaster.

Bert

Bert, how long and how high to fire? Do I have to use hardener? before or after? Sorry for all the questions, just never used it before..Thanx

doctac wrote:Bert, how long and how high to fire? Do I have to use hardener? before or after? Sorry for all the questions, just never used it before..Thanx

I have never used hardner so I can't comment on how it works.

I recommend prefiring the board up to the top process temp you plan to use it at.

I've used a colloidal silica hardener on fiber batt, and applied it before firing. Worked well. Never used it on board.

i've used it on board. it works well. it's more solid and the edges don't flake off unless you bang it on the side of the kiln. damhikt

for rigidizing do a search in the archives for
fiber rigidizer
or fiberdizer
Anything with fiberdizer-n-go is good
Liam