USING WOODWORKING CHISELS:
Professional woodturning chisels have handles approximately 10
″
long. This provides the operator with
good grip and leverage. A sharp chisel will be much easier to work with and will give the job a cleaner
finish. Fig.30 shows the six most commonly used types of turning chisel.
WOODTURNING OPERATIONS cont’d
THE THEORY OF TURNING:
There are two types of turning chisel. These are:
1) those intended primarily for cutting,
2) those used only for scraping.
The cutting chisels are the gouge, skew and parting type. These are sharpened to a razor edge by honing
on both sides.
The scraping chisels are the flat nose, round nose and spear point. These are not hones on the flat sides –
the wire edges produced by scraping are left on to aid in the scraping process. Fig.31. shows the two types
of chisel.
CUTTING AND SCRAPING:
To make a cut, the chisel should be held so that the
sharp edge actually digs into the revolving
workpiece, shavings should now peel off. To scrape,
the chisel should be held at a right angle to the
surface of the workpiece, fine pieces of wood will be
produced when scraping instead of shavings. See
Fig.32.
Many operations require the cutting chisel to be used
for scraping but scraping chisels are very rarely used
for cutting. Scraping will blunt/dull a chisel much
faster especially when using razor sharp cutting
chisels.
Cutting is much faster then scraping and produces a
much smoother finish. Cutting is more difficult than
scraping, but scraping is more precise and easier to
control.
- 15-
Fig.30.
GOUGE
CUTTING CHISEL SCRAPING CHISEL
SKEW
PARTING
TOOL
SPEAR
POINT
FLAT
NOSE
ROUND
NOSE
Fig.31.
Fig.32.
CUTTING SCRAPING
