4TH Axis Rotary Table with Servo Motor for Coordinated Indexing MG-400

That table is what we call a 4th axis. It rotates the part while the milling machine works, allowing you to make slots, holes and profiles at programmed angles, without removing the part from the setup. The MG-400 has a 27.6-inch (700 mm) table and an 8.1 lb-ft (11 Nm) servo motor, controlled via PLC. It is used in coordinated machining where the rotation needs to be synchronized with the other machine axes.

The MG-400 has an 8.1 lb-ft (11 Nm) servo motor, which provides enough force to rotate heavily loaded parts without losing position. The table has a 27.6-inch (700 mm) diameter, with 8 T-slots for clamping fixtures and workpieces. Positioning is controlled via PLC, with rotation programmed in coordinates. It also comes with an included hydraulic unit to lock the axis in the exact position after each rotation.

The 27.6-inch (700 mm) table on the MG-400 accepts fixtures and parts clamped in the 8 T-slots distributed across the surface. It works well with chucks, steady rests, or any standard milling fixture that fits within the diameter. It is designed for parts that require coordinated rotation during machining, such as flanges, cylindrical bodies, shafts and components with angular profiles. Check with Chinelatto to confirm compatibility with your specific setup.

On a manual indexing table, the operator rotates and locks the part by hand, one angle at a time. Any positioning error ends up in the part. The MG-400, however, uses an 8.1 lb-ft (11 Nm) servo motor with PLC control, so the rotation is programmed and repeated precisely across the entire batch. The hydraulic unit also locks the axis automatically after each rotation, eliminating backlash. For anyone running production runs or needing angular repeatability, the difference in results is significant.

The PLC receives the machining program with the defined angles and rotation sequence. When it is time to rotate, the MG-400 servo motor executes the movement precisely, positioning the part at the correct angle. After the rotation, the hydraulic unit activates the positioning lock, holding the axis firm while the tool works. This cycle repeats for each programmed position, without operator intervention. The result is repeatable angular machining across a production run.

The hydraulic unit on the MG-400 requires periodic checks of the hydraulic oil level and condition. Degraded oil loses viscosity and reduces clamping force, compromising positioning accuracy. You should also check hoses and fittings for leaks and keep the filter clean. The servo motor needs less mechanical maintenance since it has no brushes, but the electrical connectors should be inspected regularly. Contact Chinelatto for the specific preventive maintenance schedule for the MG-400 model based on your application.

The MG-400 is quoted on demand, and pricing varies with each customer's needs, including accessories, tooling and optional features. With in-house technology developed by Chinelatto in Brazil since 1962, you can count on responsive support from our technical team. Spare parts: many are kept in stock and the others are manufactured within a reasonable lead time. Request a quote at chinelatto.com.br/contact — our sales team will contact you very soon.