
CUTTING FIREBRICKS
The bricks are sized 4½"×2½"×9" so I decided
that assembling them in the shape of a nonagon
would give me the inside dimensions suitable
for the kind of work I do. I needed to compute
the angle to cut the bricks so that I could make a
10"-diameter forge as deep as a single course of
bricks, 9". The bricks are soft enough to cut with
a hand saw, but since I own a table saw I could set
the blade at the correct angle and the fence to the
correct width to cut them consistently.
Firebricks are pricey, and therefore I decided
to first model the cuts using some short 2×4s.
I ran each 2×4 through the saw twice, once for
each side. ...