24
Forward/
backward
Forwar
d/
backwar
d
Up/down
Up/
down
Up/down
Dial test indicator
Dial indicator
Stroke
Forward/
backward
Machining
point
Cutting tool
Table
L
Linear Scale
Motion of table
Checking parallelism
Use a dial indicator as shown in the figure below. To adjust the parallelism
between the scale unit and the machine guide, check the parallelism while
manually moving the machine's movable part such as the slide table, or
measure the parallelism with reference to the guideways of the machine or
equivalent reference surface.
s¬0ARALLELISM¬TOLERANCE¬2EFER¬TO¬
each figure on dimensions.
s¬# HECKING¬DIRECTION¬
"ACKFORWARD¬DIRECTION¬
on mounting surface and
directions along mounting
surface (up and down).
s¬# HECKING¬POSITION¬0OSITION¬
of scale unit around the
mounting blocks.
Precautions when mounting and handling Linear
Scales
Selecting the scale unit mounting position
and mounting method
It is important to keep in mind the following four points when determining
the scale unit mounting position and orientation.
Ease of mounting
Mount the scale unit making sure that the unit including the detector head
and the cables does not interfere with any part of the machine. To facilitate
mounting, mount the scale unit and the brackets on machined surfaces
wherever possible.
Protection from machining fluids and swarf
(mounting orientation)
4HE¬SCALE¬UNIT¬IS¬CONSTRUCTED¬IN¬SUCH¬A¬WAY¬THAT¬MACHINING¬mUIDS¬AND¬
swarf cannot easily enter into the interior of the unit. However, since the
openings are protected from entry of foreign material with rubber seals only,
AVOID¬DIRECTLY¬EXPOSING¬THE¬SCALE¬UNIT¬TO¬MACHINING¬mUIDS¬AND¬SWARF¬3ELECT¬
the mounting orientation of the scale unit after carefully considering the
DIRECTION¬IN¬WHICH¬MACHINING¬mUIDS¬AND¬SWARF¬ARE¬SPRAYED¬AND¬SCATTERED
Accuracy considerations
The total system accuracy of the machine on which the scale unit is mounted
is not only determined by the scale unit accuracy but by the machine
accuracy as well. Particularly for machines with slide tables, geometrical
errors may occur, depending on the straightness of moving parts; Thus, the
scale unit must be mounted in a way that these errors are minimized. If the
slide table moves not linearly but curvilinearly, errors occur in proportion to
THE¬DISTANCE¬ , ¬BETWEEN¬THE¬SCALE¬UNIT¬AND¬THE¬MACHINING¬POINT¬CUTTER¬
POSITION ¬4HUS¬MOUNT¬THE¬SCALE¬UNIT¬IN¬A¬POSITION¬THAT¬MINIMIZES¬ ,
.
Adjusting parallelism
Adjust the parallelism to within 0.2mm. Spacers used in adjustment are not
included in the accessories.
s¬!DJUSTING¬THE¬MOUNTING¬SURFACE¬BACKFORWARD¬2EADJUST¬THE¬MOUNTING¬
positions of the brackets or place spacers
between the scale unit mounting surface
and the mounting blocks.
s¬!DJUSTING¬ALONG¬UP¬AND¬DOWN ¬THE¬
MOUNTING¬SURFACE¬!DJUST¬THE¬PARALLELISM¬
by sliding the mounting block on the
mounting surface.
Other considerations
s¬)F¬THE¬DETECTOR¬HEAD¬MOVES¬THE¬SIGNAL¬CABLES¬ALSO¬MOVE¬WITH¬THE¬SLIDE¬
table. This should be considered when laying out the signal cables. It is
therefore recommended to mount the scale unit on the moving part of the
machine.
s¬-OUNT¬THE¬SCALE¬UNIT¬IN¬PLACE¬WHERE¬IT¬IS¬NOT¬DIRECTLY¬SUBJECTED¬TO¬AIRmOW¬
7HEN¬REMOVING¬SWARF¬USING¬AN¬AIR¬GUN¬BE¬CAREFUL¬OF¬mYING¬SWARF
s¬4HE¬SCALE¬UNIT¬MUST¬BE¬MOUNTED¬IN¬A¬PLACE¬WHERE¬MAINTENANCE¬CAN¬BE¬
easily performed in case unit trouble occurs.
③
②
①
⑤
⑥
Scale
Air dryer
④
⑦
Air pressurization improves environmental
resistance
The resistance to dust and oil penetration of assembly-type linear scales can
be improved by pressurizing the unit with clean air. Supply air into the pipe
INSERTED¬IN¬EITHER¬SCREW¬HOLES¬- ¬ON¬BOTH¬SIDES¬OF¬THE¬SCALE¬UNIT
¬/F¬THE¬LINEAR¬SCALES¬DESCRIBED¬IN¬THIS¬CATALOG¬THE¬!4¬SERIES¬ONLY¬SUPPORTS¬AIR¬SUPPLY¬
The method of supplying compressed air to the scale unit is provided as one
means of improving the environmental resistance (resistance to coolant and
dust) of linear scales.
Supply air observing the following specifications.
¬ !IR¬PRESSURE¬SUPPLIED¬TO¬THE¬SCALE¬-0¬APPROX¬KGFCM
2
)
The air pressure supplied to the scale is to be that indicated by a pressure
gage as shown in the diagram below at position
⑦
.
Adjust supplied air to the above pressure with the regulator.
¬ !IR¬mOW¬RATE¬¬TO¬ ¬)MIN¬PER¬AXIS
)-0/24!.4¬4HIS¬mOW¬RATE¬IS¬EQUIVALENT¬TO¬THE¬EXTENT¬THAT¬AIR¬IS¬SLIGHTLY¬
expelled from the slit aperture of the dust-proof rubber.
!DJUST¬SUPPLIED¬AIR¬TO¬THE¬ABOVE¬mOW¬RATE¬WITH¬THE¬mOW¬REGULATING¬VALVE¬
3. Used air
Do not supply air directly from the compressor, but always use
COMPRESSED¬AIR¬AFTER¬DRYING¬THROUGH¬AN¬AIR¬DRYER¬"E¬SURE¬TO¬INSTALL¬AN¬AIR¬
filter, etc., based on the following diagram.
Checking parallelism
and adjustment of scale unit
In order to attain maximum accuracy, the scale unit must be mounted
parallel to the machine guide (machining axis). Incorrect mounting may
cause the scale unit to bend or twist.