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8. PREPARING THE WOOD LATHE
10. BASIC WOOD TURNING
10.4 KNOWING WHEN TO CUT AND WHEN TO
SCRAPE - FIG. 22
There are two different approaches to the work when
turning. The first is towards a circumference of the
workpiece (eg. When turning down the outer surface of a
cylinder or the inner wall of a hollow round box). Using
this method, the surface being turned travels under the
edge of the chisel like an endless belt. The second
approach is towards the diameter of the workpiece (as
when turning the face when faceplate turning, or the side
of a large shoulder when spindle turning) using this
method the surface being turned rotates like a disc under
the chisel edge. Some jobs will require both methods
being used.
Either a cutting or scraping action may be used when the
method used is towards the circumference – the shaving
will come off like the peel from a potato.
Only scraping can be used when the method used is
towards the diameter. The reason for this is obvious when
you consider that faceplate turning nearly always requires
the removal of wood across the grain. Wood does not
peel easily when turning across the grain and any attempt
made to use cutting methods will probably result in
damage to the workpiece and the chisel being thrown by
the workpiece.
It therefore follows that a cutting action is used for
general spindle turning operations, while the majority of
faceplate turning is carried out by the scraping method.
When both methods are to be used, you will have to
judge by the feel of the workpiece when to stop cutting
and start scraping. NEVER try to cut when it becomes
difficult to hold the chisel against the wood grain.
FIG.22
Diameter
Approach
Circumference
Approach
FIG.5
FIG.6
8.5 REMOVAL - FIGS. 5 - 6
When the need arises to remove the spurs, use the
ejection pin to push out the live centre from the
tailstock by inserting it down the centre of the tailstock
handwheel hole .
The drive spur is removed using the ejection pin and
the spindle holding wrench . Using the wrench to hold
the spindle on the flats, insert the ejection pin into the
hole in the side of the thread protection cap . Undo
the cap which will force the spur out of the spindle.
17
12
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