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BASIC WOODTURNING
POSITIONING CHISEL AND TOOL REST
FOR DIAMETER SCRAPING
When diameter scraping, the area to the right
of the centre is moving upward (
Fig.34
). If the
chisel is placed 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 (
Fig.35
). 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 3mm below the centre.
USING THE GOUGE CHISEL
Three gouges 6, 12, 18mm sizes are usually
sufficient for home workshop turning, but
other sizes are available (refer to 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 30° to 45° in the
direction in which it is being advanced along
the rest, the cutting edge would be a little in
advance of the handle,
Figs. 36
&
37
.
Fig.34.
Fig.35.
Fig.36.
Fig.37.
TOOL REST
TOOL REST
CUTTING
EDGE
ADVANCED
WRONG
CORRECT
