WOODTURNING OPERATIONS cont’d
POSITIONING THE TOOL REST FOR
DIAMETER SCRAPING:
When diameter scraping, the area to the right of the
centre is moving upward. (See Fig.44). If the chisel is
laced in this area it will simply be carried up and off
the tool rest, possibly out of your hands. So all
diameter approach operations MUST be done at the
left of the centre.
Three different chisel contact points are shown in
Fig.45. Note that when the chisel is positioned above
or below the workpiece centre, the work surface
sweeps past the chisel edge at an angle and will tend
to carry the chisel in one direction along the tool
rest.
Only when the chisel contacts the workpiece centre
line does the workpiece pass squarely under the
edge of the chisel. This then is the position in which it
is easiest to hold the chisel steady. To obtain the
position place the rest approximately
1
⁄
8
″
below the
centre.
USING A GOUGE CHISEL:
Three gouges –
1
⁄
4
″
,
1
⁄
2
″
and
3
⁄
4
″
sizes are usually
sufficient for home workshop turning, but other sizes
are available (refer to the Draper Catalogue). A
gouge chisel is normally used for rough
circumference turning or turning raw stock down to a
cylinder of workable size. It is best used for rapid
removal of the workpiece, but will not produce such
a smooth finish, but with practice it can be used for
cutting coves, for shaping long cuts and is also useful
for scraping.
When used for cutting, the gouge is always held with
the convex side down and should be rolled
approximately 30º to 45º in the direction in which it is
being advanced along the rest, the cutting edge
would be a little in advance of the handle, see Figs.
46 and 47.
- 19-
Fig.44.
Fig.45.
Fig.46.
Fig.47.
TOOL REST
TOOL REST
CUTTING EDGE
ADVANCED
WRONG
RIGHT
