Pete,
For plate frames I use 1/16th mild steel sheet. CRCQ [cold rolled
commercial pickled ] has a clean matt grey look and laser cuts well..for US
style bar frames hot rolled pickled sheet[ 4 mm thick] which can be laser
cut or milled out for one offs..dont try milling out
with cold rolled bar flat stock..when you come back the next day it will
have bowed as much as 2 or 3mm over 400mm lenght as stresses relieve..which
is very! irritating...
Gordon Watson.
