Table of Contents
Advertisement
STEADY
1
(_ 0/F5 RCE
THRUST
_,'_
AGAINST
/i
_Bev_ e t
HAedDS
ain
Jor.._
Chise!
cutting
properly.
2
No support
,_j,
for
CHATTER
G /_
bevel'
•
/ /
pofnt
t
OO
'digging
in.
Rest too low;
chisel too horizontal.
3
_!_Rest
4
Rest too
_,0_
high-
KICKBACK
_
mmw_m
_
chisel
/// too high
HANDLE
(_
KICKED U_
Rest too distant -
chisel too high,
point too far from
rest.
7
If the rest is placed too low, so that the chise!
is held with
the
bevel
out from
the work
(sketch
2}, the cutting
edge
will
continue
to dig deeper
into the work.
It will dig in until
the
"'bite"
becomes
so deep
that
your
hands
have
difficulty
holding
the chisel -- then the improperly
supported
chisel
will begin
to bounce,
or chatter,
against
the workplace.
If the
rest
is placed
too
tow,
the
chisel
must
be held
extremely
high
to position
the
bevel
against
the
work
(sketch 3). Then the rest loses most
of its value as a fulcrum,
and the downward
force of the revolving
workplace
tends to
kick the chisel
back out of your
hands.
If the rest is placed
too high
(sketch
4) and the chisel
is
correctly
positioned
for cutting,
it strikes
the workpiece
near
the top where
the direction
of force
exerted
by the
workpiece
is nearly
horizontal
--
and kickback
will again
result.
If the rest is placed too far out from
the work surface
(sketch
5}--
then, when correctly
heid,
the chisel
is again too high
on the work. Also, you have less leverage
on your side of the
tool rest -- and it is even more
difficult
to hold the chisel
With
large diameter
work (sketch
6), the tool rest can be
above
the workpiece
centertine,
and somewhat
out from
the work surface.
With
small
d_ameter
work (sketch
7), the
rest should
be lowered
almost
to the centeHine,
and shoutd
not be far from the work
surface.
As work
grows
smafler,
the rest should
be repositioned.
How
to Position
Toot Rest
for
CircumferenCe
Scraping
In scraping
operations,
the too_ rest posit{on
is not as critica!
as it is for cutting
operation,
s. The chisel
generally
is held
horizontally,
though
it can be he_d_ at an _ngfe to reach
into
tight
places.
Considering
that
the wife
edge of the ehisef
8
/
CORRECT
9 /
yo
/
DIGGING /
/
STOCK
\
REMOVE
D
\\
does the scraping,
sketches
9 and 10 show
the results
of too
!ow or too high a position
for the rest;
and sketch
8 shows
the chisel
action
with
the rest correctly
positioned.
How to Position
Chisel and Rest for Diameter
Scraping
When
scraping
on the diameter,
that port,on
of surface
to
the right
of center
is moving
upward
(sketch
1 t ) If chisel
is
placed
in this area,
it will simply
be carried
up off the rest
and out of your
hands
All diameter
approach
operations
must
be done at the taft of center
.....
Ti '"i ....
"' i
......
/
;.........
!,
.L
.
..................................
i...........
/
_
'x,\
_
///
REST"t ..........
.......1 1
12
.__
Throe
different
chisel
contact
po*nts
are shown
in sketch
! 2. it will be noted that,
when chise!
is above the workpiece
center,
or be_ow it, the work
surface
sweeps
past the ch iset
edge
at an angle
and
tends
to carry
the chisel
JR orle
direction
or the other along
the rest.
Orfly when
the chisel
contacts
the work
or_ the centerfine
does the work surface
pass
squarely
under
the
chisel
edge.
This,
then,
is the
position
in which
it is easiest
to hold the chise_ steady.
To
obtain
this position,
place the res_ appr'oximate}y
I/8.
inch
{thickness
o{ chise!)
below
centel.
USING
THE GOUGE
"}"hroe gouges,
the t/4.
I/2-
_nd 3/4-in
sizes, are ampie
for general
homeshop
turning;
but ether srzes from I iS- to
2-in
can be purchased
The
chief
use of the gouge
is for
rough
circumference
cutting
of raw stock down to a cylinder
of working
size
it ts
the best too_ ,_ouse for r_pid
cutting
away
of _arge a_eas of
the
workpiece;
but
when
so used
does
not produce
a
smooth
surface
With
practice,
it can be used for cutting
coves
and the shaping
of _ong cuts
---- i s also usefui
fo_
scraping.
_7
Hide quick links:
Advertisement
Table of Contents
