TOOLS USED IN MODEL ENGINE-MAKING. 15
diameter) with a graver or steel chisel, and, finished with a fine and oil, or emery cloth and oil, while still revolving in the lathe.
file
or
oil,
is
chucked,
chisel
After the metal is chucked, it is first "roughed down" with a graver to the required form;
first
it is
third, polished with emery
cloth and oil, and then removed from the lathe.
Fig.9 Be careful always when turning to use well-
sharpened chisels;
oil,
graver to the required form; second,
smoothed with a
emery cloth and
revolving in the lathe.
cloth and oil,
necessary to keep a good edge upon them. Chisels are of various shapes: some have a flat edge, others are bevelled, and others again taper to a sharp point at one end.
Of the last variety, it is best to have a right, and left-hand tool. Chisels
should be made of good square cast steel; old files
