Jigs
and
Fixtures
Mass production methods demand a fast and easy method of positioning work for accurate operations on it.
Jigs
and
fixtures are
production
tools
used
to
accurately
manufacture
duplicate
and
interchangeable
parts.
Jigs
and
fixtures
are
specially
designed
so
that
large
numbers
of
components
can
be
machined
or
assembled
identically,
and
to
ensure
interchangeability
of
components.
The
economical
production
of
engineering
components
is
greatly
facilitated
by
the
provision
of
jigs
and
fixtures.
The
use
of
a
jig
or
fixture
makes a
fairly
simple
operation
out
of
one
which
would
otherwise
require
a
lot
of
skill
and
time.
Both
jigs
and
fixtures
position
components
accurately;
and
hold
components
rigid
and
prevent
movement
during
working
in
order
to
impart
greater
productivity
and
part
accuracy.
Jigs
and
fixtures
hold
or
grip
a
work
piece
in
the
predetermined
manner
of
firmness
and
location,
to
perform
on
the
work
piece
a
manufacturing
operation.
A
jig
or
fixture
is
designed
and
built
to
hold,
support
and
locate
every
component
(part)
to
ensure
that
each
is
drilled
or
machined
within
the
specified
limits.
The
correct
relationship
and
alignment
between
the
tool
and
the
work
piece
is
maintained.
Jigs
and
fixtures
may
be
large
(air
plane
fuselages
are
built
on
picture
frame
fixtures)
or
very
small
(as
in
watch
making).
Their
use
is
limited
only
by
job
requirements
and
the
imagination
of
the
designer.
The
jigs
and
fixtures
must.
be
accurately
made
and
the
material
used
must'
be
able
to
withstand
wear
and
the
operational
(cutting)
forces
experienced
during
metal
cutting
Jigs
and
fixtures must
be
clean,
undamaged
and
free
from
swarf
and
grit
Components
must
not
be
forced
into
a
jig
or
fixture.
Jigs
and
fixtures are
precision
tools.
They
are
expensive
to
produce
because
they
are
made
to
fine
limits
from
materials
with
good
resistance
to
wear.
They
must
be
properly
stored
or
isolated
to
prevent
accidental
damage,
and
they
must
be
numbered
for
identification
for
future
use.
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