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INDEXING ACCURACY • REPEATABILITY
CLAMP TORQUE • ALLOWABLE WHEEL TORQUE
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             sudakoma is the world’s largest and leading
             manufacturer of NC Rotary Tables. This esteemed
             position of first and finest in the world of rotary table
manufacturing has been achieved through the dedication and design innovation of the Tsudakoma team.  When a rotary table is used in the manufacturing process, quite often that process involves making very precise, complicated parts and/or high volume production runs.  If a rotary table does
not perform as required, it is replaced by one that does. Tsudakoma rotary tables have been proven worldwide to
be the finest performing rotary tables available.  Please click on the above links for Tsudakoma technical information.

INDEXING ACCURACY

By indexing one rotation of the table equally to coincide with the tooth number of the worm gear
and measuring the result, the difference between the theoretical turning angle of the table and
actual measurement is obtained.  As shown below, the indexing accuracy is equal to the sum of
the maximum difference of the positive value and that of the negative value, as an absolute value.

REPEATABILITY

Indexing operations for positioning at four angular positions (0° 90° 180° and 270°) are
carried out five times for positive rotation, and the indexing angles are measured.  As a result,
the difference between the maximum and the minimum of the measurement at each angular
position is obtained. Indexing operations for positioning for negative rotation and the
measurement of the indexing angles are similarly carried out, and the difference between the
maximum and the minimum of the measurement is obtained. The repeatability is equal to the
maximum value of the difference obtained through both measurements.

CLAMP TORQUE

The stated clamp torque specifications cover only the clamping mechanism, and do not include
 self-locking caused by a worm gear. The clamp torque specifications listed in the catalog and on
this website are the figures obtained when the rated pressure (500 psi for hydraulic pressure,
and 72 psi for pneumatic pressure) is supplied to the working fluid. If a more powerful clamp
torque than specified in the catalog is required, the supply pressure can be elevated to the
maximum allowable pressure (711 psi for hydraulic pressure, and 100 psi for
pneumatic pressure), and the clamp torque can be proportionally increased.

ALLOWABLE WHEEL TORQUE

This allowable wheel torque is equal to the allowable torque for the worm wheel when the table
 rotation speed is 1 rpm. The allowable torque for the worm wheel is subject to the standard
stipulated by the Japan Gear Manufacturers Association.

SERVO MOTORS

FANUC Alpha type servo motors are specified for each model of NC Rotary Table. The table below shows
other servo motors, which are classified according to the category of FANUC Alpha motor capacity.