SMW Autoblok AND Manual De Instrucciones página 20

machined one, it is necessary, to take up the clearance and deformation
of the chuck before grinding the soft top jaws. This is done by clamping
a ring (A) or a tool (B) in the same direction as the workpiece (internal or
external).
A) External clamping:
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B) Internal clamping:
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4.5 "T" NUTS.
4.5.1
Worn out or damaged T nuts must be replaced with original SMW-
AUTOBLOK components. The SMW AUTOBLOK guarantee is void if
non-original "T" nuts are used. The use of substitute components can
cause breakage in the chuck and/or in the clamping.
IMPORTANT. T-nut wear causes deformation in the master jaws
and an increase in the friction between the sliding surfaces. This can
cause seizure or breakage of the master jaws.
4.5.2 When attaching the top jaws to the master jaws, there must be at
least 2 mounting screws and the T nut must not protrude from the "T"
slot in the master jaw.
5. GREASING AND PERIODIC MAINTENANCE.
5.1 Greasing of the power chuck.
IMPORTANT: All operations and periodic maintenance MUST BE
TROUBLE SHOOTING GUIDE FOR POWER CHUCKS
20
INSTRUCTIONS AND SAFETY REGULATIONS
CONDUCTED WITH THE MACHINE OFF.
5.1.1 Periodic greasing of the power chuck is necessary to:
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A) Constantly achieve the calculated gripping force.
B) Guarantee long life and accuracy to the chuck.
5.1.2 Type of grease. Use special SMW-AUTOBLOK grease for power
chucks type K 05 or K 67. (K 05 recommended when working with
coolant and K 67 when working without coolant).
5.1.3 Frequency of greasing. The chuck should be greased every 500-
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1000 clamping/unclamping movements and in any case every 8-16
working hours.
5.1.4 How and where to grease the chuck. Use a hand pump on the
nipples of each master jaw and on those located radially on the body of
the chuck (if existing).
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Make movements of the jaws, during the greasing operation and after, in
order to distribute the grease into the chuck.
5.1.5 A few times a day move the chuck from fully opened to fully closed
without a workpiece. This allows a better distribution of the grease
within the chuck.
5.2 Periodic maintenance.
In order to properly maintain the chuck, it is necessary to dismount if
periodically, clean the chuck carefully, check the condition of the
contact surfaces and insure that the grease has penetrated uniformly.
5.2.1 Dismounting frequency:
A) A new chuck must be dismounted after 5,000 to 8,000 cycles;
B) then periodically, after 50,000-100,000 cycles;
C) at least every 6 months, regardless of the number of cycles.
5.2.2 What to do.
When the chuck is fully dismounted proceed as follows:
A) Degrease and clean each component with a trichloroethylene based
solvent.
B) Any residue can be cleaned with a wire brush.
C) Use a fine abrasive stone to eliminate any possible seizure marks.
D) The grease holes can be cleaned using a metal wire.
E) Inspect the chuck for excessive wear conditions that could cause a
loss of precision in the chuck or breakage.
EXCESSIVE WEAR DURING COMPONENT GRIPPING
PRODUCES CONCENTRATED STRESS AREAS THAT CAN
CAUSE PERMANENT DEFORMATION OR FAILURE IN THE
CHUCK'S COMPONENTS.