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6.4 MECHANICAL CONNECTIONS
6.4.1 ELECTRO-SPINDLE SUPPORT PLANE
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THE SUPPORTING PLANE ON WHICH THE ELECTRO-SPINDLE IS INSTALLED MUST
HAVE A PLANARITY RATING EQUAL TO OR BETTER THAN 0.025MM
6.4.2 FIXING THE ELECTRO-SPINDLE
The electro-spindle must be fixed to the machine carriage or support
by means of bolts. Maximum penetration of bolts from the support
plate is shown in the overall dimension drawings. (See data sheet)
Figure 6.1 alongside shows an example of electro-spindle fixing
holes with permitted bolt penetration dimensions.
The fixing holes on some electro-spindles are through holes,
because of the limited thickness of the body. To prevent dust and dirt
from entering the unit, these holes are closed off with plastic plugs.
These must be removed before the unit can be installed in the
machine. These units are also fitted with a plate informing the
installer of the maximum allowable bolt penetration depth. (See the
example in Figure 6.2)
Figure 6.1
Figure 6.2
EXCESSIVE BOLT PENETRATION CAN CAUSE DEFORMATION OF THE ELECTRO-SPINDLE’S BODY, AND MECHANICAL OR
ELECTRICAL DAMAGE THAT CAN LEAD TO SPINDLE MALFUNCTIONING.
FIXING BOLTS MUST BE TIGHTENED WITH A TORQUE WRENCH.
IT IS VERY IMPORTANT TO RESPECT THE TIGHTENING TORQUE SPECIFICATION, SPECIALLY WHEN INSTALLING
ELECTRO-SPINDLES ON WHICH ONLY A LIMITED LENGTH OF BOLT CAN BE SCREWED INTO THE FIXING HOLES. FIXING
BOLT TIGHTENING TORQUE MUST BE DETERMINED BY THE CUSTOMER ON THE BASIS OF ELECTRO-SPINDLE TESTS IN
THE MACHINE IN WHICH IT IS TO BE INSTALLED.
EFFECTIVE TIGHTENING TORQUE CAN VARY SIGNIFICANTLY UNDER THE EFFECT OF FRICTION, THE PRESENCE OF
GREASE, AND THE SPEED AT WHICH TIGHTENING IS DONE.
TIGHTENING TORQUE MUST BE DETERMINED TO SUIT THE APPLICATION TO WHICH THE ELECTRO-SPINDLE IS TO BE
PUT.
WHILE FIXING THE UNIT IN PLACE, TAKE CARE NOT TO BLOCK OFF THE COOLING FAN GRILL OR OTHERWISE IMPEDE
THE FLOW OF COOLING AIR. ALWAYS LEAVE THE MINIMUM GAP AROUND THE UNIT SPECIFIED IN THE OVERALL
DIMENSION DRAWINGS. (SEE DATA SHEET.)
6.5 ELECTRICAL CONNECTIONS
(see data sheet)
ALWAYS USE POWER CABLE OF ADEQUATE CROSS SECTION FOR THE RATED CURRENT OF THE ELECTRIC MOTOR.
(SEE DATA SHEET)
NEVER FIT OR REMOVE CONNECTORS WITH THE ELECTRO-SPINDLE POWERED ON.
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