Duff-Norton Ball Screw Translating - Manual (Page 4)

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4. The ball screw actuators should have a greater
raise than is needed in the actual installation.
Should it be necessary to operate the actuators
to the extreme limits of travel, it should be done
cautiously.
Caution
Do not allow actuator travel to go beyond cata-
log closed height of actuator or serious damage
to internal actuator mechanism may result. Refer
to table of specifications (par. 1.3) for closed
height of respective units.
5. The worm shaft speed for these actuators
should not exceed 900 RPM for heavy loads, or
1800 RPM for light loads of one-fourth (or less)
of the actuator capacity.
6. The lifting screw should not be permitted to
accumulate dust and grit on the threads. If
possible, lifting screws should be returned to
closed position when not in use.
7. The ball screw should be checked periodically
for excessive backlash and spalling of race
ways.
8. The lubrication procedures for normal and
severe service conditions, as described in
Section II, paragraph 2-1, should be closely
followed.
9. Due to high efficiency of Ball Screw actuators, a
brake must be used in conjunction with motor
selected to position actuator (refer to current
catalog for brake selection data).
1-5. Warranty and Warranty Repair
Subject to the conditions stated herein, Duff-
Norton will repair or replace, without charge, any
parts proven to Duff-Norton’s satisfaction to have
been defective in material or workmanship. Claims
must be made within one year after date of ship-
ment. Duff-Norton will not repair or replace any
parts that become inoperative because of improper
maintenance, eccentric loading, overloading, chemi-
cal or abrasive action excessive heat, or other
abuse
Equipment and accessories not of Duff-Norton’s
manufacture are warranted only to the extent that
they are warranted by the manufacturer, and only if
the claimed defect arose during normal use, appli-
cations and service. Equipment which has been
altered or modified by anyone without Duff-Norton’s
authorization is not warranted by Duff-Norton.
EXCEPT AS STATED HEREIN, DUFF-NORTON
MAKES NO OTHER WARRANTIES, EXPRESS OR
IMPLIED, INCLUDING WARRANTIES OF MER-
CHANTABILITY AND FITNESS FOR A PARTICU-
LAR PURPOSE.
If you have any questions concerning warranty
repair, please contact Customer Service for the
name and address of your nearest Duff-Norton
warranty repair facility.
Authorization for return must be received from
Duff-Norton before returning any equipment for
inspection or warranty repair.
Section II
Maintenance
2-1. Lubrication
Unless otherwise specified, actuators are
shipped packed with grease which should be suffi-
cient for one month of normal operation. For normal
operation the actuator should be lubricated once a
month, using Extreme Pressure grease Shell Oil
Co. Shell Albida LC EP #2, (Shell Product Code 70311).
This grease has been thoroughly evaluated in
Duff-Norton actuators and has demonstrated supe-
rior lubricating properties affecting both wear life
and maximum duty cycle. Duff-Norton is not aware
of an equivalent grease. If this grease is not
available in your area please contact your local
supplier for their recommendations. Greases con-
taining molybdenum disulfide should never be used.
For severe service conditions, the actuators
should be lubricated more frequently (daily to
weekly depending on conditions). If duty is heavy,
an automatic lubrication system is strongly recom-
mended.
Lubricate periodically the exposed ball screw
grooves with a cloth dampened with a good grade
10W30 oil for most applications. An instrument
grade oil should be used in dirty and heavy dust
environments, while bearing grease is recom-
mended for operating environments at extremely
high temperatures. Extremes of temperature and
other environmental conditions should be referred to
Duff-Norton for recommended lubrication procedures.
Caution
Where the screw is not protected from airborne
dirt, dust, etc., do not leave a heavy film of lubricant
on the screw. Keep the ball screw barely damp with
the lubricant. Inspect at regular intervals to be
certain a lubricating film is present. Ball screws
should never be run dry.