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Upgraded rotary table is both strong and compact

Posted on 28 Jun 2019 and read 978 times
Upgraded rotary table is both strong and compactThe Japanese manufacturer Kitagawa, represented in Britain and Ireland by Salisbury-based 1st Machine Tool Accessories (www.1mta.com), has introduced the first in a new series of general-purpose rotary tables.

Designated MK200, it has a 200mm-diameter faceplate and a greater holding torque than the MR-series table that it supersedes.

It is also more compact, thereby minimising the loss of table area and working volume in a machining centre.

Moreover, this fourth axis reflects Kitagawa’s focus on constantly improving the standard of its tables in terms
of performance, mounting, and breadth of rotary-joint availability.

At 570Nm, the clamping torque of the MK200 is 40% greater than that of the MR200.

Additionally, the drive torque (at 270Nm) is said to be the highest in this class of unit, and the spindle through-hole diameter has been increased to 70mm (from 45mm).

Furthermore, because the faceplate can be specified with either T-slots or pre-drilled holes, a chuck, trunnion or other work-holding device can be mounted directly onto the rotary table’s spindle for optimum rigidity.

At 155mm from front to back, the depth of the new table is 10% less than that of the former MR version; together with recessed bolt mounting, this has allowed the footprint of the MK200 to be reduced by 40%.

The design also reduces the accumulation of chips around the base of the rotary table — an important consideration in automated production cells.

Furthermore, the MK200 accommodates built-in ‘6+1 port’ rotary joints, compared to only 4+1 for its predecessor.

If, for example, a trunnion arrangement is in use with one end powered by the rotary table, greater flexibility of hydraulic or pneumatic work-holding actuation is provided via the rotary joint housed within the large spindle bore.

This avoids wear and interference due to the presence of tubing if work-holding actuation is brought forward of the faceplate.

1st MTA can provide a high-pressure (25MPa) four-port or six-port rotary joint instead of the standard 7MPa variety. This allows a further reduction in fixtures sizes, as well as improved clamping speeds.

A video summarising the benefits of the MK200 can be seen at the Web site (www.yotube.com/watch?v =B3AZ2dSTv1Q).