| JACK, LEVELING | Small jacks (usually screw jacks) for
leveling and holding work on planner beds and
similar places.
|
| JACOBS CHUCK | Common term for the drill chuck
used in either the headstock spindle or in the tailstock
for holding straight-shank drills, taps, reamers, or
small diameter workplaces.
|
| JCL | Job
control
programme
|
| JIG | In manual machining, a jig is used to hold the workpiece and also to guide the tool.
|
| JOB | An
amount
of
work
to
be
completed.
|
| JOG | A
control
function
which
provides
for
the
momentary
operation
of
a
drive
for
the
purpose
of
accomplishing
a
snail
movement
of
the
driven
machine
|
| JOG FEED | Manually feeding a specified controlled axis at a specified feedrate.
|
| JOG FEEDRATE OVERRIDE | Manual control in which the operator can change the jog feedrate.
|
| JOHANNSON BLOCKS (JO BLOCKS) | Common term for
the precision gage blocks used and accepted as
dimensional standards by machinists, toolmakers. and
inspectors
|